J/ApJ/765/87ivo://CDS.VizieR/J/ApJ/765/87doi:10.26093/cds/vizier.17650087CDSLehmer B.D.Lucy A.B.Alexander D.M.Best P.N.Geach J.E.,Harrison C.M.Hornschemeier A.E.Matsuda Y.Mullaney J.R.Smail I.,Sobral D.Swinbank A.M.2018-01-30T07:17:50Z2014-11-26T08:36:20ZCDS support team

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

cds-question@unistra.frx-ray-sourcesgalaxiesvisible-astronomyquasarsWe present results from a {approx}100ks Chandra observation of the 2QZ Cluster 1004+00 structure at z=2.23 (hereafter 2QZ Clus). 2QZ Clus was originally identified as an overdensity of four optically-selected QSOs at z=2.23 within a 15x15arcmin^2^ region. Narrow-band imaging in the near-IR (within the K band) revealed that the structure contains an additional overdensity of 22 z=2.23 H{alpha}-emitting galaxies (HAEs), resulting in 23 unique z=2.23 HAEs/QSOs (22 within the Chandra field of view). Our Chandra observations reveal that three HAEs in addition to the four QSOs harbor powerfully accreting supermassive black holes (SMBHs), with 2-10keV luminosities of ~(8-60)x10^43^erg/s and X-ray spectral slopes consistent with unobscured active galactic nucleus (AGN). Using a large comparison sample of 210 z=2.23 HAEs in the Chandra-COSMOS field (C-COSMOS), we find suggestive evidence that the AGN fraction increases with local HAE galaxy density. The 2QZ Clus HAEs reside in a moderately overdense environment (a factor of {approx}2 times over the field), and after excluding optically-selected QSOs, we find that the AGN fraction is a factor of {approx}3.5^+3.8^_-2.2_ times higher than C-COSMOS HAEs in similar environments. Using stacking analyses of the Chandra data and Herschel SPIRE observations at 250{mu}m, we respectively estimate mean SMBH accretion rates ((dM/dt)_BH_) and star formation rates (SFRs) for the 2QZ Clus and C-COSMOS samples.2013ApJ...765...87Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/765/87CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2014)VIII/95 : Herschel Multi-tiered Extragalactic Survey (Oliver+, 2012)VII/265 : COSMOS Morphological Catalog (V1.1) (Tasca+ 2009)VII/241 : The 2dF QSO Redshift Survey (Croom+ 2004)J/MNRAS/428/1128 : UDS/COSMOS HiZELS galaxies (Sobral+, 2013)J/ApJS/201/30 : The Chandra COSMOS survey. III. (Civano+, 2012)J/MNRAS/416/2041 : H{alpha} emitters at z=2.23 (Matsuda+, 2011)J/ApJ/720/368 : Color-magnitude relations of galaxies in CDFs (Xue+, 2010)J/MNRAS/400/299 : Chandra deep protocluster survey (Lehmer+, 2009)J/ApJS/184/158 : Chandra COSMOS survey I. (Elvis+, 2009)J/ApJ/681/1163 : Late-type galaxies in Chandra deep fields (Lehmer+, 2008)J/ApJ/666/806 : SED of Spitzer quasars (QUEST) (Netzer+, 2007)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/ApJ/765/87https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/765/87http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/765/87https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/765/87https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/765/87http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/765/87GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/765/87/table1 (Chandra point-source catalog of the 2QZ Cluster field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/765/87/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/765/87/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/765/87/table1?GETtext/xml+votable180.050000true150.7529170.1816940.0055555555555555566/27237 27239https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/765/87?format=asciiX-rayOpticaldefaultJ/ApJ/765/87/table1Chandra point-source catalog of the 2QZ Cluster fieldSeq[1/133] Source identification numbermeta.id;meta.mainintprimaryn_SeqNote(s) on source (2)meta.notecharRAJ2000[10] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[00] Degree of Declination (J2000)pos.eq.dec;meta.mainFcts[2.2/464] Net full 0.5-7keV band countsctphot.count;em.X-rayfloatE_Fcts[-1/24] Upper 1{sigma} bound on Fcts (1)ctstat.error;stat.maxfloate_Fcts[-1/23] Lower 1{sigma} bound on Fcts (1)ctstat.errorfloatScts[1.9/307] Net soft 0.5-2keV band countsctphot.count;em.X-rayfloatE_Scts[-1/20] Upper 1{sigma} bound on Scts (1)ctstat.error;stat.maxfloate_Scts[-1/19] Lower 1{sigma} bound on Scts (1)ctstat.errorfloatHcts[6.2/157] Net hard 2-7keV band countsctphot.count;em.X-rayfloatE_Hcts[-1/15] Upper 1{sigma} bound on Hcts (1)ctstat.error;stat.maxfloate_Hcts[-1/14] Lower 1{sigma} bound on Hcts (1)ctstat.errorfloatFexpFull 0.5-7keV vignetting corrected exposurekstime.duration;obs.exposure;em.X-ray.mediumfloatSexpSoft 0.5-2keV vignetting corrected exposurekstime.duration;obs.exposure;em.X-ray.softfloatHexpHard 2-7keV vignetting corrected exposurekstime.duration;obs.exposure;em.X-ray.mediumfloatFCR[0.3/51] Full 0.5-7keV band count rate0.0001count.s**-1phot.count;em.X-rayfloatE_FCR[-1/7] Upper 1{sigma} bound on FCR (1)0.0001count.s**-1stat.error;stat.maxfloate_FCR[-1/5] Lower 1{sigma} bound on FCR (1)0.0001count.s**-1stat.errorfloatSCR[0.2/34] Soft 0.5-2keV band count rate0.0001count.s**-1phot.count;em.X-rayfloatE_SCR[-1/6] Upper 1{sigma} bound on SCR (1)0.0001count.s**-1stat.error;stat.maxfloate_SCR[-1/4] Lower 1{sigma} bound on SCR (1)0.0001count.s**-1stat.errorfloatHCR[0.6/17] Hard 2-7keV band count rate0.0001count.s**-1phot.count;em.X-rayfloatE_HCR[-1/2] Upper 1{sigma} bound on HCR (1)0.0001count.s**-1stat.error;stat.maxfloate_HCR[-1/5] Lower 1{sigma} bound on HCR (1)0.0001count.s**-1stat.errorfloatFfluxFull 0.5-7keV band flux; erg/s/cm^2^mW.m**-2phot.flux;em.X-raydoubleSfluxSoft 0.5-2keV band flux; erg/s/cm^2^mW.m**-2phot.flux;em.X-raydoubleHfluxHard 2-7keV band flux; erg/s/cm^2^mW.m**-2phot.flux;em.X-raydouble