Sloan Digital Sky Survey Stripe 82 Chandra Source Match Catalog

Sloan Digital Sky Survey Stripe 82 Chandra Source Match Catalog SDSSS82CXO ivo://nasa.heasarc/sdsss82cxo NASA/GSFC HEASARC LaMassa et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains some of the data from the latest release of the Stripe 82 X-ray (82X) survey point-source catalog, which currently covers 31.3 deg2 of the Sloan Digital Sky Survey (SDSS) Stripe 82 Legacy field. In total, 6,181 unique X-ray sources are significantly detected with XMM-Newton (> 5 sigma) and Chandra (> 4.5 sigma). This 31 deg2 catalog release includes data from XMM-Newton cycle AO 13, which approximately doubled the Stripe 82X survey area. The flux limits of the Stripe 82X survey are 8.7 x 10-16 erg s-1 cm-2, 4.7 x 10-15 erg s-1 cm-2, and 2.1 x 10-15 erg s-1 cm^=2^ in the soft (0.5 - 2.0 keV), hard (2 - 10 keV), and full (0.5 - 10 keV) bands, respectively, with approximate half-area survey flux limits of 5.4 x 10-15 erg s-1 cm-2, 2.9 x 10-14 erg s-1 cm-2, and 1.7 x 10-14 erg s-1 cm-2, respectively. The authors matched the X-ray source lists to available multi-wavelength catalogs, including updated matches to the previous release of the Stripe 82X survey; 88% of the sample is matched to a multi-wavelength counterpart. Due to the wide area of Stripe 82X and rich ancillary multi-wavelength data, including coadded SDSS photometry, mid-infrared WISE coverage, near-infrared coverage from UKIDSS and VISTA Hemisphere Survey (VHS), ultraviolet coverage from GALEX, radio coverage from FIRST, and far-infrared coverage from Herschel, as well as existing ~30% optical spectroscopic completeness, this study is beginning to uncover rare objects, such as obscured high-luminosity active galactic nuclei at high redshift. The Stripe 82X point source catalog is a valuable data set for constraining how this population grows and evolves, as well as for studying how they interact with the galaxies in which they live. The authors derive the XMM-Newton number counts distribution and compare it with their previously reported Chandra log N - log S relations and other X-ray surveys. Throughout this study, the authors adopt a cosmology of H0 = 70 km s-1 Mpc-1, OmegaM = 0.27, and Lambda = 0.73. The XMM-Newton and Chandra X-ray sources were matched with sources in the SDSS, WISE, UKIDSS, VHS, GALEX, FIRST and Herschel databases using the maximum likelihood estimator (MLE) method, as discussed in detail in Section 4 of the reference paper. This table contains the list of 1,146 Chandra sources detected in the SDSS Stripe 82. A related table SDSSS82XMM contains the list of 5,220 XMM-Newton sources detected in the SDSS Stripe 82. This table was initially created by the HEASARC in April 2014 based on the machine-readable version of the table ('Properties of SDSS Quasars Detected by Chandra') described in Appendix B1 of the reference paper (LaMassa et al. 2013, MNRAS, 436, 3581) which was obtained from the CDS (their catalog J/MNRAS/436/3581/ file chands82.dat). The present version was created by the HEASARC in January 2017 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJ/817/172">CDS Catalog J/ApJ/817/172</a> file chandra.dat. This is a service provided by NASA HEASARC . 2016ApJ...817..172L https://heasarc.gsfc.nasa.gov/W3Browse/all/sdsss82cxo.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=sdsss82cxo& GET text/xml 180 99999 true 21.435 -1.456 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=sdsss82cxo GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_sdsss82cxo&Action=More+Options&Action=Parameter+Search&ConeAdd=1 SDSS 0.0166666666666667 Infrared Optical Radio UV X-ray public sdsss82cxo Sloan Digital Sky Survey Stripe 82 Chandra Source Match Catalog source_number Sequential Identification Number for Each Source in the Catalog meta.id;src int nullable name Source Designation meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable error_radius Chandra Positional Error arcsec stat.error;pos double nullable fb_flux_lower Lower Bound on the Full Flux erg/s/cm^2 phot.flux;em.X-ray;stat.min double nullable fb_flux Full (0.5-10keV) Flux erg/s/cm^2 phot.flux;em.X-ray double nullable fb_flux_upper Upper Bound on the Full Flux erg/s/cm^2 phot.flux;em.X-ray;stat.max double nullable gmag SDSS g Magnitude mag phot.mag;em.opt double nullable gmag_error SDSS g Magnitude Error mag stat.error;phot.mag;em.opt double nullable w1_mag WISE W1 Magnitude mag phot.mag;em.IR.3-4um double nullable w1_mag_error WISE W1 Error mag stat.error;phot.mag;em.IR.3-4um double nullable sdss_object_id SDSS Object Identification Number (ObjID) meta.id;src;em.opt char nullable flux_250_um Herschel 250um Flux Density mJy phot.flux.density;em.mm.750-1500GHz double nullable flux_20_cm FIRST 1.4-GHz Flux Density mJy phot.flux.density;em.radio.750-1500MHz double nullable vhs_kmag VHS K Magnitude mag phot.mag;em.IR.K double nullable xmm_ao10_source_number XMM AO10 Source Identification Number meta.id;src short nullable fuv_mag_error GALEX FUV Magnitude Error mag stat.error;phot.mag;em.UV.100-200nm double nullable ukidss_rej_flag Flag [YN] Indicates UKIDSS Counterpart Failed Photometry Quality Control Checks meta.code char nullable wise_ra_error WISE Right Ascension Error arcsec stat.error;pos.eq.ra;em.IR double nullable galex_nuv_error_radius GALEX NUV Positional Error arcsec stat.error;pos;em.UV double nullable imag_error SDSS i Magnitude Error mag stat.error;phot.mag;em.opt.I double nullable flux_250_um_error Herschel 250um Flux Density Error mJy stat.error;phot.flux.density;em.mm.750-1500GHz double nullable sb_flux_lower Lower Bound on the Soft Flux erg/s/cm^2 phot.flux;em.X-ray.soft;stat.min double nullable w2_mag WISE W2 Magnitude mag phot.mag;em.IR.4-8um double nullable galex_cxo_rel MLE Reliability of GALEX Match to X-Ray Source stat.correlation;em.UV;em.X-ray double nullable rmag_error SDSS r Magnitude Error mag stat.error;phot.mag;em.opt.R double nullable hb_counts Net Counts Detected in Hard Band ct phot;em.X-ray.medium double nullable vhs_rej_flag Flag [YN] Indicates VHS Counterpart Failed Photometry Quality Control Checks meta.code char nullable sb_flux Soft (0.5-2keV) Flux erg/s/cm^2 phot.flux;em.X-ray.soft double nullable first_cxo_offset Distance Between X-Ray and FIRST Sources arcsec pos.angDistance;em.radio.750-1500MHz;em.X-ray double nullable first_ra FIRST Right Ascension degree pos.eq.ra;em.radio.750-1500MHz double nullable flux_350_um Herschel 350um Flux Density mJy phot.flux.density;em.mm.750-1500GHz double nullable sdss_cxo_offset Distance Between X-Ray and SDSS Sources arcsec pos.angDistance;em.opt;em.X-ray double nullable w2_mag_error WISE W2 Error mag stat.error;phot.mag;em.IR.4-8um double nullable vhs_cxo_offset Distance Between X-Ray and VHS Sources arcsec pos.angDistance;em.IR;em.X-ray double nullable xmm_ao13_prom_match Flag Indicates XMM AO13 Counterpart Is Promoted Match meta.id.cross char nullable log_fb_lx Full (0.5-10keV) X-Ray Luminosity log(erg/s) phys.luminosity;em.X-ray double nullable xmm_ao13_source_number XMM AO13 Source Identification Number meta.id;src short nullable ctrpt_coord_flag Flag Indicates Multiwavelength Coordinates Are Consistent meta.code short nullable kmag_error UKIDSS K Magnitude Error mag stat.error;phot.mag;em.IR.K double nullable wise_cxo_rel MLE Reliability of WISE Match to X-Ray Source stat.correlation;em.IR;em.X-ray double nullable class Browse Object Classification src.class short nullable sb_counts Net Counts Detected in Soft Band ct phot;em.X-ray.soft double nullable galex_fuv_error_radius GALEX FUV Positional Error arcsec stat.error;pos;em.UV double nullable hmag_error UKIDSS H Magnitude Error mag stat.error;phot.mag;em.IR.H double nullable wise_rej_flag Flag [YN] Indicates WISE Counterpart Failed Photometry Quality Control Checks meta.code char nullable vhs_hmag_error VHS H Magnitude Error mag stat.error;phot.mag;em.IR.H double nullable vhs_hmag VHS H Magnitude mag phot.mag;em.IR.H double nullable ymag UKIDSS Y Magnitude mag phot.mag;em.IR.J double nullable wise_dec WISE Declination degree pos.eq.dec;em.IR double nullable first_dec FIRST Declination degree pos.eq.dec;em.radio.750-1500MHz double nullable wise_cxo_offset Distance Between X-Ray and WISE Sources arcsec pos.angDistance;em.IR;em.X-ray double nullable first_name FIRST Counterpart Designation (FIRST JHHMMSS.s+DDMMSS) meta.id;em.radio.750-1500MHz char nullable rmag SDSS r Magnitude mag phot.mag;em.opt.R double nullable ukidss_ra UKIDSS Right Ascension degree pos.eq.ra;em.IR double nullable w4_mag WISE W4 Magnitude mag phot.mag;em.IR.15-30um double nullable ref_redshift Source of Spectroscopic Redshift meta.ref;src.redshift short nullable wise_ext_flag Flag [YN] Indicates Extended WISE Source meta.code;src char nullable vhs_cxo_rel MLE Reliability of VHS Match to X-Ray Source stat.correlation;em.IR;em.X-ray double nullable bii Galactic Latitude degree pos.galactic.lat double nullable xmm_ao10_prom_match Flag Indicates XMM AO10 Counterpart Is Promoted Match meta.id.cross char nullable sdss_dec SDSS Declination degree pos.eq.dec;em.opt double nullable herschel_ra Herschel Right Ascension degree pos.eq.ra;em.mm double nullable umag_error SDSS u Magnitude Error mag stat.error;phot.mag;em.opt.U double nullable herschel_dec Herschel Declination degree pos.eq.dec;em.mm double nullable vhs_jmag_error VHS J Magnitude Error mag stat.error;phot.mag;em.IR.J double nullable sdss_spect_object_id SDSS SpecObjID meta.id;src;em.opt char nullable spect_class Spectroscopic Class src.class char nullable sdss_rej_flag Flag [YN] Indicates SDSS Counterpart Failed Photometry Quality Control Checks meta.code char nullable redshift Spectroscopic Redshift src.redshift double nullable w3_mag_snr WISE W3 Signal-to-Noise Ratio stat.snr;phot.mag;em.IR.8-15um double nullable lii Galactic Longitude degree pos.galactic.lon double nullable hb_flux Hard (2-10keV) Flux erg/s/cm^2 phot.flux;em.X-ray.medium double nullable nuv_mag GALEX NUV Magnitude mag phot.mag;em.UV double nullable galex_dec GALEX Declination degree pos.eq.dec;em.UV double nullable wise_name WISE Source Designation (WISE JHHMMSS.ss+DDMMSS.s) meta.id;em.IR char nullable vhs_dec VHS Declination degree pos.eq.dec;em.IR double nullable w3_mag WISE W3 Magnitude mag phot.mag;em.IR.8-15um double nullable nuv_mag_error GALEX NUV Magnitude Error mag stat.error;phot.mag;em.UV double nullable flux_350_um_error Herschel 350um Flux Density Error mJy stat.error;phot.flux.density;em.mm.750-1500GHz double nullable ukidss_cxo_offset Distance Between X-Ray and UKIDSS Sources arcsec pos.angDistance;em.IR;em.X-ray double nullable hb_flux_upper Upper Bound on the Hard Flux erg/s/cm^2 phot.flux;em.X-ray.medium;stat.max double nullable sdss_coadd_flag Flag [YN] Indicates Counterpart Is from SDSS Coadded Catalog meta.code char nullable galex_ra GALEX Right Ascension degree pos.eq.ra;em.UV double nullable w1_mag_snr WISE W1 Signal-to-Noise Ratio stat.snr;phot.mag;em.IR.3-4um double nullable galex_id GALEX Object Identification Number (ObjID) meta.id;em.UV char nullable vhs_kmag_error VHS K Magnitude Error mag stat.error;phot.mag;em.IR.K double nullable xmm_ao10_flag Flag [YN] Indicates Source Is Found in Archival/AO10 XMM Catalog meta.code;em.X-ray char nullable kmag UKIDSS K Magnitude mag phot.mag;em.IR.K double nullable vhs_id VHS Identification meta.id;em.IR char nullable w3_mag_error WISE W3 Error mag stat.error;phot.mag;em.IR.8-15um double nullable w4_mag_snr WISE W4 Signal-to-Noise Ratio stat.snr;phot.mag;em.IR.15-30um double nullable zmag_error SDSS z Magnitude Error mag stat.error;phot.mag;em.opt double nullable ukidss_id UKIDSS Identification meta.id;em.IR char nullable w2_mag_snr WISE W2 Signal-to-Noise Ratio stat.snr;phot.mag;em.IR.4-8um double nullable wise_ra WISE Right Ascension degree pos.eq.ra;em.IR double nullable cxo_nn_offset Distance to Nearest Chandra Source arcsec pos.angDistance;em.X-ray double nullable ukidss_cxo_rel MLE Reliability of UKIDSS Match to X-Ray Source stat.correlation;em.IR;em.X-ray double nullable jmag_error UKIDSS J Magnitude Error mag stat.error;phot.mag;em.IR.J double nullable log_sb_lx Soft (0.5-2keV) X-Ray Luminosity log(erg/s) phys.luminosity;em.X-ray.soft double nullable fb_counts Net Counts Detected in the Full Band ct phot;em.X-ray double nullable zmag SDSS z Magnitude mag phot.mag;em.opt double nullable sdss_ra SDSS Right Ascension degree pos.eq.ra;em.opt double nullable flux_500_um Herschel 500um Flux Density mJy phot.flux.density;em.mm.400-750GHz double nullable log_hb_lx Hard (2-10keV) X-Ray Luminosity log(erg/s) phys.luminosity;em.X-ray.medium double nullable galex_cxo_offset Distance Between X-Ray and GALEX Sources arcsec pos.angDistance;em.UV;em.X-ray double nullable obsid Chandra Observation Identification Number meta.id;obs int nullable imag SDSS i Magnitude mag phot.mag;em.opt.I double nullable vhs_ra VHS Right Ascension degree pos.eq.ra;em.IR double nullable hmag UKIDSS H Magnitude mag phot.mag;em.IR.H double nullable umag SDSS u Magnitude mag phot.mag;em.opt.U double nullable hb_flux_lower Lower Bound on the Hard Flux erg/s/cm^2 phot.flux;em.X-ray.medium;stat.min double nullable wise_dec_error WISE Declination Error arcsec stat.error;pos.eq.dec;em.IR double nullable jmag UKIDSS J Magnitude mag phot.mag;em.IR.J double nullable vhs_jmag VHS J Magnitude mag phot.mag;em.IR.J double nullable lns_rem_flag Flag [YN] Indicates Source Is Removed from LogN-LogS Calculation meta.code char nullable flux_20_cm_error FIRST 1.4-GHz Flux Density Error mJy stat.error;phot.flux.density;em.radio.750-1500MHz double nullable fuv_mag GALEX FUV Magnitude mag phot.mag;em.UV.100-200nm double nullable sdss_cxo_rel MLE Reliability of SDSS Match to X-Ray Source stat.correlation;em.opt;em.X-ray double nullable xmm_ao13_flag Flag [YN] Indicates Source Is Found in AO13 XMM Catalog meta.code;em.X-ray char nullable herschel_cxo_offset Distance Between X-Ray and Herschel Sources arcsec pos.angDistance;em.mm;em.X-ray double nullable flux_500_um_error Herschel 500um Flux Density Error mJy stat.error;phot.flux.density;em.mm.400-750GHz double nullable sb_flux_upper Upper Bound on the Soft Flux erg/s/cm^2 phot.flux;em.X-ray.soft;stat.max double nullable w4_mag_error WISE W4 Error mag stat.error;phot.mag;em.IR.15-30um double nullable ymag_error UKIDSS Y Magnitude Error mag stat.error;phot.mag;em.IR.J double nullable ukidss_dec UKIDSS Declination degree pos.eq.dec;em.IR double nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable