J/A+A/618/A66ivo://CDS.VizieR/J/A+A/618/A66doi:10.26093/cds/vizier.36180066CDSSimmonds C.Buchner J.Salvato M.Hsu L.T.Bauer F.E.2018-11-05T10:52:51Z2018-10-15T07:49:54ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleix-ray-sourcesredshiftedspectroscopyphotometryRedshifts are fundamental for our understanding of extragalactic X-ray sources. Ambiguous counterpart associations, expensive optical spectroscopy and/or multimission multiwavelength coverage to resolve degeneracies make estimation often difficult in practice. We attempt to constrain redshifts of obscured Active Galactic Nuclei (AGN) using only low-resolution X-ray spectra. Our XZ method fits AGN X-ray spectra with a moderately complex spectral model incorporating a corona, torus obscurer and warm mirror. Using the Bayesian X-ray Astronomy (BXA) package, we constrain redshift, column density, photon index and luminosity simultaneously. The redshift information primarily comes from absorption edges in Compton-thin AGN, and from the Fe K{alpha} fluorescent line in heavily obscured AGN. A new generic background fitting method allows us to extract more information from limited numbers of source counts. We derive redshift constraints for 74/321 hard-band detected sources in the Chandra deep field South. Comparing with spectroscopic redshifts, we find an outlier fraction of 8%, indicating that our model assumptions are valid. For three Chandra deep fields, we release our XZ redshift estimates. The independent XZ estimate is easy to apply and effective for a large fraction of obscured AGN in todays deep surveys without the need for any additional data. Comparing to different redshift estimation methods, XZ can resolve degeneracies in photometric redshifts, help to detect potential association problems and confirm uncertain single-line spectroscopic redshifts. With high spectral resolution and large collecting area, this technique will be highly effective for Athena/WFI observations.2018A&A...618A..66Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/618/A66CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007)VII/265 : COSMOS Morphological Catalog (V1.1) (Tasca+ 2009)J/ApJ/796/60 : ECDFS galaxies photometric redshifts + counterparts (Hsu+ 2014)J/ApJ/802/89 : Luminosity function of X-ray-selected AGNs (Buchner+, 2015)J/ApJS/220/10 : AEGIS-X Deep survey of EGS (AEGIS-XD) (Nandra+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/618/A66https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/618/A66http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/618/A66https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/618/A66https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/618/A66http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/618/A66GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/618/A66/cosmos (Redshift information in COSMOS AGN)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/618/A66/cosmos?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/618/A66/cosmos?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/618/A66/cosmos?GETtext/xml+votable180.050000true149.70082.402560.005555555555555556Cone search capability for table J/A+A/618/A66/cdfs (Redshift information in CDF-S AGN)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/618/A66/cdfs?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/618/A66/cdfs?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/618/A66/cdfs?GETtext/xml+votable180.050000true53.16209889-27.950046110.005555555555555556Cone search capability for table J/A+A/618/A66/aegis (Redshift information in AEGIS-XD AGN)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/618/A66/aegis?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/618/A66/aegis?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/618/A66/aegis?GETtext/xml+votable180.050000true214.529652.42310.0055555555555555566/11424-11425 27247 27256 27258-27259 35935 35957https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/618/A66?format=asciiX-raydefaultJ/A+A/618/A66/cosmosRedshift information in COSMOS AGNrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXIDIdentification (cosmos_NNNN)meta.id;meta.maincharCountsAmount of detected source countsctphot.count;em.X-rayintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainXZ50% quantile of the posterior of XZmeta.notefloatb_XZ10% quantile of the posterior of XZmeta.notefloatB_XZ90% quantile of the posterior of XZmeta.notefloatphotoz50% quantile of the posterior of photozsrc.redshift.photfloatb_photoz10% quantile of the posterior of photozmeta.notefloatB_photoz90% quantile of the posterior of photozmeta.notefloatlogNH50% quantile of the posterior of NH (1)log(cm**-2)phys.columnDensityfloatb_logNH10% quantile of the posterior of NH (1)log(cm**-2)phys.columnDensity;stat.minfloatB_logNH90% quantile of the posterior of NH (1)log(cm**-2)phys.columnDensity;stat.maxfloatspecz? Spectroscopic redshiftsrc.redshift;pos.heliocentricfloatnullableIG[1/4.32] Information gainedmeta.codefloatJ/A+A/618/A66/cdfsRedshift information in CDF-S AGNCountsAmount of detected source countsctphot.count;em.X-rayintRAJ2000Rigth ascension (J2000)degpos.eq.ra;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXIDIdentification (cdfs4Ms_NNN)meta.id;meta.maincharDEJ2000Declination (J2000)degpos.eq.dec;meta.mainXZ50% quantile of the posterior of XZmeta.notefloatb_XZ10% quantile of the posterior of XZmeta.notefloatB_XZ90% quantile of the posterior of XZmeta.notefloatphotoz? 50% quantile of the posterior of photozsrc.redshift.photfloatnullableb_photoz? 10% quantile of the posterior of photozmeta.notefloatnullableB_photoz? 90% quantile of the posterior of photozmeta.notefloatnullablelogNH50% quantile of the posterior of NH (1)log(cm**-2)phys.columnDensityfloatb_logNH10% quantile of the posterior of NH (1)log(cm**-2)phys.columnDensity;stat.minfloatB_logNH90% quantile of the posterior of NH (1)log(cm**-2)phys.columnDensity;stat.maxfloatspecz? Spectroscopic redshiftsrc.redshift;pos.heliocentricfloatnullablequality[0/3]? Quality of specz, 0 is reliablemeta.code.qualintnullableIG[1/4.32] Information gainedmeta.codefloatSample[1/3] Subsample identificationmeta.idintJ/A+A/618/A66/aegisRedshift information in AEGIS-XD AGNrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXIDIdentification (aegis_NNN)meta.id;meta.maincharCountsAmount of detected source countsphot.count;em.X-rayintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainXZ50% quantile of the posterior of XZmeta.notefloatb_XZ10% quantile of the posterior of XZmeta.notefloatB_XZ90% quantile of the posterior of XZmeta.notefloatphotoz50% quantile of the posterior of photozsrc.redshift.photfloatb_photoz10% quantile of the posterior of photozmeta.notefloatB_photoz90% quantile of the posterior of photozmeta.notefloatlogNH50% quantile of the posterior of NH (1)log(cm**-2)phys.columnDensityfloatb_logNH10% quantile of the posterior of NH (1)log(cm**-2)phys.columnDensity;stat.minfloatB_logNH90% quantile of the posterior of NH (1)log(cm**-2)phys.columnDensity;stat.maxfloatspecz? Spectroscopic redshiftsrc.redshift;pos.heliocentricdoublenullableIG[1/4.32] Information gainedmeta.codefloat