XMM/CFRSID ivo://nasa.heasarc/xmmcfrsoid NASA/GSFC HEASARC Waskett et al. 2026-07-17 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Optical Counterpart This table contains the proposed identifications for all the good optical ID candidates (true probability value P' that the object is not associated of < 0.15) corresponding to the X-ray sources from the XMM-Newton surveys of the 3 and 14 hours Right Ascension (hereafter 3-h and 14-h, respectively) fields from the Canada-France Redshift Survey. (These fields are also known as the Groth Strip). The X-ray sources cover the 0.5 - 10 keV flux range from ~2 x 10<sup>-15</sup> - 10<sup>-13</sup> erg/cm<sup>2</sup>/s. The authors have used a subset of the XMM-Newton sources, which have Chandra positions, to determine the best method of obtaining optical identifications of sources with only XMM-Newton positions. They found optical identifications for 79% of the XMM-Newton sources for which there were deep optical images. The sources without optical identifications are likely to be optically fainter and have higher redshifts than the sources with identifications. The authors have estimated 'photometric redshifts' for the identified sources, calibrating their method using ~200 galaxies in the fields with spectroscopic redshifts. They find that the redshift distribution has a strong peak at z ~ 0.7. This table was created by the HEASARC in July 2005 based on the combination of CDS table J/MNRAS/350/785/tablea34.dat (the merged Tables A3 and A4 from the published paper) and CDS table J/MNRAS/350/785/tablea56.dat (the merged Tables A5 and A6 from the published paper). This is a service provided by NASA HEASARC . 2004MNRAS.350..785W https://heasarc.gsfc.nasa.gov/W3Browse/all/xmmcfrsoid.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=xmmcfrsoid& GET text/xml 180 99999 true 45.56393 -0.05948 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=xmmcfrsoid GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_xmmcfrsoid&Action=More+Options&Action=Parameter+Search&ConeAdd=1 XMM-NEWTON 0.0166666666666667 Optical public xmmcfrsoid XMM-Newton/Canada-France Redshift Survey Fields Optical Identifi name Source Designation meta.id;meta.main char nullable cfdf_number Canada-France Deep Field Number int nullable ra Right Ascension of CFDF Object degree pos.eq.ra;meta.main double nullable dec Declination of CFDF Object degree pos.eq.dec;meta.main double nullable redshift Spectral Redshift src.redshift double nullable phot_redshift_3 Photometric Redshift from UBVRIZ Photometry double nullable vmag V (in AB system) Magnitude Measured in a 3-Arcsecond Diameter Aperture mag phot.mag;em.opt.V double nullable kmag_error RMS Uncertainty in K Magnitude mag double nullable notes Flags Indicate Additional Notes char nullable bii Galactic Latitude of CFDF Object degree pos.galactic.lat double nullable bmag B (in AB system) Magnitude Measured in a 3-Arcsecond Diameter Aperture mag phot.mag;em.opt.B double nullable xo_offset Offset between XMM Source and CFDF Object (arcsec) arcsec float nullable kmag K (in AB system) Magnitude Measured in a 3-Arcsecond Diameter Aperture mag double nullable imag I (in AB system) Magnitude Measured in a 3-Arcsecond Diameter Aperture mag phot.mag;em.opt.I double nullable phot_redshift_3_flag Flag Indicates Less Reliable Redshift from UBVRIZ Photometry char nullable itot_mag Total I Magnitude Measured Using a Variable Aperture mag double nullable umag_error RMS Uncertainty in U Magnitude mag stat.error;phot.mag;em.opt.U double nullable phot_redshift_2 Photometric Redshift from UBVIK Photometry double nullable lii Galactic Longitude of CFDF Object degree pos.galactic.lon double nullable bmag_error RMS Uncertainty in B Magnitude mag stat.error;phot.mag;em.opt.B double nullable umag U (in AB system) Magnitude Measured in a 3-Arcsecond Diameter Aperture mag phot.mag;em.opt.U double nullable true_probability True Confusion Probability Value double nullable phot_redshift_2_flag Flag Indicates Less Reliable Redshift from UBVIK Photometry char nullable phot_redshift_1_flag Flag Indicates Less Reliable Redshift from UBVI Photometry char nullable vmag_error RMS Uncertainty in V Magnitude mag stat.error;phot.mag;em.opt.V double nullable phot_redshift_1 Photometric Redshift from UBVI Photometry double nullable imag_error RMS Uncertainty in I Magnitude mag stat.error;phot.mag;em.opt.I 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