J/ApJ/823/95ivo://CDS.VizieR/J/ApJ/823/95doi:10.26093/cds/vizier.18230095CDSCappelluti N.Comastri A.Fontana A.Zamorani G.Amorin R.,Castellano M.Merlin E.Santini P.Elbaz D.Schreiber C.Shu X.,Wang T.Dunlop J.S.Bourne N.Bruce V.A.Buitrago F.Michalowski M.J.,Derriere S.Ferguson H.C.Faber S.M.Vito F.2017-06-01T08:52:04Z2016-05-31T08:25:31ZCDS support team

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

cds-question@unistra.frsurveysx-ray-sourcesastronomical-object-identificationgalaxiesvisible-astronomyactive-galactic-nucleiImproving the capabilities of detecting faint X-ray sources is fundamental to increase the statistics on faint high-z AGN and star-forming galaxies. We performed a simultaneous Maximum Likelihood PSF fit in the [0.5-2]keV and [2-7]keV energy bands of the 4Ms Chandra Deep Field South (CDFS) data at the position of the 34930 CANDELS H-band selected galaxies. For each detected source we provide X-ray photometry and optical counterpart validation. We validated this technique by means of a raytracing simulation. We detected a total of 698 X-ray point-sources with a likelihood L>4.98 (i.e.> 2.7{sigma}). We show that the prior knowledge of a deep sample of Optical-NIR galaxies leads to a significant increase of the detection of faint (i.e. ~10^-17^cgs in the [0.5-2]keV band) sources with respect to "blind" X-ray detections. By including previous catalogs, this work increases the total number of X-ray sources detected in the 4Ms CDFS, CANDELS area to 793, which represents the largest sample of extremely faint X-ray sources assembled to date. Our results suggest that a large fraction of the optical counterparts of our X-ray sources determined by likelihood ratio actually coincides with the priors used for the source detection. Most of th e new detected sources are likely star-forming galaxies or faint absorbed AGN. We identified a few sources sources with putative photometric redshift z>4. Despite the low number statistics, this sample significantly increases the number of X-ray selected candidate high-z AGN.2016ApJ...823...95Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/823/95CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/179/19 : CDFS survey: 2 Ms source catalogs (Luo+, 2008)J/ApJS/195/10 : The CDF-S survey: 4Ms source catalogs (Xue+, 2011)J/ApJ/801/97 : GOODS-S+UDS stellar mass catalogs from CANDELS (Santini+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/823/95https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/823/95http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/823/95https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/823/95https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/823/95http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/823/95GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/823/95/catalog (List of detected Chandra counterparts)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/823/95/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/823/95/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/823/95/catalog?GETtext/xml+votable180.050000true53.04097-27.837556940.0055555555555555566/35935https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/823/95?format=asciiX-rayOpticaldefaultJ/ApJ/823/95/catalogList of detected Chandra counterpartsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNID? ID of the X-ray source (NID)meta.id;meta.mainintnullablePID? CANDELS ID of the optical source used as prior for the X-ray source detection (PRIOR_ID)meta.idintnullablef_PID? Flag to determine the reliability of the association with a prior (FLAG_PRIOR)meta.codeintnullableBID? CANDELS ID of the primary optical counterpart of the X-ray source from LR (BEST_ID)meta.idintnullableSID? CANDELS ID of the second best optical counterpart of the X-ray source from LR (SECOND)meta.idintnullableQual? Quality of the identification flag (FLAG)meta.code.qualintnullableRAJ2000Best fit right ascension of the X-ray centroid (J2000) (RA_X)degpos.eq.ra;meta.mainDEJ2000Best fit declination of the X-ray centroid (J2000) (DEC_X)degpos.eq.dec;meta.maine_PosError on the X-ray centroid position (RADEC_ERR)arcsecstat.errordoubleSepDistance from the best optical counterpart (SEP)pos.angDistancedoublectFCounts in [0.5-7] keV band (SCTS_FULL)ctphot.count;em.X-raydoublee_ctF1 sigma [0.5-7] keV counts error (SCTS_ERR_FULL)ctstat.errordoublectSCounts in [0.5-2] keV band (SCTS_SOFT)ctphot.count;em.X-raydoublee_ctS1 sigma [0.5-2] keV counts error (SCTS_ERR_SOFT)ctstat.errordoublectHCounts in [2-7] keV band (SCTS_HARD)ctphot.count;em.X-raydoublee_ctH1 sigma [2-7] keV counts error (SCTS_ERR_HARD)ctstat.errordoubleLF-ln(p) determined in the [0.5-7] keV band (L_FULL)phys.luminosity;em.X-raydoubleLS-ln(p) determined in the [0.5-2] keV band (L_SOFT)phys.luminosity;em.X-raydoubleLH-ln(p) determined in the [2-7] keV band (L_HARD)phys.luminosity;em.X-raydoubleExpmapF?=- Exposure time in full band (Not used) (EXP_MAP_FULL)stime.duration;obs.exposuredoublenullableExpmapSExposure time in soft band (EXP_MAP_SOFT)stime.duration;obs.exposure;em.X-ray.softdoubleExpmapHExposure time in hard band (EXP_MAP_HARD)stime.duration;obs.exposure;em.X-ray.harddoubleFluxFFlux in [0.5-10] keV band (FLUX_FULL)1e-19W.m**-2phot.flux;em.X-raydoublee_FluxF1sigma [0.5-10] keV flux error (FLUX_ERR_FULL)1e-19W.m**-2stat.errordoubleFluxSFlux in [0.5-2] keV band (FLUX_SOFT)1e-19W.m**-2phot.flux;em.X-raydoublee_FluxS1sigma [0.5-20] keV flux error (FLUX_ERR_SOFT)1e-19W.m**-2stat.errordoubleFluxHFlux in [2-10] keV band (FLUX_HARD)1e-19W.m**-2phot.flux;em.X-raydoublee_FluxH1 sigma [2-10] keV flux error (FLUX_ERR_HARD)1e-19W.m**-2stat.errordoubleCRFCount-rate in [0.5-7] keV band (RATE_FULL)ct/sphot.count;em.X-raydoublee_CRF1 sigma [0.5-7] keV count rate error (RATE_ERR_FULL)ct/sstat.errordoubleCRSCount-rate in [0.5-2] keV band (RATE_SOFT)ct/sphot.count;em.X-raydoublee_CRS1 sigma [0.5-2] keV count rate error (RATE_ERR_SOFT)ct/sstat.errordoubleCRHCount-rate in [2-7] keV band (RATE_HARD)ct/sphot.count;em.X-raydoublee_CRH1 sigma [2-7] keV count rate error (RATE_ERR_HARD)ct/sstat.errordoubleHR1Hardness ratio (HR1)phot.flux;arith.ratiodoublee_HR1Hardness ratio error (HR1_ERR)stat.errordoubleOffaxisOff Axis Angle (offax)arcmininstr.offsetdoubleRAodegBest fit right ascension of the best CANDELS counterpart (J2000) (RA_OPT)pos.eq.raDEodegBest fit declination of the best CANDELS counterpart (J2000) (DEC_OPT)pos.eq.decF160WmagF160W AB magnitude (mag(f160w))phot.mag;em.UV.100-200nmfloatzspSpectroscopic redshift from Santini et al., 2015, Cat. J/ApJ/801/97 (Spec_z)src.redshiftdoublezphPhotometric redshift from Santini et al., 2015, Cat. J/ApJ/801/97 (Photo_z)src.redshiftfloatzph2Photometric redshift from Hsu et al., 2014ApJ...796...60H (Photo_z_h)src.redshift.photdoubleXue11?=-99 Source ID in Xuz et al., 2011, Cat. J/ApJS/195/10 (XID_Xue11)meta.idintnullable