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CSC - Chandra Source Catalog, v1.1

HEASARC
Archive

Overview

The Chandra Source Catalog (CSC) is a general purpose virtual X-ray astrophysics facility that provides access to a carefully selected set of generally useful quantities for individual X-ray sources, and is designed to satisfy the needs of a broad-based group of scientists, including those who may be less familiar with astronomical data analysis in the X-ray regime. The first release of the CSC included information about 94,676 distinct X-ray sources detected in a subset of public Advanced CCD Imaging Spectrometer imaging observations from roughly the first eight years of the Chandra mission. This release of the catalog included point and compact sources with observed spatial extents <~30 arcseconds. The catalog (1) provides access to the best estimates of the X-ray source properties for detected sources, with good scientific fidelity, and directly supports scientific analysis using the individual source data; (2) facilitates analysis of a wide range of statistical properties for classes of X-ray sources; and (3) provides efficient access to calibrated observational data and ancillary data products for individual X-ray sources, so that users can perform detailed further analysis using existing tools. The catalog includes real X-ray sources detected with flux estimates that are at least 3 times their estimated 1-sigma uncertainties in at least one energy band, while maintaining the number of spurious sources at a level of <~ 1 false source per field for a 100 ks observation. For each detected source, the CSC provides commonly tabulated quantities, including source position, extent, multi-band fluxes, hardness ratios, and variability statistics, derived from the observations in which the source is detected. In addition to these traditional catalog elements, for each X-ray source an extensive set of file-based data products that can be manipulated interactively, including source images, event lists, light curves, and spectra from each observation in which a source is detected, are available from the CSC realization at the Chandra X-ray Center at http://cxc.harvard.edu/csc/.

The energy bands used to derive many of the CSC properties are defined in Table 4 of the reference paper: ultrasoft (u: 0.2-0.5 keV), soft (s: 0.5-1.2 keV), medium (m: 1.2-2.0 keV), hard (h: 2.0-7.0) and broad (b: 0.5-7.0 keV) for the ACIS energy bands, and wide (w: 0.1-10.0 keV) for the HRC energy band. The energy bands are chosen to optimize the detectability of X-ray sources while simultaneously maximizing the discrimination between different spectral shapes on X-ray color-color diagrams.

Numerous source-specific catalog properties are evaluated within defined apertures. The authors define the "PSF 90% ECF aperture" for each source to be the ellipse that encloses 90% of the total counts in a model PSF centered on the source position. Because the size of the PSF is energy-dependent, the dimensions of the PSF 90% ECF aperture vary with energy band. They define the "source region aperture" for each source to be equal to the corresponding 3-sigma source region ellipse included in the merged source list, scaled by a factor of 1.5. Like the PSF 90% ECF aperture, the source region aperture is also centered on the source position, but the dimensions of the aperture are independent of energy band.

The Chandra Source Catalog v1.1 "Master Sources Table", contained herein, includes the information contained in the original release (v1.0.1), plus point- and compact-source data extracted from HRC imaging observations, and catch-up ACIS observations released publicly prior to the end of 2009.


Catalog Bibcode

2010ApJS..189...37E

References

The Chandra Source Catalog
     Evans I.N., Primini F.A., Glotfelty C.S., Anderson C.S., Bonaventura N.R.,
     Chen J.C., Davis J.E., Doe S.M., Evans J.D., Fabbiano G., Galle E.C.,
     Gibbs D.G., Grier J.D., Hain R.M., Hall D.M., Harbo P.N., He X.,
     Houck J.C., Karovska M., Kashyap V.L., Lauer J., McCollough M.L.,
     McDowell J.C., Miller J.B., Mitschang A.W., Morgan D.L., Mossman A.E.,
     Nichols J.S., Nowak M.A., Plummer D.A., Refsdal B.L., Rots A.H.,
     Siemiginowska A., Sundheim B.A., Tibbetts M.S., Van Stone D.W.,
     Winkelman S.L., Zografou P.
   <Astrophys. J. Suppl. Ser. 189, 37 (2010)>
   =2010ApJS..189...37E

Provenance

This database table was created by the HEASARC in April 2014 based on a download of the online table of the Chandra Source Catalog, v1.1, at CXC using the CLI: see http://cxc.harvard.edu/csc/.

Parameters

Msid
The Chandra Source Catalog 'Master Source identifier', or MSID.

Name
The Chandra Source Catalog name in the IAU position-based nomenclature, viz., 'CXO Jhhmmss.s '+/-' ddmmss', where the 'CXO' prefix stands for Chandra X-ray Observatory.

FB_Var_Inter_Index
The inter-observation variability index in the range [0, 10], where the higher the value, the more likely the source is variable. This indicates whether the source region photon flux is constant between observations in the ACIS broad energy band. See Section 3.12.2 and Table 7 of the reference paper for more details.

HB_Var_Inter_Index
The inter-observation variability index in the range [0, 10], where the higher the value, the more likely the source is variable. This indicates whether the source region photon flux is constant between observations in the ACIS hard energy band. See Section 3.12.2 and Table 7 of the reference paper for more details.

MB_Var_Inter_Index
The inter-observation variability index in the range [0, 10], where the higher the value, the more likely the source is variable. This indicates whether the source region photon flux is constant between observations in the ACIS medium energy band. See Section 3.12.2 and Table 7 of the reference paper for more details.

SB_Var_Inter_Index
The inter-observation variability index in the range [0, 10], where the higher the value, the more likely the source is variable. This indicates whether the source region photon flux is constant between observations in the ACIS soft energy band. See Section 3.12.2 and Table 7 of the reference paper for more details.

USB_Var_Inter_Index
The inter-observation variability index in the range [0, 10], where the higher the value, the more likely the source is variable. This indicates whether the source region photon flux is constant between observations in the ACIS ultrasoft energy band. See Section 3.12.2 and Table 7 of the reference paper for more details.

FB_Var_Intra_Index
The highest value across all observations of the intra-observation Gregory-Loredo variability index in the range [0, 10], where the higher the value, the more likely the source is variable during an observation in the ACIS broad energy band. See Section 3.12.1 and Table 6 of the reference paper for more details.

HB_Var_Intra_Index
The highest value across all observations of the intra-observation Gregory-Loredo variability index in the range [0, 10], where the higher the value, the more likely the source is variable during an observation in the ACIS hard energy band. See Section 3.12.1 and Table 6 of the reference paper for more details.

MB_Var_Intra_Index
The highest value across all observations of the intra-observation Gregory-Loredo variability index in the range [0, 10], where the higher the value, the more likely the source is variable during an observation in the ACIS medium energy band. See Section 3.12.1 and Table 6 of the reference paper for more details.

SB_Var_Intra_Index
The highest value across all observations of the intra-observation Gregory-Loredo variability index in the range [0, 10], where the higher the value, the more likely the source is variable during an observation in the ACIS soft energy band. See Section 3.12.1 and Table 6 of the reference paper for more details.

USB_Var_Intra_Index
The highest value across all observations of the intra-observation Gregory-Loredo variability index in the range [0, 10], where the higher the value, the more likely the source is variable during an observation in the ACIS ultrasoft energy band. See Section 3.12.1 and Table 6 of the reference paper for more details.

Alpha
The photon index (alpha, defined as FE ~ 1/Ealpha) of the best power-law model spectral fit to the source region aperture (see Overview) PI spectrum.

RA
The Right Ascension of the X-ray source in the selected equinox. This was given in ICRS coordinates in the original source table.

Dec
The Declination of the X-ray source in the selected equinox. This was given in ICRS coordinates in the original source table.

LII
The Galactic Longitude of the X-ray source.

BII
The Galactic Latitude of the X-ray source.

Error_Ellipse_Angle
The position angle of the major axis of the 95% confidence level error ellipse, in degrees. In this release a position error circle was substituted for the position error ellipse, so this parameter is meaningless and the error ellipse radii are identical.

Error_Ellipse_R0
The major radius of the 95% confidence level error ellipse, in arcseconds. In this release a position error circle was substituted for the position error ellipse, so this parameter is meaningless and the error ellipse radii are identical.

Error_Ellipse_R1
The minor radius of the 95% confidence level error ellipse, in arcseconds. In this release a position error circle was substituted for the position error ellipse, so this parameter is meaningless and the error ellipse radii are identical.

Significance
The highest source flux significance across all the observations of the source.

FB_Flux_Ap90
The aperture-corrected net energy flux inferred from the PSF 90% ECF aperture (see Overview), calculated by counting X-ray events in the ACIS broad energy band, in erg cm-2 s-1.

HB_Flux_Ap90
The aperture-corrected net energy flux inferred from the PSF 90% ECF aperture (see Overview), calculated by counting X-ray events in the ACIS hard energy band, in erg cm-2 s-1.

MB_Flux_Ap90
The aperture-corrected net energy flux inferred from the PSF 90% ECF aperture (see Overview), calculated by counting X-ray events in the ACIS medium energy band, in erg cm-2 s-1.

SB_Flux_Ap90
The aperture-corrected net energy flux inferred from the PSF 90% ECF aperture (see Overview), calculated by counting X-ray events in the ACIS soft energy band, in erg cm-2 s-1.

USB_Flux_Ap90
The aperture-corrected net energy flux inferred from the PSF 90% ECF aperture (see Overview), calculated by counting X-ray events in the ACIS ultrasoft energy band, in erg cm-2 s-1.

Flux_Plaw
The net integrated 0.5-10 keV energy flux of the best power-law model spectral fit to the source region aperture (see Overview) PI spectrum in erg cm-2 s-1.

Hardness_Ratio_Hm
The spectral hardness ratio measured between ACIS energy bands 'h' and 'm'; hard_hm = (hb_flux_ap - mb_flux_ap) / fb_flux_ap

Hardness_Ratio_Hs
The spectral hardness ratio measured between ACIS energy bands 'h' and 's'; hard_hs = (hb_flux_ap - sb_flux_ap) / fb_flux_ap

Hardness_Ratio_Ms
The spectral hardness ratio measured between ACIS energy bands 'm' and 's'; hard_ms = (mb_flux_ap - sb_flux_ap) / fb_flux_ap

NH_Plaw
The total neutral Hydrogen column density, NH, of the best power-law model spectral fit to the source region aperture (see Overview) PI spectrum, in H atoms cm-2.

ACIS_Hetg_Num
The total number of ACIS/HETG observations contributing to the Master Sources Table record of the source. In this release no grating observations were included, so the value of this parameter is always 0.

ACIS_Letg_Num
The total number of ACIS/LETG observations contributing to the Master Sources Table record of the source. In this release no grating observations were included, so the value of this parameter is always 0.

ACIS_Num
The total number of ACIS imaging observations contributing to the Master Sources Table record of the source.

HRC_Hetg_Num
The total number of HRC/HETG observations contributing to the Master Sources Table record of the source. In this release no grating observations were included, so the value of this parameter is always 0.

HRC_Letg_Num
The total number of HRC/LETG observations contributing to the Master Sources Table record of the source. In this release no grating observations were included, so the value of this parameter is always 0.

HRC_Num
The total number of HRC imaging observations contributing to the Master Sources Table record of the source.

ACIS_Hetg_Time
The total ACIS/HETG observation exposure time (seconds of good time) for all ACIS/HETG observations contributing to the Master Sources Table record of the source. In this release no grating observations were included, so the value of this parameter is always 0.

ACIS_Letg_Time
The total ACIS/LETG observation exposure time (seconds of good time) for all ACIS/LETG observations contributing to the Master Sources Table record of the source. In this release no grating observations were included, so the value of this parameter is always 0.

ACIS_Time
The total ACIS imaging exposure time (seconds of good time) for all ACIS imaging observations contributing to the Master Sources Table record of the source.

FB_Flux_Ap
The aperture-corrected net energy flux inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS broad energy band, in erg cm-2 s-1.

HB_Flux_Ap
The aperture-corrected net energy flux inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS hard energy band, in erg cm-2 s-1.

MB_Flux_Ap
The aperture-corrected net energy flux inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS medium energy band, in erg cm-2 s-1.

SB_Flux_Ap
The aperture-corrected net energy flux inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS soft energy band, in erg cm-2 s-1.

USB_Flux_Ap
The aperture-corrected net energy flux inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS ultrasoft energy band, in erg cm-2 s-1.

Flux_BB
The net integrated 0.5-10 keV energy flux of the best black-body model spectral fit to the source region aperture (see Overview) PI spectrum, in erg cm-2 s-1.

FB_Flux_BB_Ap90
The aperture-corrected net energy flux inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS broad energy band, in erg cm-2 s-1.

HB_Flux_BB_Ap90
The aperture-corrected net energy flux inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS hard energy band, in erg cm-2 s-1.

MB_Flux_BB_Ap90
The aperture-corrected net energy flux inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS medium energy band, in erg cm-2 s-1.

SB_Flux_BB_Ap90
The aperture-corrected net energy flux inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS soft energy band, in erg cm-2 s-1.

USB_Flux_BB_Ap90
The aperture-corrected net energy flux inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS ultrasoft energy band, in erg cm-2 s-1.

FB_Flux_BB_Ap
The aperture-corrected net energy flux inferred from the source region aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS broad energy band, in erg cm-2 s-1.

HB_Flux_BB_Ap
The aperture-corrected net energy flux inferred from the source region aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS hard energy band, in erg cm-2 s-1.

MB_Flux_BB_Ap
The aperture-corrected net energy flux inferred from the source region aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS medium energy band, in erg cm-2 s-1.

SB_Flux_BB_Ap
The aperture-corrected net energy flux inferred from the source region aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS soft energy band, in erg cm-2 s-1.

USB_Flux_BB_Ap
The aperture-corrected net energy flux inferred from the source region aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS ultrasoft energy band, in erg cm-2 s-1.

FB_Flux_Plaw_Ap90
The aperture-corrected net energy flux inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS broad energy band, in erg cm-2 s-1.

HB_Flux_Plaw_Ap90
The aperture-corrected net energy flux inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS hard energy band, in erg cm-2 s-1.

MB_Flux_Plaw_Ap90
The aperture-corrected net energy flux inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS medium energy band, in erg cm-2 s-1.

SB_Flux_Plaw_Ap90
The aperture-corrected net energy flux inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS soft energy band, in erg cm-2 s-1.

USB_Flux_Plaw_Ap90
The aperture-corrected net energy flux inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS ultrasoft energy band, in erg cm-2 s-1.

FB_Flux_Plaw_Ap
The aperture-corrected net energy flux inferred from the source region aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS broad energy band, in erg cm-2 s-1.

HB_Flux_Plaw_Ap
The aperture-corrected net energy flux inferred from the source region aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS hard energy band, in erg cm-2 s-1.

MB_Flux_Plaw_Ap
The aperture-corrected net energy flux inferred from the source region aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS medium energy band, in erg cm-2 s-1.

SB_Flux_Plaw_Ap
The aperture-corrected net energy flux inferred from the source region aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS soft energy band, in erg cm-2 s-1.

USB_Flux_Plaw_Ap
The aperture-corrected net energy flux inferred from the source region aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS ultrasoft energy band, in erg cm-2 s-1.

HRC_Hetg_Time
The total HRC/HETG observation exposure time (seconds of good time) for all HRC/HETG observations contributing to the Master Sources Table record of the source. In this release no grating observations were included, so the value of this parameter is always 0.

HRC_Letg_Time
The total HRC/LETG observation exposure time (seconds of good time) for all HRC/LETG observations contributing to the Master Sources Table record of the source. In this release no grating observations were included, so the value of this parameter is always 0.

HRC_Time
The total HRC imaging exposure time (seconds of good time) for all HRC imaging observations contributing to the Master Sources Table record of the source.

FB_Kp_Intra_Prob
The highest value across all observations of the intra-observation Kuiper's test variability probability in the ACIS broad energy band.

HB_Kp_Intra_Prob
The highest value across all observations of the intra-observation Kuiper's test variability probability in the ACIS hard energy band.

MB_Kp_Intra_Prob
The highest value across all observations of the intra-observation Kuiper's test variability probability in the ACIS medium energy band.

SB_Kp_Intra_Prob
The highest value across all observations of the intra-observation Kuiper's test variability probability in the ACIS soft energy band.

USB_Kp_Intra_Prob
The highest value across all observations of the intra-observation Kuiper's test variability probability in the ACIS ultrasoft energy band.

FB_Ks_Intra_Prob
The highest value across all observations of the intra-observation Kolmogorov-Smirnov variability probability in the ACIS broad energy band.

HB_Ks_Intra_Prob
The highest value across all observations of the intra-observation Kolmogorov-Smirnov variability probability in the ACIS hard energy band.

MB_Ks_Intra_Prob
The highest value across all observations of the intra-observation Kolmogorov-Smirnov variability probability in the ACIS medium energy band.

SB_Ks_Intra_Prob
The highest value across all observations of the intra-observation Kolmogorov-Smirnov variability probability in the ACIS soft energy band.

USB_Ks_Intra_Prob
The highest value across all observations of the intra-observation Kolmogorov-Smirnov variability probability in the ACIS ultrasoft energy band.

kT
The temperature (kT), in keV, of the best black-body model spectral fit to the source region aperture (see Overview) PI spectrum.

FB_Major_Axis
The 1-sigma radius, in arcseconds, along the major axis of the ellipse defining the deconvolved source extent in the ACIS broad energy band.

FB_Major_Axis_Error
The estimated error in the deconvolved source extent major axis in the ACIS broad energy band, in arcseconds.

HB_Major_Axis
The 1-sigma radius along the major axis of the ellipse defining the deconvolved source extent in the ACIS hard energy band, in arcseconds.

HB_Major_Axis_Error
The estimated error in the deconvolved source extent major axis in the ACIS hard energy band, in arcseconds.

MB_Major_Axis
The 1-sigma radius along the major axis of the ellipse defining the deconvolved source extent in the ACIS medium energy band, in arcseconds.

MB_Major_Axis_Error
The estimated error in the deconvolved source extent major axis in the ACIS medium energy band, in arcseconds.

SB_Major_Axis
The 1-sigma radius along the major axis of the ellipse defining the deconvolved source extent in the ACIS soft energy band, in arcseconds.

SB_Major_Axis_Error
The estimated error in the deconvolved source extent major axis in the ACIS soft energy band, in arcseconds.

USB_Major_Axis
The 1-sigma radius along the major axis of the ellipse defining the deconvolved source extent in the ACIS ultrasoft energy band, in arcseconds.

USB_Major_Axis_Error
The estimated error in the deconvolved source extent major axis in the ACIS ultrasoft energy band, in arcseconds.

FB_Minor_Axis
The 1-sigma radius along the minor axis of the ellipse defining the deconvolved source extent in the ACIS broad energy band, in arcseconds.

FB_Minor_Axis_Error
The estimated error in the deconvolved source extent minor axis in the ACIS broad energy band, in arcseconds.

HB_Minor_Axis
The 1-sigma radius along the minor axis of the ellipse defining the deconvolved source extent in the ACIS hard energy band, in arcseconds.

HB_Minor_Axis_Error
The estimated error in the deconvolved source extent minor axis in the ACIS hard energy band, in arcseconds.

MB_Minor_Axis
The 1-sigma radius along the minor axis of the ellipse defining the deconvolved source extent in the ACIS medium energy band, in arcseconds.

MB_Minor_Axis_Error
The estimated error in the deconvolved source extent minor axis in the ACIS medium energy band, in arcseconds.

SB_Minor_Axis
The 1-sigma radius along the minor axis of the ellipse defining the deconvolved source extent in the ACIS soft energy band, in arcseconds.

SB_Minor_Axis_Error
The estimated error in the deconvolved source extent minor axis in the ACIS soft energy band, in arcseconds.

USB_Minor_Axis
The 1-sigma radius along the minor axis of the ellipse defining the deconvolved source extent in the ACIS ultrasoft energy band, in arcseconds.

USB_Minor_Axis_Error
The estimated error in the deconvolved source extent minor axis in the ACIS ultrasoft energy band, in arcseconds.

NH_BB
The total neutral Hydrogen column density, NH, of the best black-body model spectral fit to the source region aperture (see Overview) PI spectrum, in H atoms cm-2.

NH_Gal
The Galactic neutral Hydrogen column density, NH(Gal) in the direction of the source determined from Dickey & Lockman (Dickey, J. M., & Lockman, F. J. 1990, ARA&A, 28, 215), in H atoms cm-2.

FB_Photflux_Ap90
The aperture-corrected net photon flux inferred from the Point Spread Function 90% Enclosed Counts Fraction aperture, calculated by counting X-ray events in the ACIS broad energy band, in photon cm-2 s-1.

HB_Photflux_Ap90
The aperture-corrected net photon flux inferred from the Point Spread Function 90% Enclosed Counts Fraction aperture, calculated by counting X-ray events in the ACIS hard energy band, in photon cm-2 s-1.

MB_Photflux_Ap90
The aperture-corrected net photon flux inferred from the Point Spread Function 90% Enclosed Counts Fraction aperture, calculated by counting X-ray events in the ACIS medium energy band, in photon cm-2 s-1.

SB_Photflux_Ap90
The aperture-corrected net photon flux inferred from the Point Spread Function 90% Enclosed Counts Fraction aperture, calculated by counting X-ray events in the ACIS soft energy band, in photon cm-2 s-1.

USB_Photflux_Ap90
The aperture-corrected net photon flux inferred from the Point Spread Function 90% Enclosed Counts Fraction aperture, calculated by counting X-ray events in the ACIS ultrasoft energy band, in photon cm-2 s-1.

FB_Photflux_Ap
The aperture-corrected net photon flux inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS broad energy band, in photon cm-2 s-1.

HB_Photflux_Ap
The aperture-corrected net photon flux inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS hard energy band, in photon cm-2 s-1.

MB_Photflux_Ap
The aperture-corrected net photon flux inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS medium energy band, in photon cm-2 s-1.

SB_Photflux_Ap
The aperture-corrected net photon flux inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS soft energy band, in photon cm-2 s-1.

USB_Photflux_Ap
The aperture-corrected net photon flux inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS ultrasoft energy band, in photon cm-2 s-1.

FB_Position_Angle
The position angle of the major axis of the ellipse defining the deconvolved source extent in the ACIS broad energy band, in degrees. In this release, this parameter is always zero because the deconvolved source extent was approximated as being circularly symmetric.

FB_Position_Angle_Error
The estimated error in the deconvolved source extent position angle in the ACIS broad energy band, in degrees.

HB_Position_Angle
The position angle of the major axis of the ellipse defining the deconvolved source extent in the ACIS hard energy band, in degrees. In this release, this parameter is always zero because the deconvolved source extent was approximated as being circularly symmetric.

HB_Position_Angle_Error
The estimated error in the deconvolved source extent position angle in the ACIS hard energy band, in degrees.

MB_Position_Angle
The position angle of the major axis of the ellipse defining the deconvolved source extent in the ACIS medium energy band, in degrees. In this release, this parameter is always zero because the deconvolved source extent was approximated as being circularly symmetric.

MB_Position_Angle_Error
The estimated error in the deconvolved source extent position angle in the ACIS medium energy band, in degrees.

SB_Position_Angle
The position angle of the major axis of the ellipse defining the deconvolved source extent in the ACIS soft energy band, in degrees. In this release, this parameter is always zero because the deconvolved source extent was approximated as being circularly symmetric.

SB_Position_Angle_Error
The estimated error in the deconvolved source extent position angle in the ACIS soft energy band, in degrees.

USB_Position_Angle
The position angle of the major axis of the ellipse defining the deconvolved source extent in the ACIS ultrasoft energy band, in degrees. In this release, this parameter is always zero because the deconvolved source extent was approximated as being circularly symmetric.

USB_Position_Angle_Error
The estimated error in the deconvolved source extent position angle in the ACIS ultrasoft energy band, in degrees.

FB_Var_Inter_Prob
The inter-observation variability probability, calculated from the chi2 distribution of the photon fluxes of the individual observations in the ACIS broad energy band.

HB_Var_Inter_Prob
The inter-observation variability probability, calculated from the chi2 distribution of the photon fluxes of the individual observations in the ACIS hard energy band.

MB_Var_Inter_Prob
The inter-observation variability probability, calculated from the chi2 distribution of the photon fluxes of the individual observations in the ACIS medium energy band.

SB_Var_Inter_Prob
The inter-observation variability probability, calculated from the chi2 distribution of the photon fluxes of the individual observations in the ACIS soft energy band.

USB_Var_Inter_Prob
The inter-observation variability probability, calculated from the chi2 distribution of the photon fluxes of the individual observations in the ACIS ultrasoft energy band.

FB_Var_Inter_Sigma
The inter-observation flux variability standard deviation; the spread of the individual observation photon fluxes about the error weighted mean in the ACIS broad energy band.

HB_Var_Inter_Sigma
The inter-observation flux variability standard deviation; the spread of the individual observation photon fluxes about the error weighted mean in the ACIS hard energy band.

MB_Var_Inter_Sigma
The inter-observation flux variability standard deviation; the spread of the individual observation photon fluxes about the error weighted mean in the ACIS medium energy band.

SB_Var_Inter_Sigma
The inter-observation flux variability standard deviation; the spread of the individual observation photon fluxes about the error weighted mean in the ACIS soft energy band.

USB_Var_Inter_Sigma
The inter-observation flux variability standard deviation; the spread of the individual observation photon fluxes about the error weighted mean in the ACIS ultrasoft energy band.

FB_Var_Intra_Prob
The highest value across all observations of the intra-observation Gregory-Loredo variability probability in the ACIS broad energy band.

HB_Var_Intra_Prob
The highest value across all observations of the intra-observation Gregory-Loredo variability probability in the ACIS hard energy band.

MB_Var_Intra_Prob
The highest value across all observations of the intra-observation Gregory-Loredo variability probability in the ACIS medium energy band.

SB_Var_Intra_Prob
The highest value across all observations of the intra-observation Gregory-Loredo variability probability in the ACIS soft energy band.

USB_Var_Intra_Prob
The highest value across all observations of the intra-observation Gregory-Loredo variability probability in the ACIS ultrasoft energy band.

FB_Var_Intra_Sigma
The highest value across all observations of the intra-observation flux variability standard deviation, calculated from an optimally-binned light curve in the ACIS broad energy band.

HB_Var_Intra_Sigma
The highest value across all observations of the intra-observation flux variability standard deviation, calculated from an optimally-binned light curve in the ACIS hard energy band.

MB_Var_Intra_Sigma
The highest value across all observations of the intra-observation flux variability standard deviation, calculated from an optimally-binned light curve in the ACIS medium energy band.

SB_Var_Intra_Sigma
The highest value across all observations of the intra-observation flux variability standard deviation, calculated from an optimally-binned light curve in the ACIS soft energy band.

USB_Var_Intra_Sigma
The highest value across all observations of the intra-observation flux variability standard deviation, calculated from an optimally-binned light curve in the ACIS ultrasoft energy band.

Conf_Flag
This is set to 'T' if the source regions overlap (source is confused).

Extent_Flag
This is set to 'T' if the deconvolved source extent is inconsistent with a point source at the 90% confidence level.

Man_Inc_Flag
This is set to 'T' if the source was manually included in the catalog via human review.

Man_Match_Flag
This is set to 'T' if the cross-observation source matching was performed manually via human review.

Man_Reg_Flag
This is set to 'T' if the source region parameters (location, dimensions) were manually adjusted via human review.

Pileup_Flag
This is set to 'T' if the ACIS pile-up fraction exceeds ~ 10% in all observations; source properties may be affected.

Sat_Src_Flag
This is set to 'T' if the source is saturated in all observations; source properties are unreliable.

Streak_Src_Flag
This is set to 'T' if the source is detected on an ACIS readout streak in all observations: the source properties may be affected.

Var_Flag
This is set to 'T' if the source displays flux variability within an observation or between observations.

Var_Inter_Hard_Flag
This is set to 'T' if the source hardness ratios are statistically inconsistent across multiple observations.

HRC_Var_Inter_Index
The inter-observation variability index in the range [0, 10], where the higher the value, the more likely the source is variable. This indicates whether the source region photon flux is constant between observations in the HRC wide energy band.

HRC_Var_Intra_Index
The highest value across all observations of the intra-observation Gregory-Loredo variability index in the range [0, 10], where the higher the value, the more likely the source is variable during an observation in the HRC wide energy band.

Alpha_Upper
The 68% upper confidence limit to the photon index (alpha, defined as FE ~ 1/Ealpha) of the best power-law model spectral fit to the source region aperture (see Overview) PI spectrum.

Alpha_Lower
The 68% lower confidence limit to the photon index (alpha, defined as FE ~ 1/Ealpha) of the best power-law model spectral fit to the source region aperture (see Overview) PI spectrum.

FB_Flux_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated by counting X-ray events in the ACIS broad energy band.

HB_Flux_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated by counting X-ray events in the ACIS hard energy band.

MB_Flux_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated by counting X-ray events in the ACIS medium energy band.

SB_Flux_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated by counting X-ray events in the ACIS soft energy band.

USB_Flux_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated by counting X-ray events in the ACIS ultrasoft energy band.

FB_Flux_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated by counting X-ray events in the ACIS broad energy band.

HB_Flux_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated by counting X-ray events in the ACIS hard energy band.

MB_Flux_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated by counting X-ray events in the ACIS medium energy band.

SB_Flux_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated by counting X-ray events in the ACIS soft energy band.

USB_Flux_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated by counting X-ray events in the ACIS ultrasoft energy band.

HRC_Flux_Ap90
The aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated by counting X-ray events in the HRC wide energy band.

HRC_Flux_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated by counting X-ray events in the HRC wide energy band.

HRC_Flux_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated by counting X-ray events in the HRC wide energy band.

FB_Flux_AP_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS broad energy band.

HB_Flux_AP_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS hard energy band.

MB_Flux_AP_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS medium energy band.

SB_Flux_AP_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS soft energy band.

USB_Flux_AP_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS ultrasoft energy band.

FB_Flux_AP_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS broad energy band.

HB_Flux_AP_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS hard energy band.

MB_Flux_AP_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS medium energy band.

SB_Flux_AP_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS soft energy band.

USB_Flux_AP_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS ultrasoft energy band.

HRC_Flux_Ap
The aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the HRC wide energy band.

HRC_Flux_AP_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the HRC wide energy band.

HRC_Flux_AP_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the HRC wide energy band.

FB_Flux_BB_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS broad energy band.

HB_Flux_BB_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS hard energy band.

MB_Flux_BB_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS medium energy band.

SB_Flux_BB_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS soft energy band.

USB_Flux_BB_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS ultrasoft energy band.

HRC_Flux_BB_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the HRC wide energy band.

FB_Flux_BB_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS broad energy band.

HB_Flux_BB_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS hard energy band.

MB_Flux_BB_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS medium energy band.

SB_Flux_BB_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS soft energy band.

USB_Flux_BB_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS ultrasoft energy band.

HRC_Flux_BB_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the HRC wide energy band.

HRC_Flux_BB_Ap90
The aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the HRC wide energy band.

FB_Flux_BB_AP_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS broad energy band.

HB_Flux_BB_AP_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS hard energy band.

MB_Flux_BB_AP_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS medium energy band.

SB_Flux_BB_AP_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS soft energy band.

USB_Flux_BB_AP_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS ultrasoft energy band.

HRC_Flux_BB_AP_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the HRC wide energy band.

FB_Flux_BB_AP_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS broad energy band.

HB_Flux_BB_AP_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS hard energy band.

MB_Flux_BB_AP_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS medium energy band.

SB_Flux_BB_AP_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS soft energy band.

USB_Flux_BB_AP_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the ACIS ultrasoft energy band.

HRC_Flux_BB_AP_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the HRC wide energy band.

HRC_Flux_BB_Ap
The aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed kT = 1.0 keV black-body spectral model in the HRC wide energy band.

Flux_BB_Upper
The 68% upper confidence limit to the net integrated 0.5-10 keV energy flux of the best black-body model spectral fit to the source region aperture (see Overview) PI spectrum.

Flux_BB_Lower
The 68% lower confidence limit to the net integrated 0.5-10 keV energy flux of the best black-body model spectral fit to the source region aperture (see Overview) PI spectrum.

FB_Flux_Plaw_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS broad energy band.

HB_Flux_Plaw_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS hard energy band.

MB_Flux_Plaw_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS medium energy band.

SB_Flux_Plaw_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS soft energy band.

USB_Flux_Plaw_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS ultrasoft energy band.

HRC_Flux_Plaw_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the HRC wide energy band.

FB_Flux_Plaw_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS broad energy band.

HB_Flux_Plaw_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS hard energy band.

MB_Flux_Plaw_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS medium energy band.

SB_Flux_Plaw_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS soft energy band.

USB_Flux_Plaw_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS ultrasoft energy band.

HRC_Flux_Plaw_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the HRC wide energy band.

HRC_Flux_Plaw_Ap90
The aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the PSF 90% ECF aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the HRC wide energy band.

FB_Flux_Plaw_AP_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS broad energy band.

HB_Flux_Plaw_AP_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS hard energy band.

MB_Flux_Plaw_AP_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS medium energy band.

SB_Flux_Plaw_AP_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS soft energy band.

USB_Flux_Plaw_AP_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS ultrasoft energy band.

HRC_Flux_Plaw_AP_Upper
The 68% upper confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the HRC wide energy band.

FB_Flux_Plaw_AP_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS broad energy band.

HB_Flux_Plaw_AP_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS hard energy band.

MB_Flux_Plaw_AP_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS medium energy band.

SB_Flux_Plaw_AP_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS soft energy band.

USB_Flux_Plaw_AP_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the ACIS ultrasoft energy band.

HRC_Flux_Plaw_AP_Lower
The 68% lower confidence limit to the aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the HRC wide energy band.

HRC_Flux_Plaw_Ap
The aperture-corrected net energy flux, in erg cm-2 s-1, inferred from the source region aperture (see Overview), calculated from an absorbed E-1.7 power-law spectral model in the HRC wide energy band.

Flux_Plaw_Upper
The 68% upper confidence limit to the net integrated 0.5-10 keV energy flux of the best power-law model spectral fit to the source region aperture (see Overview) PI spectrum.

Flux_Plaw_Lower
The 68% lower confidence limit to the net integrated 0.5-10 keV energy flux of the best power-law model spectral fit to the source region aperture (see Overview) PI spectrum.

Hardness_Ratio_Hm_Upper
The 68% upper confidence limit to the spectral hardness ratio measured between ACIS energy bands 'h' and 'm'; hard_hm = (hb_flux_ap - mb_flux_ap) / fb_flux_ap.

Hardness_Ratio_Hm_Lower
The 68% lower confidence limit to the spectral hardness ratio measured between ACIS energy bands 'h' and 'm'; hard_hm = (hb_flux_ap - mb_flux_ap) / fb_flux_ap.

Hardness_Ratio_Hs_Upper
The 68% upper confidence limit to the spectral hardness ratio measured between ACIS energy bands 'h' and 's'; hard_hs = (hb_flux_ap - sb_flux_ap) / fb_flux_ap.

Hardness_Ratio_Hs_Lower
The 68% lower confidence limit to the spectral hardness ratio measured between ACIS energy bands 'h' and 's'; hard_hs = (hb_flux_ap - sb_flux_ap) / fb_flux_ap.

Hardness_Ratio_Ms_Upper
The 68% upper confidence limit to the spectral hardness ratio measured between ACIS energy bands 'm' and 's'; hard_ms = (mb_flux_ap - sb_flux_ap) / fb_flux_ap.

Hardness_Ratio_Ms_Lower
The 68% lower confidence limit to the spectral hardness ratio measured between ACIS energy bands 'm' and 's'; hard_ms = (mb_flux_ap - sb_flux_ap) / fb_flux_ap.

HRC_Kp_Intra_Prob
The highest value across all observations of the intra-observation Kuiper's test variability probability in the HRC wide energy band.

HRC_Ks_Intra_Prob
The highest value across all observations of the intra-observation Kolmogorov-Smirnov variability probability in the HRC wide energy band.

kT_Upper
The 68% upper confidence limit to the temperature (kT), in keV, of the best black-body model spectral fit to the source region aperture (see Overview) PI spectrum.

kT_Lower
The 68% lower confidence limit to the temperature (kT), in keV, of the best black-body model spectral fit to the source region aperture (see Overview) PI spectrum.

HRC_Major_Axis
The 1-sigma radius, in arcseconds, along the major axis of the ellipse defining the deconvolved source extent in the HRC wide energy band.

HRC_Major_Axis_Error
The estimated error in the deconvolved source extent major axis, in arcseconds, in the HRC wide energy band.

HRC_Minor_Axis
The 1-sigma radius, in arcseconds, along the minor axis of the ellipse defining the deconvolved source extent in the HRC wide energy band.

HRC_Minor_Axis_Error
The estimated error, in arcseconds, in the deconvolved source extent minor axis in the HRC wide energy band.

NH_BB_Upper
The 68% upper confidence limit to the total neutral Hydrogen column density NH, in H atoms cm-2, of the best black-body model spectral fit to the source region aperture (see Overview) PI spectrum.

NH_BB_Lower
The 68% lower confidence limit to the total neutral Hydrogen column density NH, in H atoms cm-2, of the best black-body model spectral fit to the source region aperture (see Overview) PI spectrum.

NH_Plaw_Upper
The 68% upper confidence limit to the total neutral Hydrogen column density NH, in H atoms cm-2, of the best power-law model spectral fit to the source region aperture (see Overview) PI spectrum.

NH_Plaw_Lower
The 68% lower confidence limit to the total neutral Hydrogen column density NH, in H atoms cm-2, of the best power-law model spectral fit to the source region aperture (see Overview) PI spectrum.

FB_Photflux_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the Point Spread Function 90% Enclosed Counts Fraction aperture, calculated by counting X-ray events in the ACIS broad energy band.

HB_Photflux_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the Point Spread Function 90% Enclosed Counts Fraction aperture, calculated by counting X-ray events in the ACIS hard energy band.

MB_Photflux_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the Point Spread Function 90% Enclosed Counts Fraction aperture, calculated by counting X-ray events in the ACIS medium energy band.

SB_Photflux_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the Point Spread Function 90% Enclosed Counts Fraction aperture, calculated by counting X-ray events in the ACIS soft energy band.

USB_Photflux_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the Point Spread Function 90% Enclosed Counts Fraction aperture, calculated by counting X-ray events in the ACIS ultrasoft energy band.

HRC_Photflux_Ap90_Upper
The 68% upper confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the Point Spread Function 90% Enclosed Counts Fraction aperture, calculated by counting X-ray events in the HRC wide energy band.

FB_Photflux_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the Point Spread Function 90% Enclosed Counts Fraction aperture, calculated by counting X-ray events in the ACIS broad energy band.

HB_Photflux_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the Point Spread Function 90% Enclosed Counts Fraction aperture, calculated by counting X-ray events in the ACIS hard energy band.

MB_Photflux_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the Point Spread Function 90% Enclosed Counts Fraction aperture, calculated by counting X-ray events in the ACIS medium energy band.

SB_Photflux_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the Point Spread Function 90% Enclosed Counts Fraction aperture, calculated by counting X-ray events in the ACIS soft energy band.

USB_Photflux_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the Point Spread Function 90% Enclosed Counts Fraction aperture, calculated by counting X-ray events in the ACIS ultrasoft energy band.

HRC_Photflux_Ap90_Lower
The 68% lower confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the Point Spread Function 90% Enclosed Counts Fraction aperture, calculated by counting X-ray events in the HRC wide energy band.

HRC_Photflux_Ap90
The aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the Point Spread Function 90% Enclosed Counts Fraction aperture, calculated by counting X-ray events in the HRC wide energy band.

FB_Photflux_AP_Upper
The 68% upper confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS broad energy band.

HB_Photflux_AP_Upper
The 68% upper confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS hard energy band.

MB_Photflux_AP_Upper
The 68% upper confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS medium energy band.

SB_Photflux_AP_Upper
The 68% upper confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS soft energy band.

USB_Photflux_AP_Upper
The 68% upper confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS ultrasoft energy band.

HRC_Photflux_AP_Upper
The 68% upper confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the HRC wide energy band.

FB_Photflux_AP_Lower
The 68% lower confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS broad energy band.

HB_Photflux_AP_Lower
The 68% lower confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS hard energy band.

MB_Photflux_AP_Lower
The 68% lower confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS medium energy band.

SB_Photflux_AP_Lower
The 68% lower confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS soft energy band.

USB_Photflux_AP_Lower
The 68% lower confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the ACIS ultrasoft energy band.

HRC_Photflux_AP_Lower
The 68% lower confidence limit to the aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the HRC wide energy band.

HRC_Photflux_Ap
The aperture-corrected net photon flux, in photons cm-2 s-1, inferred from the source region aperture (see Overview), calculated by counting X-ray events in the HRC wide energy band.

HRC_Position_Angle
The position angle of the major axis of the ellipse defining the deconvolved source extent in the HRC wide energy band, in degrees.

HRC_Position_Angle_Error
The estimated error in the deconvolved source extent position angle in the HRC wide energy band, in degrees.

HRC_Var_Inter_Prob
The inter-observation variability probability, calculated from the chi2 distribution of the photon fluxes of the individual observations in the HRC wide energy band.

HRC_Var_Inter_Sigma
The inter-observation flux variability standard deviation; the spread of the individual observation photon fluxes about the error weighted mean in the HRC wide energy band.

HRC_Var_Intra_Prob
The highest value across all observations of the intra-observation Gregory-Loredo variability probability in the HRC wide energy band.

HRC_Var_Intra_Sigma
The highest value across all observations of the intra-observation flux variability standard deviation, calculated from an optimally-binned light curve in the HRC wide energy band.


Contact Person

Questions regarding the CSC database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 15-Apr-2014