CLASXSOID ivo://nasa.heasarc/clasxsoid NASA/GSFC HEASARC Trouille et al. 2026-10-02 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains the redshift catalog for the X-ray sources detected in the Chandra Large Area Synoptic X-ray Survey (CLASXS). The catalog for the CLASXS field includes redshifts from previous work. The authors have extended the redshift information for the full sample using photometric redshifts. The goal of the OPTX Project is to use this survey, together with the Chandra Deep Field-North (CDF-N) and the Chandra Lockman Area North Survey (CLANS), which are among the most spectroscopically complete surveys to date, to analyze the effect of spectral type on the shape and evolution of the X-ray luminosity functions and to compare the optical spectral types with the X-ray spectral properties. The CLANS and CLASXS surveys bridge the gap between the ultra-deep pencil-beam surveys, such as the Chandra Deep Fields, and the shallower, very large-area surveys. As a result, they probe the X-ray sources that contribute the bulk of the 2-8 keV X-ray background and cover the flux range of the observed break in the log N - log S distribution. This table also contains updated optical and infrared photometric catalogs for the X-ray sources in the CLASXS field. Note that for any source with both CFHT and Subaru data in the R and z' bands, the authors used the CFHT magnitude. Typical photometric uncertainties are given in Section 3.6 of the reference paper (Trouille et al. 2008). The X-ray information for the CLASXS catalog which was published in Yang et al. (2004, AJ, 128, 1501) is available as the HEASARC CLASXS table. This table was created by the HEASARC in January 2009 based on the electronic version of Table 12 from the paper which was obtained from the ApJ web site. This is a service provided by NASA HEASARC . 2008ApJS..179....1T https://heasarc.gsfc.nasa.gov/W3Browse/all/clasxsoid.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=clasxsoid& GET text/xml 180 99999 true 158.538 57.306 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=clasxsoid GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_clasxsoid&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 Infrared Optical public clasxsoid Chandra Large-Area Synoptic X-Ray Survey Optical & IR Catalog name Catalog Source Designation meta.id;meta.main char nullable ra Optical/Near-Infrared Right Ascension degree pos.eq.ra;meta.main double nullable dec Optical/Near-Infrared Declination degree pos.eq.dec;meta.main double nullable rmag The R Band AB Magnitude mag phot.mag;em.opt.R double nullable jmag The J Band AB Magnitude mag phot.mag;em.IR.J double nullable irac_3p6_um_mag Spitzer 3.6-um Band AB Magnitude mag phot.mag;em.IR.3-4um double nullable redshift Spectroscopic Redshift src.redshift double nullable phot_redshift Photometric Redshift src.redshift double nullable gmag The g-prime Band AB Magnitude mag phot.mag;em.opt double nullable kmag The K Band AB Magnitude mag phot.mag;em.IR.K double nullable zmag The z-prime Band AB Magnitude mag phot.mag;em.opt double nullable mips_24_um_mag Spitzer 24-um Band AB Magnitude mag phot.mag;em.IR.15-30um double nullable umag The U Band AB Magnitude mag phot.mag;em.opt.U double nullable imag The i-prime Band AB Magnitude mag phot.mag;em.opt.I double nullable ref_redshift Flag [s] Indicates Reference for Spectroscopic Redshift meta.ref;src.redshift char nullable bii Optical/Near-Infrared Galactic Latitude degree pos.galactic.lat double nullable vmag The V Band AB Magnitude mag phot.mag;em.opt.V double nullable lii Optical/Near-Infrared Galactic Longitude degree pos.galactic.lon double nullable source_number Sequential Identification Number for Each Source in Catalog meta.id;src short nullable hmag The H Band AB Magnitude mag phot.mag;em.IR.H double nullable broad_type Optical Spectral Classification meta.code;src.class short nullable bmag The B Band AB Magnitude mag phot.mag;em.opt.B 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