J/AJ/128/1483ivo://CDS.VizieR/J/AJ/128/1483doi:10.26093/cds/vizier.51281483CDSSteffen A.T.Barger A.J.Capak P.Cowie L.L.Mushotzky R.F.Yang Y.2005-06-07T20:58:01Z2005-06-07T20:57:38ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frx-ray-sourcesphotometryredshiftedWe present photometric and spectroscopic observations of the X-ray sources detected in the wide-area, moderately deep Chandra Large Area Synoptic X-ray Survey (CLASXS) of the Lockman Hole-Northwest field. We have B, V, R, I, and z' photometry for 521 (99%) of the 525 sources in the X-ray catalog and spectroscopic redshifts for 271 (52%), including 20 stars. We do not find evidence for redshift groupings of the X-ray sources, like those found in the Chandra Deep Field surveys, because of the larger solid angle covered by this survey. We separate the X-ray sources by optical spectral type and examine the colors, apparent and absolute magnitudes, and redshift distributions for the broad-line and nonbroad-line active galactic nuclei. Combining our wide-area survey with other Chandra and XMM-Newton hard X-ray surveys, we find a definite lack of luminous, high accretion rate sources at z<1, consistent with previous observations that showed that supermassive black hole growth is dominated at low redshifts by sources with low accretion rates.2004AJ....128.1483Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/128/1483CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/128/1501 : CLASXS: X-ray catalog (Yang+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/128/1483https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/128/1483http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/128/1483https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/128/1483https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/128/1483http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/128/1483GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/128/1483/table1 (Optical Properties of the CLASXS X-Ray Sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/128/1483/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/128/1483/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/128/1483/table1?GETtext/xml+votable180.050000true157.7317557.555560.0055555555555555566/6073 6075https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/128/1483?format=asciiX-rayOpticaldefaultJ/AJ/128/1483/table1Optical Properties of the CLASXS X-Ray SamplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintf_Vmag[-1/1]? Limit flag on Vmag (3)intnullableHB? The 2-8keV X-ray flux (1)aW.m**-2floatnullableCLASXSThe Yang et al. (2004, Cat. <J/AJ/128/1501>) numberintRAJ2000X-ray right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000X-ray declination in decimal degrees (J2000)degpos.eq.dec;meta.mainORAdeg? Optical right ascension in decimal degrees (J2000)degdoublenullableODEdeg? Optical declination in decimal degrees (J2000)degdoublenullableRSmallest aim-point distancearcminfloatSB? The 0.5-2keV X-ray flux (1)aW.m**-2floatnullableBmag? Aperture-corrected Johnson B-band AB magnitude (2)magfloatnullablef_Bmag[-1/1]? Limit flag on Bmag (3)intnullableVmag? Aperture-corrected Johnson V-band AB magnitude (2)magfloatnullableRcmag? Aperture-corrected Cousins R-band AB magnitude (2)magfloatnullablef_Rcmag[-1/1]? Limit flag on Rcmag (3)intnullableIcmag? Aperture-corrected Cousins I-band AB magnitude (2)magfloatnullablef_Icmag[-1/1]? Limit flag on Icmag (3)intnullablez'mag? Aperture-corrected Sloan z'-band AB magnitude (2)magfloatnullablef_z'mag[-1/1]? Limit flag on z'mag (3)intnullablezspec? Spectroscopic redshiftfloatnullablef_zspec? Flag on zspec (4)intnullable