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SDSSS82CXO - Sloan Digital Sky Survey Stripe 82 Chandra Source Match Catalog

HEASARC
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Overview

The authors have analyzed the XMM-Newton and Chandra data overlapping ~ 16.5 deg2 of the Sloan Digital Sky Survey Stripe 82, including ~ 4.6 deg2 of proprietary XMM-Newton data that they present herein. In total, 3,362 unique X-ray sources are detected at high significance. The authors derive the XMM-Newton number counts and compare them with their previously reported Chandra log N - log S relations and other X-ray surveys.

The Stripe 82 X-ray source lists have been matched to multiwavelength catalogs using a maximum likelihood estimator (MLE) algorithm. The authors discovered the highest redshift (z = 5.86) quasar yet identified in an X-ray survey. They find 2.5 times more high-luminosity (LX > 1045 erg/s) AGN than the smaller area Chandra and XMM-Newton survey of COSMOS and 1.3 times as many identified by XBootes. Comparing the high-luminosity active galactic nuclei (AGN) the authors have identified with those predicted by population synthesis models, their results suggest that this AGN population is a more important component of cosmic black hole growth than previously appreciated. Approximately a third of the X-ray sources not detected in the optical are identified in the infrared, making them candidates for the elusive population of obscured high-luminosity AGN in the early universe.

In this study, XMM-Newton and Chandra X-ray sources were matched with the SDSS, WISE, UKIDSS, and GALEX catalogs using the maximum likelihood estimator (MLE). X-ray sources were matched to FIRST sources using a nearest neighbor matching scheme. This table contains the list of 1,146 Chandra sources detected in the SDSS Stripe 82. A related table SDSSS82XMM contains the list of 2,358 XMM-Newton sources detected in the SDSS Stripe 82.


Catalog Bibcode

2013MNRAS.436.3581L

References

Finding rare AGN: XMM-Newton and Chandra observations of SDSS Stripe 82.
    LaMassa S.M., Urry C.M., Cappelluti N., Civano F., Ranalli P., Glikman E.,
    Treister E., Richards G., Ballantyne D., Stern D., Comastri A.,
    Cardamone C., Schawinski K., Bohringer H., Chon G., Murray S.S., Green P.,
    Nandra K.
   <Mon. Not. R. Astron. Soc., 436, 3581-3601 (2013)>
   =2013MNRAS.436.3581L    (SIMBAD/NED BibCode)

Provenance

This table was created by the HEASARC in April 2014 based on the the CDS Catalog J/MNRAS/436/3581/ file chands82.dat.

Parameters

Source_Number
A unique identification number for each Chandra source in this catalog, the Chandra Source Catalog 'Master Source Identifier', MSID.

Name
The HEASARC has created a source designation for entries in this catalog following the standard precepts from the Dictionary of Nomenclature of Celestial Objects, using the prefix '[LUC2013] CXO' (for LaMassa, Urry, Cappelluti, 2013 Chandra X-ray Observatory source) and the source number.

ObsID
The Chandra observation identification (ObsID) number for the observation in which the source was detected.

RA
The Right Ascension of the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.01 degrees (36 arcseconds) in the original table.

Dec
The Declination of the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.01 degrees (36 arcseconds) in the original table.

LII
The Galactic Longitude of the Chandra source.

BII
The Galactic Latitude of the Chandra source.

Error_Radius
The positional uncertainty of the Chandra source position, in arcseconds.

CXO_Nn_Offset
The angular distance from this Chandra source to the nearest other Chandra source, in arcseconds.

SB_Flux
The soft-band (0.5-2 keV) flux of the Chandra source, in erg cm-2 s-1. The flux is set to null if the source has a significance of < 4.5 sigma in this band.

SB_Flux_Upper
The higher bound on the soft-band (0.5-2 keV) flux of the Chandra source, in erg cm-2 s-1.

SB_Flux_Lower
The lower bound on the soft-band (0.5-2 keV) flux of the Chandra source, in erg cm-2 s-1.

HB_Flux
The hard-band (2-7 keV) flux of the Chandra source, in erg cm-2 s-1. The flux is set to null if the source has a significance of < 4.5 sigma in this band.

HB_Flux_Upper
The higher bound on the hard-band (2-7 keV) flux of the Chandra source, in erg cm-2 s-1.

HB_Flux_Lower
The lower bound on the hard-band (2-7 keV) flux of the Chandra source, in erg cm-2 s-1.

FB_Flux
The full-band (0.5-7 keV) flux of the Chandra source, in erg cm-2 s-1. The flux is set to null if the source has a significance of < 4.5 sigma in this band.

FB_Flux_Upper
The higher bound on the full-band (0.5-7 keV) flux of the Chandra source, in erg cm-2 s-1.

FB_Flux_Lower
The lower bound on the full-band (0.5-7 keV) flux of the Chandra source, in erg cm-2 s-1.

Log_SB_Lx
The logarithm of the soft-band (0.5-2 keV) X-ray luminosity of the source, in erg s-1. This is given if the source was detected in this band and it redshift is known.

Log_HB_Lx
The logarithm of the hard-band (2-7 keV) X-ray luminosity of the source, in erg s-1. This is given if the source was detected in this band and it redshift is known.

Log_FB_Lx
The logarithm of the full-band (0.5-7 keV) X-ray luminosity of the source, in erg s-1. This is given if the source was detected in this band and it redshift is known.

XMM_Flag
This cross-correlation flag parameter is set to 'Y' to indicate that the Chandra source has a counterpart source in the SDSS Stripe 82 XMM-Newton Catalog (the HEASARC SDSSS82XMM table), else is set to 'N'.

Lns_Rem_Flag
This flag parameter is set to 'Y' to indicate that the Chandra source was not part of the logN - logS relation published in LaMassa et a (2013, MNRAS, 432, 1351), else is set to 'N'.

SDSS_Rej_Flag
This flag parameter is set to 'Y' to indicate that the SDSS counterpart was found but was rejected due to poor photometry, else is set to 'N'

SDSS_Object_ID
The SDSS object identification number (ObjID) of the SDSS counterpart to the Chandra source.

SDSS_RA
The Right Ascension of the SDSS counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

SDSS_Dec
The Declination of the SDSS counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

SDSS_CXO_Rel
The reliability from the Maximum Likelihood Estimate (MLE) of the SDSS source match to the Chandra source. The threshold for counterpart selection is discussed in Appendix A of the reference paper.

SDSS_CXO_Offset
The angular distance between the Chandra source and its SDSS counterpart, in arcseconds.

Umag
The u magnitude of the SDSS counterpart to the Chandra source.

Umag_Error
The uncertainty in the corresponding magnitude of the SDSS counterpart to the Chandra source.

Gmag
The g magnitude of the SDSS counterpart to the Chandra source.

Gmag_Error
The uncertainty in the corresponding magnitude of the SDSS counterpart to the Chandra source.

Rmag
The r magnitude of the SDSS counterpart to the Chandra source.

Rmag_Error
The uncertainty in the corresponding magnitude of the SDSS counterpart to the Chandra source.

Imag
The i magnitude of the SDSS counterpart to the Chandra source.

Imag_Error
The uncertainty in the corresponding magnitude of the SDSS counterpart to the Chandra source.

Zmag
The z magnitude of the SDSS counterpart to the Chandra source.

Zmag_Error
The uncertainty in the corresponding magnitude of the SDSS counterpart to the Chandra source.

SDSS_Spect_Object_ID
The SDSS spectroscopic object identification number (SpecObjID) of the SDSS counterpart to the Chandra source.

Spect_Class
The optical spectroscopic class (STAR, GALAXY or QSO) of the source, if available.

Redshift
The spectroscopic redshift of the source.

Ref_Redshift
The source of the spectroscopic redshift coded as follows:

             0 = SDSS
             1 = 2SLAQ
             2 = WiggleZ
             3 = DEEP2
             4 = SDSS spectrum re-fit/verified by the authors
  

WISE_Name
The J2000.0 position-based source designation (WISE JHHMMSS.ss+DDMMSS.s) of the WISE counterpart to the Chandra source.

WISE_RA
The Right Ascension of the WISE counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.01 degrees (36 arcseconds) in the original table.

WISE_Dec
The Declination of the WISE counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.01 degrees (36 arcseconds) in the original table.

WISE_RA_Error
The positional uncertainty of the WISE counterpart position in Right Ascension, in arcseconds.

WISE_Dec_Error
The positional uncertainty of the WISE counterpart position in Declination, in arcseconds.

WISE_CXO_Rel
The reliability from the Maximum Likelihood Estimate (MLE) of the WISE source match to the Chandra source. The threshold for counterpart selection is discussed in Appendix A of the reference paper.

WISE_CXO_Offset
The angular distance between the Chandra source and its WISE counterpart, in arcseconds.

W1_Mag
The W1 (3.4 um) magnitude of the WISE counterpart to the Chandra source. This magnitude is from profile-fitting photometry unless the value of the WISE_ext_flag parameter is set to 'Y', in which case the magnitudes are associated with elliptical apertures.

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

W1_Mag_SNR
The Signal-to-Noise ratio (SNR) of the WISE counterpart detection in the W1 band. Any WISE magnitudes with SNR < 2 are upper limits.

W2_Mag
The W2 (4.6 um) magnitude of the WISE counterpart to the Chandra source. This magnitude is from profile-fitting photometry unless the value of the WISE_ext_flag parameter is set to 'Y', in which case the magnitudes are associated with elliptical apertures.

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

W2_Mag_SNR
The Signal-to-Noise ratio (SNR) of the WISE counterpart detection in the W2 band. Any WISE magnitudes with SNR < 2 are upper limits.

W3_Mag
The W3 (12 um) magnitude of the WISE counterpart to the Chandra source. This magnitude is from profile-fitting photometry unless the value of the WISE_ext_flag parameter is set to 'Y', in which case the magnitudes are associated with elliptical apertures.

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

W3_Mag_SNR
The Signal-to-Noise ratio (SNR) of the WISE counterpart detection in the W3 band. Any WISE magnitudes with SNR < 2 are upper limits.

W4_Mag
The W4 (22 um) magnitude of the WISE counterpart to the Chandra source. This magnitude is from profile-fitting photometry unless the value of the WISE_ext_flag parameter is set to 'Y', in which case the magnitudes are associated with elliptical apertures.

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

W4_Mag_SNR
The Signal-to-Noise ratio (SNR) of the WISE counterpart detection in the W4 band. Any WISE magnitudes with SNR < 2 are upper limits.

WISE_Ext_Flag
This flag parameter is set to 'Y' to indicate that the WISE counterpart to the Chandra source is extended, else is set to 'N'.

WISE_Rej_Flag
This flag parameter is set to 'Y' to indicate that the WISE counterpart was found but was rejected due to poor photometry, else is set to 'N'

UKIDSS_ID
The UKIDSS identification of the infrared counterpart to the Chandra source.

UKIDSS_RA
The Right Ascension of the UKIDSS counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.01 degrees (36 arcseconds) in the original table.

UKIDSS_Dec
The Declination of the UKIDSS counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.01 degrees (36 arcseconds) in the original table.

UKIDSS_CXO_Rel
The reliability from the Maximum Likelihood Estimate (MLE) of the UKIDSS source match to the Chandra source. The threshold for counterpart selection is discussed in Appendix A of the reference paper.

UKIDSS_CXO_Offset
The angular distance between the Chandra source and its UKIDSS counterpart, in arcseconds.

Ymag
The Y magnitude (1.02 um) of the UKIDSS counterpart to the Chandra source.

Ymag_Error
The uncertainty in the corresponding magnitude of the UKIDSS counterpart to the Chandra source.

Hmag
The H magnitude of the UKIDSS counterpart to the Chandra source.

Hmag_Error
The uncertainty in the corresponding magnitude of the UKIDSS counterpart to the Chandra source.

Jmag
The J magnitude of the UKIDSS counterpart to the Chandra source.

Jmag_Error
The uncertainty in the corresponding magnitude of the UKIDSS counterpart to the Chandra source.

Kmag
The K magnitude of the UKIDSS counterpart to the Chandra source.

Kmag_Error
The uncertainty in the corresponding magnitude of the UKIDSS counterpart to the Chandra source.

UKIDSS_Rej_Flag
This flag parameter is set to 'Y' to indicate that the UKIDSS counterpart was found but was rejected due to poor photometry, else is set to 'N'.

GALEX_ID
The GALEX object identification number (ObjID) of the GALEX counterpart to the Chandra source.

GALEX_RA
The Right Ascension of the GALEX counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.01 degrees (36 arcseconds) in the original table.

GALEX_Dec
The Declination of the GALEX counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.01 degrees (36 arcseconds) in the original table.

GALEX_NUV_Error_Radius
The positional uncertainty of the GALEX NUV (1771-2831 Angstrom) counterpart to the Chandra source, in arcseconds.

GALEX_FUV_Error_Radius
The positional uncertainty of the GALEX FUV (1344-1786 Angstrom) counterpart to the Chandra source, in arcseconds.

GALEX_CXO_Rel
The reliability from the Maximum Likelihood Estimate (MLE) of the GALEX source match to the Chandra source. The threshold for counterpart selection is discussed in Appendix A of the reference paper.

GALEX_CXO_Offset
The angular distance between the Chandra source and its GALEX counterpart, in arcseconds.

NUV_Mag
The NUV (1771-2831 Angstrom) magnitude of the GALEX counterpart to the Chandra source.

NUV_Mag_Error
The uncertainty in the corresponding magnitude of the GALEX counterpart to the Chandra source.

FUV_Mag
The FUV (1344-1786 Angstrom) magnitude of the GALEX counterpart to the Chandra source.

FUV_Mag_Error
The uncertainty in the corresponding magnitude of the GALEX counterpart to the Chandra source.

First_Name
The name of the FIRST counterpart to the Chandra source, viz., FIRST JHHMMSS.s+DDMMSS.

First_RA
The Right Ascension of the FIRST counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.01 degrees (36 arcseconds) in the original table.

First_Dec
The Declination of the FIRST counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.01 degrees (36 arcseconds) in the original table.

First_CXO_Offset
The angular distance between the Chandra source and its FIRST counterpart, in arcseconds.

Flux_20_cm
The integrated 1.4-GHz flux density of the FIRST counterpart to the Chandra source, in mJy.

Flux_20_cm_Error
The uncertainty in the integrated 1.4-GHz flux density of the FIRST counterpart to the Chandra source, in mJy.

Class
The HEASARC Browse object classification of the source, based on the value of the spect_class parameter.


Contact Person

Questions regarding the SDSSS82CXO database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 21-Apr-2014