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NUSTARSSC - NuSTAR Serendipitous Survey 40-Month Primary Source Catalog

HEASARC
Archive

Overview

This table contains the first full catalog and science results for the Nuclear Spectroscopic Telescope Array (NuSTAR) Serendipitous Survey. The catalog incorporates data taken during the first 40 months of NuSTAR operation, which provide ~20 Ms of effective exposure time over 331 fields, with an areal coverage of 13 deg2, and 498 sources (the abstract of the reference paper states that there are 497 sources) detected in total over the 3-24 keV energy range. There are 276 sources with spectroscopic redshifts and classifications, largely resulting from the authors' extensive campaign of ground-based spectroscopic follow-up. The authors characterize the overall sample in terms of the X-ray, optical, and infrared source properties. The sample is primarily composed of active galactic nuclei (AGN), detected over a large range in redshift from z = 0.002 to 3.4 (median redshift z of 0.56), but also includes 16 spectroscopically confirmed Galactic sources. There is a large range in X-ray flux, from log (f3-24keV) ~ -14 to -11 (in units of erg s-1 cm-2), and in rest-frame 10-40 keV luminosity, from log (L_10-40keV) ~ 39 to 46 (in units of erg s-1), with a median of 44.1. Approximately 79% of the NuSTAR sources have lower-energy (<10 keV) X-ray counterparts from XMM-Newton, Chandra, and Swift XRT observations. The mid-infrared (MIR) analysis, using WISE all-sky survey data, shows that MIR AGN color selections miss a large fraction of the NuSTAR-selected AGN population, from ~15% at the highest luminosities (LX > 1044 erg s-1) to ~80% at the lowest luminosities (LX < 1043 erg s-1). The authors' optical spectroscopic analysis finds that the observed fraction of optically obscured AGN (i.e., the type 2 fraction) is F_Type 2_ = 53 (+14, -15) per cent, for a well-defined subset of the 8-24 keV selected sample. This is higher, albeit at a low significance level, than the type 2 fraction measured for redshift- and luminosity-matched AGNs selected by <10 keV X-ray missions.

This table contains the Primary NuSTAR Serendipitous Source Catalog of 498 sources found using the source detection procedure described in Section 2.3 of the reference paper, and listed in Table 5 (op. cit.). Additional information on these Primary Catalog sources that the authors obtained using optical spectroscopy is available in Table 6 of the reference paper (q.v.). This table does not contain the 64 sources in the Secondary NuSTAR Serendipitous Source Catalog that were found using wavdetect and that are listed in Table 7 of the reference paper: this is available in the HEASARC database as a separate table, dubbed NUSTARSSC2.


Catalog Bibcode

2017ApJ...836...99L

References

The NuSTAR Serendipitous Survey: the 40 Month Catalog and the Properties of
the Distant High Energy X-ray Source Population.
      Lansbury G.B., Stern D., Aird J., Alexander D.M., Fuentes C.,
      Harrison F.A., Treister E., Bauer F.E., Tomsick J.A., Balokovic M.,
      Del Moro A., Gandhi P., Ajello M., Annuar A., Ballantyne D.R.,
      Boggs S.E., Brandt W.N., Brightman M., Chen C.-T.J., Christensen F.E.,
      Civano F., Comastri A., Craig W.W., Forster K., Grefenstette B.W.,
      Hailey C.J., Hickox R.C., Jiang B., Jun H.D., Koss M., Marchesi S.,
      Melo A.D., Mullaney J.R., Noirot G., Schulze S., Walton D.J.,
      Zappacosta L., Zhang W.W.
     <Astrophys. J. 836, 99 (2017)>
     =2017ApJ...836...99L        (SIMBAD/NED BibCode)

Provenance

This table was created by the HEASARC in July 2017 based on the machine-readable version of Table 5 from the reference paper, the Primary NuSTAR Serendipitous Source Catalog, that was obtsined from the ApJ web site.

Parameters

Source_Number
A sequential identification number from 1 to 498 for each NuSTAR X-ray source in the Primary Catalog, sorted in order of increasing J2000.0 Right Ascension. Notice that the 64 sources in the Secondary NuSTAR Serendipitous Source Catalog are numbered from 1 to 64, so, when referring to a source in this present catalog, the HEASARC suggests using a prefix of 'P' as a unique descriptor.

Name
The NuSTAR J2000.0 position-based source designation, viz., 'NuSTAR JHHMMSS+DDMM.m', as registered with the Dictionary of Nomenclature of Celestial Objects.

RA
The Right Ascension of the NuSTAR source in the selected equinox. This was given in J2000 decimal degree coordinates to a precision of 10-6 degrees in the original table.

Dec
The Declination of the NuSTAR source in the selected equinox. This was given in J2000 decimal degree coordinates to a precision of 10-6 degrees in the original table.

LII
The Galactic Longitude of the NuSTAR source.

BII
The Galactic Latitude of the NuSTAR source.

SB_Detect_Flag
A binary flag indicating whether (1) or not (0) the source is detected with a false probability lower than the threshold of log (PFalse) = -6, for the soft (3-8 keV) energy band.

HB_Detect_Flag
A binary flag indicating whether (1) or not (0) the source is detected with a false probability lower than the threshold of log (PFalse) = -6, for the hard (8-24 keV) energy band.

FB_Detect_Flag
A binary flag indicating whether (1) or not (0) the source is detected with a false probability lower than the threshold of log (PFalse) = -6, for the full (3-24 keV) energy band.

DB_SB_Detect_Flag
The same as for sb_detect_flag but after deblending has been performed to account for contamination of the source counts from very nearby sources (see Section 2.4 of the reference paper, and Section 2.3.2 of Mullaney et al. 2015, ApJ, 808, 184M). Deblending only affects a very small fraction of the overall sample (e.g., see Section 2.4 of the reference paper).

DB_HB_Detect_Flag
The same as for hb_detect_flag but after deblending has been performed to account for contamination of the source counts from very nearby sources (see Section 2.4 of the reference paper, and Section 2.3.2 of Mullaney et al. 2015, ApJ, 808, 184M). Deblending only affects a very small fraction of the overall sample (e.g., see Section 2.4 of the reference paper).

DB_FB_Detect_Flag
The same as for fb_detect_flag but after deblending has been performed to account for contamination of the source counts from very nearby sources (see Section 2.4 of the reference paper, and Section 2.3.2 of Mullaney et al. 2015, ApJ, 808, 184M). Deblending only affects a very small fraction of the overall sample (e.g., see Section 2.4 of the reference paper).

Log_SB_False_Prob
The logarithm of the false probability (PFalse) of the NuSTAR-detected source, for the soft (3-8 keV) energy band (see Section 2.3 of the reference paper).

Log_HB_False_Prob
The logarithm of the false probability (PFalse) of the NuSTAR-detected source, for the hard (8-24 keV) energy band (see Section 2.3 of the reference paper).

Log_FB_False_Prob
The logarithm of the false probability (PFalse) of the NuSTAR-detected source, for the full (3-24 keV) energy band (see Section 2.3 of the reference paper).

Log_DB_SB_False_Prob
The same as for log_sb_false_prob but after deblending has been performed to account for contamination of the source counts from very nearby sources.

Log_DB_HB_False_Prob
The same as for log_hb_false_prob but after deblending has been performed to account for contamination of the source counts from very nearby sources.

Log_DB_FB_False_Prob
The same as for log_fb_false_prob but after deblending has been performed to account for contamination of the source counts from very nearby sources.

DB_Detect_Flag
A binary flag indicating whether the NuSTAR-detected source remains significant after deblending, in at least one of the three standard energy bands.

SB_Counts
The soft-band (3-8 keV) total counts in the source (i.e., all counts within the source aperture). This photometric quantity is calculated at the indicated source coordinates using a source aperture of 30 arcseconds radius (see Section 2.4 of the reference paper). The value is non-aperture-corrected , i.e., it correspond to the 30-arcsecond value, and has not been corrected to the full PSF values.

SB_Counts_Error
The 84% confidence level uncertainty in the total soft-band (3-8 keV) counts in the source.

SB_Bck_Counts
The estimated number of background counts in the soft band scaled to the source aperture.

SB_Net_Counts
The net (background-subtracted) soft-band (3-8 keV) counts in the source. This photometric quantity is calculated at the indicated source coordinates using a source aperture of 30 arcseconds radius (see Section 2.4 of the reference paper). The value is non-aperture-corrected , i.e., it correspond to the 30-arcsecond value, and has not been corrected to the full PSF values. For sources not detected in this band (indicated by having a value of -99.000 for the associated error parameter), the quoted value corresponds to the 90% confidence level upper limit.

SB_Net_Counts_Error
The 84% confidence level uncertainty in the net soft-band (3-8 keV) source counts. If the corresponding counts quantity is an upper limit rather than a detection, this error is set to -99.000.

HB_Counts
The hard-band (8-24 keV) total counts (i.e., all counts within the source aperture). This photometric quantity is calculated at the indicated source coordinates using a source aperture of 30 arcseconds radius (see Section 2.4 of the reference paper). The value is non-aperture-corrected , i.e., it correspond to the 30-arcdecond value, and has not been corrected to the full PSF values.

HB_Counts_Error
The 84% confidence level uncertainty in the total hard-band (8-24 keV) counts in the source.

HB_Bck_Counts
The estimated number of background counts in the hard band scaled to the source aperture.

HB_Net_Counts
The net (background-subtracted) hard-band (8-24 keV) counts in the source. This photometric quantity is calculated at the indicated source coordinates using a source aperture of 30 arcseconds radius (see Section 2.4 of the reference paper). The value is non-aperture-corrected , i.e., it correspond to the 30-arcsecond value, and has not been corrected to the full PSF values. For sources not detected in this band (indicated by having a value of -99.000 for the associated error parameter), the quoted value corresponds to the 90% confidence level upper limit.

HB_Net_Counts_Error
The 84% confidence level uncertainty in the net hard-band (8-24 keV) source counts. If the corresponding counts quantity is an upper limit rather than a detection, this error is set to -99.000.

FB_Counts
This photometric quantity is calculated at the indicated source coordinates using a source aperture of 30 arcseconds radius (see Section 2.4 of the reference paper). The value is non-aperture-corrected , i.e., it correspond to the 30-arcdecond value, and has not been corrected to the full PSF values. This particular parameter is the full-band (3-24 keV) total counts (i.e., all counts within the source aperture).

FB_Counts_Error
The 84% confidence level uncertainty in the total full-band (3-24 keV) counts in the source.

FB_Bck_Counts
The estimated number of background counts in the full band scaled to the source aperture.

FB_Net_Counts
The net (background-subtracted) full-band (3-24 keV) counts in the source. This photometric quantity is calculated at the indicated source coordinates using a source aperture of 30 arcseconds radius (see Section 2.4 of the reference paper). The value is non-aperture-corrected , i.e., it correspond to the 30-arcsecond value, and has not been corrected to the full PSF values. For sources not detected in this band (indicated by having a value of -99.000 for the associated error parameter), the quoted value corresponds to the 90% confidence level upper limit.

FB_Net_Counts_Error
The 84% confidence level uncertainty in the net full-band (3-24 keV) source counts. If the corresponding counts quantity is an upper limit rather than a detection, this error is set to -99.000.

DB_SB_Counts
The same as for sb_counts but after deblending has been performed to account for contamination of the source counts from very nearby sources (see Section 2.4 of the reference paper, and Section 2.3.2 of Mullaney et al. 2015, ApJ, 808, 184M).

DB_SB_Counts_Error
The 84% confidence level uncertainty in the total deblended soft-band (3-8 keV) counts in the source. If the corresponding counts quantity is an upper limit rather than a detection, this error is set to -99.000.

DB_SB_Net_Counts
The same as for sb_net_counts but after deblending has been performed to account for contamination of the source counts from very nearby sources (see Section 2.4 of the reference paper, and Section 2.3.2 of Mullaney et al. 2015, ApJ, 808, 184M). For sources not detected in this band (indicated by having a value of -99.000 for the associated error parameter), the quoted value corresponds to the 90% confidence level upper limit.

DB_SB_Net_Counts_Error
The 84% confidence level uncertainty in the net soft-band (3-8 keV) source counts. If the corresponding counts quantity is an upper limit rather than a detection, this error is set to -99.000.

DB_HB_Counts
The same as for hb_counts but after deblending has been performed to account for contamination of the source counts from very nearby sources (see Section 2.4 of the reference paper, and Section 2.3.2 of Mullaney et al. 2015, ApJ, 808, 184M).

DB_HB_Counts_Error
The 84% confidence level uncertainty in the total deblended hard-band (8-24 keV) counts in the source.

DB_HB_Net_Counts
The same as for hb_net_counts but after deblending has been performed to account for contamination of the source counts from very nearby sources (see Section 2.4 of the reference paper, and Section 2.3.2 of Mullaney et al. 2015, ApJ, 808, 184M). For sources not detected in this band (indicated by having a value of -99.000 for the associated error parameter), the quoted value corresponds to the 90% confidence level upper limit.

DB_HB_Net_Counts_Error
The 84% confidence level uncertainty in the net hard-band (8-24 keV) source counts. If the corresponding counts quantity is an upper limit rather than a detection, this error is set to -99.000.

DB_FB_Counts
The same as for fb_counts but after deblending has been performed to account for contamination of the source counts from very nearby sources (see Section 2.4 of the reference paper, and Section 2.3.2 of Mullaney et al. 2015, ApJ, 808, 184M).

DB_FB_Counts_Error
The 84% confidence level uncertainty in the total deblended full-band (3-24 keV) counts in the source.

DB_FB_Net_Counts
The same as for fb_net_counts but after deblending has been performed to account for contamination of the source counts from very nearby sources (see Section 2.4 of the reference paper, and Section 2.3.2 of Mullaney et al. 2015, ApJ, 808, 184M). For sources not detected in this band (indicated by having a value of -99.000 for the associated error parameter), the quoted value corresponds to the 90% confidence level upper limit.

DB_FB_Net_Counts_Error
The 84% confidence level uncertainty in the net full-band (3-24 keV) source counts. If the corresponding counts quantity is an upper limit rather than a detection, this error is set to -99.000.

SB_Exposure
The average net, vignetting-corrected exposure time, in seconds, at the source coordinates, for the soft energy band. These correspond to the A+B data, so that they should be divided by 2 to obtain the average exposure per FPM.

HB_Exposure
The average net, vignetting-corrected exposure time, in seconds, at the source coordinates, for the hard energy band. These correspond to the A+B data, so that they should be divided by 2 to obtain the average exposure per FPM.

FB_Exposure
The average net, vignetting-corrected exposure time, in seconds, at the source coordinates, for the full energy band. These correspond to the A+B data, so that they should be divided by 2 to obtain the average exposure per FPM.

SB_Rate
The non-aperture-corrected total count rate of the source in the soft band as determined from the corresponding photometric counts (sb_counts) and exposure time (sb_exposure), in ct/s.

SB_Rate_Error
The 84% confidence level uncertainty in the total soft-band (3-8 keV) non-aperture-corrected total count rate of the source, in ct/s.

SB_Bck_Rate
The estimated background count rate in the soft band scaled to the source aperture, in ct/s.

SB_Net_Rate
The net (background-subtracted) soft-band (3-8 keV) count rate of the source, in ct/s. This photometric quantity is calculated at the indicated source coordinates using a source aperture of 30 arcseconds radius (see Section 2.4 of the reference paper). The value is non-aperture-corrected , i.e., it correspond to the 30-arcsecond value, and has not been corrected to the full PSF values. For sources not detected in this band (indicated by having a value of -99.000 for the associated error parameter), the quoted value corresponds to the 90% confidence level upper limit.

SB_Net_Rate_Error
The 84% confidence level uncertainty in the net soft-band (3-8 keV) count rate of the source, in ct/s. If the corresponding count rate is an upper limit rather than a detection, this error is set to -99.000.

HB_Rate
The non-aperture-corrected total count rate of the source in the hard band as determined from the corresponding photometric counts (hb_counts) and exposure time (hb_exposure), in ct/s.

HB_Rate_Error
The 84% confidence level uncertainty in the total hard-band (8-24 keV) non-aperture-corrected total count rate of the source, in ct/s.

HB_Bck_Rate
The estimated background count rate in the hard band scaled to the source aperture, in ct/s.

HB_Net_Rate
The net (background-subtracted) hard-band (8-24 keV) count rate of the source, in ct/s. This photometric quantity is calculated at the indicated source coordinates using a source aperture of 30 arcseconds radius (see Section 2.4 of the reference paper). The value is non-aperture-corrected , i.e., it correspond to the 30-arcsecond value, and has not been corrected to the full PSF values. For sources not detected in this band (indicated by having a value of -99.000 for the associated error parameter), the quoted value corresponds to the 90% confidence level upper limit.

HB_Net_Rate_Error
The 84% confidence level uncertainty in the net hard-band (8-24 keV) count rate of the source, in ct/s. If the corresponding count rate is an upper limit rather than a detection, this error is set to -99.000.

FB_Rate
The non-aperture-corrected total count rate of the source in the full band as determined from the corresponding photometric counts (fb_counts) and exposure time (fb_exposure), in ct/s.

FB_Rate_Error
The 84% confidence level uncertainty in the total full-band (3-24 keV) non-aperture-corrected total count rate of the source, in ct/s.

FB_Bck_Rate
The estimated background count rate in the full band scaled to the source aperture, in ct/s.

FB_Net_Rate
The net (background-subtracted) full-band (3-24 keV) count rate of the source, in ct/s. This photometric quantity is calculated at the indicated source coordinates using a source aperture of 30 arcseconds radius (see Section 2.4 of the reference paper). The value is non-aperture-corrected , i.e., it correspond to the 30-arcsecond value, and has not been corrected to the full PSF values. For sources not detected in this band (indicated by having a value of -99.000 for the associated error parameter), the quoted value corresponds to the 90% confidence level upper limit.

FB_Net_Rate_Error
The 84% confidence level uncertainty in the net full-band (3-24 keV) count rate of the source, in ct/s. If the corresponding count rate is an upper limit rather than a detection, this error is set to -99.000.

DB_SB_Net_Rate
The same as for sb_net_rate but after deblending has been performed to account for contamination of the source counts from very nearby sources (see Section 2.4 of the reference paper, and Section 2.3.2 of Mullaney et al. 2015, ApJ, 808, 184M). For sources not detected in this band (indicated by having a value of -99.000 for the associated error parameter), the quoted value corresponds to the 90% confidence level upper limit.

DB_SB_Net_Rate_Error
The 84% confidence level uncertainty in the net deblended soft-band (3-8 keV) source counts, in ct/s. If the corresponding count rate is an upper limit rather than a detection, this error is set to -99.000.

DB_HB_Net_Rate
The same as for hb_net_rate but after deblending has been performed to account for contamination of the source counts from very nearby sources (see Section 2.4 of the reference paper, and Section 2.3.2 of Mullaney et al. 2015, ApJ, 808, 184M). For sources not detected in this band (indicated by having a value of -99.000 for the associated error parameter), the quoted value corresponds to the 90% confidence level upper limit.

DB_HB_Net_Rate_Error
The 84% confidence level uncertainty in the net deblended hard-band (8-24 keV) source counts, in ct/s. If the corresponding count rate is an upper limit rather than a detection, this error is set to -99.000.

DB_FB_Net_Rate
The same as for fb_net_rate but after deblending has been performed to account for contamination of the source counts from very nearby sources (see Section 2.4 of the reference paper, and Section 2.3.2 of Mullaney et al. 2015, ApJ, 808, 184M). For sources not detected in this band (indicated by having a value of -99.000 for the associated error parameter), the quoted value corresponds to the 90% confidence level upper limit.

DB_FB_Net_Rate_Error
The 84% confidence level uncertainty in the net deblended full-band (3-24 keV) source counts, in ct/s. If the corresponding count rate is an upper limit rather than a detection, this error is set to -99.000.

Band_Ratio
The NuSTAR hard-to-soft band ratio of the source, calculated as the rato of the hard (8-24 keV) to soft (3-8 keV) count rates.

Band_Ratio_Pos_Err
The upper uncertainty in the NuSTAR hard-to-soft band ratio of the source. Upper limits to, lower limits to, and sources with no constraints on the band ratio are flagged with values of -99.00, -88.00, and -77.00 values, respectively, for the associated error quantities.

Band_Ratio_Neg_Err
The lower uncertainty in the NuSTAR hard-to-soft band ratio of the source. Upper limits to, lower limits to, and sources with no constraints on the band ratio are flagged with values of -99.00, -88.00, and -77.00 values, respectively, for the associated error quantities.

Photon_Index
The effective photon index (Gamma) of the source, i.e., the spectral slope of a power-law spectrum that is required to produce the given band ratio. This is calculated for sources with full-band counts Snet > 100, and with a detection in at least one of the soft or hard bands, as discussed in Section 2.4 of the reference paper.

Photon_Index_Pos_Err
The upper uncertainty in the effective photon index (Gamma) of the source. Upper limits to, lower limits to, and sources with no constraints on the effective photon index are flagged with values of -99.00, -88.00, and -77.00 values, respectively, for the associated error quantities.

Photon_Index_Neg_Err
The lower uncertainty in the effective photon index (Gamma) of the source. Upper limits to, lower limits to, and sources with no constraints on the effective photon index are flagged with values of -99.00, -88.00, and -77.00 values, respectively, for the associated error quantities.

SB_Flux
The observed-frame flux of the source in the soft band, after deblending has been performed, in erg s-1 cm-2. To measure fluxes, the authors convert from the deblended 30" soft-band count rates using the conversion factor of 6.7 x 10-11 erg cm-2 s-1. This conversion factor was derived to account for the NuSTAR response, and assumes an unabsorbed power law with a photon index of Gammaeff = 1.8 (typical of AGN detected by NuSTAR; e.g., Alexander et al. 2013, ApJ, 773, 125). The conversion factor returns the aperture-corrected flux, i.e., it is corrected to the 100% encircled-energy fraction of the PSF.

SB_Flux_Error
The 84% confidence level uncertainty in the observed-frame flux of the source in the soft band, after deblending has been performed, in erg s-1 cm-2. If the corresponding flux is an upper limit rather than a detection, this error is set to -99.000.

HB_Flux
The observed-frame flux of the source in the hard band, after deblending has been performed, in erg s-1 cm-2. To measure fluxes, the authors convert from the deblended 30" hard-band count rates using the conversion factor of 13.9 x 10-11 erg cm-2 s-1. This conversion factor was derived to account for the NuSTAR response, and assumes an unabsorbed power law with a photon index of Gammaeff = 1.8 (typical of AGN detected by NuSTAR; e.g., Alexander et al. 2013, ApJ, 773, 125). The conversion factor returns the aperture-corrected flux, i.e., it is corrected to the 100% encircled-energy fraction of the PSF.

HB_Flux_Error
The 84% confidence level uncertainty in the observed-frame flux of the source in the hard band, after deblending has been performed, in erg s-1 cm-2. If the corresponding flux is an upper limit rather than a detection, this error is set to -99.000.

FB_Flux
The observed-frame flux of the source in the full band, after deblending has been performed, in erg s-1 cm-2. To measure fluxes, the authors convert from the deblended 30" full-band count rates using the conversion factor of 9.4 x 10-11 erg cm-2 s-1. This conversion factor was derived to account for the NuSTAR response, and assumes an unabsorbed power law with a photon index of Gammaeff = 1.8 (typical of AGN detected by NuSTAR; e.g., Alexander et al. 2013, ApJ, 773, 125). The conversion factor returns the aperture-corrected flux, i.e., it is corrected to the 100% encircled-energy fraction of the PSF.

FB_Flux_Error
The 84% confidence level uncertainty in the observed-frame flux of the source in the full band, after deblending has been performed, in erg s-1 cm-2. If the corresponding flux is an upper limit rather than a detection, this error is set to -99.000.

Softxray_Ctrpart_Orig
An abbreviated code indicating the origin of the adopted soft (i.e., low energy; < 10 keV) X-ray counterpart, as follows (see Section 3.1 of the reference paper for details of the soft X-ray counterpart matching procedure):

   Code       Reference

   CXO_CSC    Chandra Source Catalog (CSC;  Evans et al. 2010, ApJS, 189, 37);
   XMM_3XMM   3rd XMM-Newton serendipitous source catalog
              (3XMM; Watson et al. 2009, A&A, 493, 339;
              Rosen et al. 2016, A&A, 590, A1);
   CXO_MAN    Sources manually identified using archival Chandra data;
   XMM_MAN    Sources manually identified using archival XMM-Newton data;
   XRT_MAN    Sources manually identified using archival Swift XRT data.
  

Softxray_Ctrpart_RA
The Right Ascension of the soft X-ray counterpart in the selected equinox. This was given in J2000 decimal degree coordinates to a precision of 10-6 degrees in the original table.

Softxray_Ctrpart_Dec
The Declination of the soft X-ray counterpart in the selected equinox. This was given in J2000 decimal degree coordinates to a precision of 10-6 degrees in the original table.

Softxray_Nustar_Offset
The angular offset between the NuSTAR position of the source and its soft X-ray counterpart position, in arcseconds.

Softxray_Flux
The observed-frame 3-8 keV flux of the soft X-ray ounterpart, in erg s-1 cm-2, for sources with counterparts in the CSC and 3XMM catalogs. For CSC sources, the authors convert to the 3-8 keV flux from the 2-7 keV flux using a conversion factor of 0.83, and for the 3XMM sources, they convert to the 3-8 keV flux from the 4.5-12 keV keV flux using a conversion factor of 0.92.

Softxray_Tot_Flux
The total combined 3-8 keV X-ray flux of all soft X-ray (3XMM or CSC) sources within 30 arcseconds of the NuSTAR position, in erg s-1 cm-2.

WISE_Ctrpart_RA
The Right Ascension of the WISE infrared counterpart in the selected equinox. This was given in J2000 decimal degree coordinates to a precision of 10-6 degrees in the original table.

WISE_Ctrpart_Dec
The Declination of the WISE infrared counterpart in the selected equinox. This was given in J2000 decimal degree coordinates to a precision of 10-6 degrees in the original table.

WISE_Nustar_Offset
The angular offset between the NuSTAR position of the source and its WISE counterpart position, in arcseconds.

W1_Mag
The WISE W1 (3.4-micron) band profile-fit Vega magnitude of the infared counterpart to the NuSTAR source (or upper limit thereof if the associated error parameter is null).

W1_Mag_Error
The uncertainty in the corresponding WISE magnitude of the infared counterpart to the NuSTAR source.

W2_Mag
The WISE W2 (4.6-micron) band profile-fit Vega magnitude of the infared counterpart to the NuSTAR source (or upper limit thereof if the associated error parameter is null).

W2_Mag_Error
The uncertainty in the corresponding WISE magnitude of the infared counterpart to the NuSTAR source.

W3_Mag
The WISE W3 (12-micron) band profile-fit Vega magnitude of the infared counterpart to the NuSTAR source (or upper limit thereof if the associated error parameter is null).

W3_Mag_Error
The uncertainty in the corresponding WISE magnitude of the infared counterpart to the NuSTAR source.

W4_Mag
The WISE W4 (22-micron) band profile-fit Vega magnitude of the infared counterpart to the NuSTAR source (or upper limit thereof if the associated error parameter is null).

W4_Mag_Error
The uncertainty in the corresponding WISE magnitude of the infared counterpart to the NuSTAR source.

Opt_Ctrpart_Orig
An abbreviated code indicating the origin of the adopted optical or other wavelength counterpart, as follows (see Section 3.2 of the reference paper for details of the optical counterpart matching procedure):

   Code      Reference

   SDSS      Sources with soft X-ray counterparts and successful matches in
             the SDSS DR7 catalog (York et al. 2000, AJ, 120, 1579);
   USNO      Sources with soft X-ray counterparts and successful
             matches in the USNOB1 catalog (Monet et al. 2003, AJ, 125, 948);
   MAN       Sources with a soft X-ray counterpart and a corresponding optical
             counterpart manually identified in the available optical coverage.
   SDSS_WISE Cases where there is no soft X-ray counterpart to the NuSTAR;
             position, but a WISE AGN candidate is identified within the NuSTAR
             error circle and successfully matched to the SDSS DR7 catalog
             (these are mainly used as candidates for spectroscopic followup);
   USNO_WISE Cases where there is no soft X-ray counterpart to the NuSTAR;
             position, but a WISE AGN candidate is identified within the NuSTAR
             error circle and successfully matched to the USNOB1 catalog
             (these are mainly used as candidates for spectroscopic followup);
  

Opt_RA
The Right Ascension of the optical or other wavelength counterpart in the selected equinox, for the sources with SDSS DR7 and USNOB1 matches. This was given in J2000 decimal degree coordinates to a precision of 10-8 degrees in the original table.

Opt_Dec
The Declination of the optical or other wavelength counterpart in the selected equinox, for the sources with SDSS DR7 and USNOB1 matches. This was given in J2000 decimal degree coordinates to a precision of 10-8 degrees in the original table.

Opt_Nustar_Offset
The angular offset between the NuSTAR position of the source and its optical or other wavelength counterpart position, in arcseconds.

Rmag
The R-band magnitude of the optical counterpart to the NuSTAR source, in Vega magnitudes. For the SDSS DR7 matches, this is calculated as R = r - 0.16. For the USNOB1 matches, this is taken as the mean of the two independent photographic plate measurements, R1mag and R2mag. For the manual identifications, the magnitude is taken from another optical catalog or manually determined from the imaging data.

Redshift
The spectroscopic redshift of the NuSTAR source. The large majority of the redshifts were obtained through the authors' own campaign of ground-based spectroscopic follow-up of NuSTAR serendipitous survey sources (see Section 3.3.1 of the reference paper).

RF_Hardxray_Luminosity
The rest-frame 10-40 keV luminosity of the NuSTAR source, in erg s-1, estimated from the quoted X-ray fluxes, following the procedure outlined in Section 2.4 of the reference paper. Negative luminosity values indicate upper limits. The luminosities are observed values, uncorrected for any absorption along the line of sight. The intrinsic luminosities may therefore be higher, for highly absorbed AGN.

Primary_Assoc_Flag
A binary flag that is set to 1 for the few sources that show evidence for being associated with the primary science targets of their respective NuSTAR observations according to the definition in Section 2.3 of the reference paper, i.e., having a redshift within 5% of the primary science target redshift value (Delta(cz) < 0.05cz).

Aird2015_Source_Flag
A binary flag that is set to 1 for the sources used in the Aird et al. (2015, ApJ, 815, 66) study.


Contact Person

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

Page Author: Browse Software Development Team
Last Modified: 12-Jul-2017