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CHPNGPTSRC - Chandra Nearby Galaxies Point Source Catalog

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Overview

The authors have analyzed Chandra ACIS observations of 32 nearby spiral and elliptical galaxies. The properties (e.g., counts in 3 energy bands, hardness ratios and inferred X-ray luminosities) of the 1441 X-ray point sources that were detected in these galaxies are listed in this table. The total point-source X-ray (0.3 - 8.0 keV) luminosity L_XP is found to be well correlated with the B-band, K-band, and FIR+UV luminosities of spiral host galaxies, and is well correlated with the B-band and K-band luminosities of elliptical galaxies. This suggests an intimate connection between L_XP and both the old and the young stellar populations, for which K and FIR+UV luminosities are reasonable proxies for the galaxy mass and the star formation rate (SFR).

Catalog Bibcode

2004ApJ...602..231C

References

Old and young X-ray point source populations in nearby galaxies.
    Colbert E.J.M., Heckman T.M., Ptak A.F., Strickland D.K., Weaver K.A.
   <Astrophys. J., 602, 231-248 (2004)>
   =2004ApJ...602..231C

Provenance

This table was created by the HEASARC in October 2006 based on CDS table J/ApJ/602/231/tablea1.dat

Parameters

Name
The recommended X-ray source designation using the CHP2004 prefix and the J2000 coordinates for the object.

Galaxy_Name
The X-ray source host galaxy name.

RA
The Right Ascension of the X-ray source in the selected equinox. This was given in J2000.0 coordinates to a precision of 0.1 seconds of time in the original table.

Dec
The Declination of the X-ray source in the selected equinox. This was given in J2000.0 coordinates to a precision of 1 arcsecond in the original table.

LII
The Galactic Longitude of the X-ray source.

BII
The Galactic Latitude of the X-ray source.

ACIS_CCD
The number of the ACIS CCD with which the X-ray source was detected: CCDs 5 and 7 are back-illuminated, while the other CCDs are front-illuminated (see section 3.1 of the published paper).

Log_Lx
The logarithm of the 0.3 - 8 keV X-ray luminosity of the X-ray source, in units of erg/s, assuming the galaxy distances as listed in Table 2 and exposure times as listed in Table 1 of the published paper. See section 3.1 of the published paper for details about the assumed spectrum.

HB_Counts
The net observed counts in the X-ray source for the hard band H (2.0 - 8.0 keV).

HB_Counts_Error
The uncertainty in the X-ray source hard-band counts.

MB_Counts
The net observed counts in the X-ray source for the medium band M (1.0 - 2.0 keV).

MB_Counts_Error
The uncertainty in the X-ray source medium-band counts.

SB_Counts
The net observed counts in the X-ray source for the soft band S (0.3 - 1.0 keV).

SB_Counts_Error
The uncertainty in the X-ray source soft-band counts.

HR_1
The hardness ratio of the X-ray source for the hard and medium bands, (H-M)/(H+M), in the back-illuminated (BI) CCD 7. Hardness ratios for sources detected on the front-illuminated CCDs were transformed to the corresponding ratio for the BI CCDs using effective area curves, quantum efficiency curves, and filter transmission curves provided by the Chandra X-Ray Center.

HR_1_Error
The uncertainty in the hard to medium hardness ratio of the X-ray source. Uncertainties are not provided when no net counts were detected in one of the energy bands.

HR_2
The hardness ratio of the X-ray source for the medium and soft bands, (M-S)/(M+S), in the back-illuminated (BI) CCD 7. Hardness ratios for sources detected on the front-illuminated CCDs were transformed to the corresponding ratio for the BI CCDs using effective area curves, quantum efficiency curves, and filter transmission curves provided by the Chandra X-Ray Center.

HR_2_Error
The uncertainty in the medium to soft hardness ratio of the X-ray source. Uncertainties are not provided when no net counts were detected in one of the energy bands.


Contact Person

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

Page Author: Browse Software Development Team
Last Modified: 18-Oct-2006