J/AJ/126/632ivo://CDS.VizieR/J/AJ/126/632doi:10.26093/cds/vizier.51260632CDSBarger A.J.Cowie L.L.Capak P.Alexander D.M.Bauer F.E.Fernandez E.,Brandt W.N.Garmire G.P.Hornschemeier A.E.2023-04-06T16:51:00Z2009-02-03T12:53:06ZCDS support team

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

cds-question@unistra.frx-ray-sourcesinfrared-photometryvisible-astronomybroad-band-photometrykron-cousins-photometryredshiftedWe present an optical and near-infrared catalog for the X-ray sources in the 2Ms Chandra observation of the Hubble Deep Field North region. We have high-quality multicolor imaging data for all 503 X-ray point sources in the X-ray-selected catalog and reliable spectroscopic redshifts for 284. We spectroscopically identify six high-redshift (z>1) type II quasars (L_2-8keV_>10^44^ergs/s) in our sample. Our spectroscopic completeness for the R<=24 sources is 87%. The spectroscopic redshift distribution shows two broad redshift spikes that have clearly grown over those originally seen in the 1Ms exposure. The spectroscopically identified extragalactic sources already comprise 75% of the measured 2-8keV light. Redshift slices versus 2-8keV flux show that an impressive 54% of the measured 2-8keV light arises from sources at z<1 and 68% from sources at z<2.2003AJ....126..632Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/126/632CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 2002)J/AJ/126/539 : Chandra Deep Field North 2Ms catalog (Alexander+, 2003)J/AJ/122/2810 : Chandra Deep Field North Survey. V. (Brandt+, 2001)J/ApJ/554/742 : Chandra Deep Survey of the HDF-N (Hornschemeier+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/126/632https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/126/632http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/126/632https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/126/632https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/126/632http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/126/632GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/126/632/table1a (Optical/NIR Properties of the 2Ms CDF-N X-Ray Sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/126/632/table1a?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/126/632/table1a?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/126/632/table1a?GETtext/xml+votable180.050000true188.812668162.235280.0055555555555555566/11230 11252https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/126/632?format=asciiX-rayOpticalInfrareddefaultJ/AJ/126/632/table1aOptical/NIR Properties of the 2Ms CDF-N X-Ray SamplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[ABB2003]Alexander et al. (<J/AJ/126/539>) number, [ABB2003] CDFN NNN in Simbadmeta.id;meta.mainintRAJ2000X-ray right ascension, decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000X-ray declination in decimal degrees (J2000)degpos.eq.dec;meta.mainoRAdegOptical right ascension (J2000)degpos.eq.radoubleoDEdegOptical declination (J2000)degpos.eq.decdoubleSB? The 0.5-2keV X-ray flux (1)1e-18W.m**-2phot.flux;em.X-rayfloatnullableHB? The 2-8keV X-ray flux (1)1e-18W.m**-2phot.flux;em.X-rayfloatnullableRmagI? Isophotal Cousins R magnitudemagphot.mag;em.opt.Rfloatnullablef_HK'magSign of HK' magnitude (5)meta.codecharHK'mag? Corrected-aperture Wainscoat-Cowie HK' magnitude (2.1um, 1992AJ....103..332W) (5)magphot.mag;em.IRfloatnullablef_z'magSign of z' magnitude (5)meta.codecharz'mag? Corrected-aperture Sloan z' magnitude (5)(2)magphot.mag;em.opt.Ifloatnullablef_IcmagSign of Ic magnitude (5)meta.codecharIcmag? Corrected-aperture Cousins I magnitude (5)magphot.mag;em.opt.Ifloatnullablef_RcmagSign of Rc magnitude (5)meta.codecharRcmag? Corrected-aperture Cousins R magnitude (5)magphot.mag;em.opt.Rfloatnullablef_VmagSign of V magnitude (5)meta.codecharVmag? Corrected-aperture Johnson V magnitude (5)magphot.mag;em.opt.Vfloatnullablef_BmagSign of B magnitude (5)meta.codecharBmag? Corrected-aperture Johnson B magnitude (5)magphot.mag;em.opt.Bfloatnullablef_UmagSign of U magnitude (5)meta.codecharUmag? Corrected-aperture U-band magnitude (5) (2)magphot.mag;em.opt.Ufloatnullablezspec? Spectroscopic redshiftsrc.redshiftfloatnullablef_zspec[os] Flag on zspec (3)meta.codecharzphot? Photometric redshiftsrc.redshiftfloatnullableTypeSpectrum type (4)meta.notechar