J/ApJ/777/64ivo://CDS.VizieR/J/ApJ/777/64doi:10.26093/cds/vizier.17770064CDSComerford J.M.Schluns K.Greene J.E.Cool R.J.2017-12-15T10:55:06Z2015-05-05T08:04:46ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiredshiftedvisible-astronomyspectroscopysurveysDual supermassive black holes (SMBHs) with kiloparsec-scale separations in merger-remnant galaxies are informative tracers of galaxy evolution, but the avenue for identifying them in large numbers for such studies is not yet clear. One promising approach is to target spectroscopic signatures of systems where both SMBHs are fueled as dual active galactic nuclei (AGNs), or where one SMBH is fueled as an offset AGN. Dual AGNs may produce double-peaked narrow AGN emission lines, while offset AGNs may produce single-peaked narrow AGN emission lines with line-of-sight velocity offsets relative to the host galaxy. We search for such dual and offset systems among 173 Type 2 AGNs at z<0.37 in the AGN and Galaxy Evolution Survey (AGES), and we find two double-peaked AGNs and five offset AGN candidates. When we compare these results to a similar search of the DEEP2 Galaxy Redshift Survey and match the two samples in color, absolute magnitude, and minimum velocity offset, we find that the fraction of AGNs that are dual SMBH candidates increases from z=0.25 to z=0.7 by a factor of ~6 (from 2/70 to 16/91, or 2.9_-1.9_^+3.6^% to 18_-5_^+5^%). This may be associated with the rise in the galaxy merger fraction over the same cosmic time. As further evidence for a link with galaxy mergers, the AGES offset and dual AGN candidates are tentatively ~3 times more likely than the overall AGN population to reside in a host galaxy that has a companion galaxy (from 16/173 to 2/7, or 9_-2_^+3^% to 29_-19_^+26^%). Follow-up observations of the seven offset and dual AGN candidates in AGES will definitively distinguish velocity offsets produced by dual SMBHs from those produced by narrow-line region kinematics, and will help sharpen our observational approach to detecting dual SMBHs.2013ApJ...777...64Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/777/64CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/769/95 : [NeV] or [NeIII] double peaked SDSS quasars (Barrows+, 2013)J/ApJS/201/23 : Spectroscopy of 88 z<0.7 SDSS QSOs (Eracleous+, 2012)J/ApJ/753/42 : Double-peaked AGN. I. Dual AGN candidates (Comerford+, 2012)J/ApJS/200/8 : AGES: the AGN and Galaxy Evolution Survey (Kochanek+, 2012)J/ApJ/746/L22 : Dual AGNs in the nearby Universe (Koss+, 2012)J/ApJ/716/866 : SDSS search for binary AGN (Smith+, 2010)J/ApJ/708/427 : Type 2 AGNs with double-peaked [OIII] lines (Liu+, 2010)J/ApJ/705/L76 : AGNs with double-peaked [OIII] lines (Wang+, 2009)J/ApJ/614/91 : Black hole mass and accretion rate of AGNs (Wu+, 2004)J/AJ/126/1720 : ugriz and H{alpha} of double-peaked AGN (Strateva+, 2003)J/AJ/126/1183 : Major galaxy mergers at z<~3 (Conselice+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/777/64https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/777/64http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/777/64https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/777/64https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/777/64http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/777/64GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/777/64/table1 (Observed properties of the 173 AGN and Galaxy Evolution Survey (AGES) Type 2 AGNs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/777/64/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/777/64/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/777/64/table1?GETtext/xml+votable180.050000true216.18962533.24411110.0055555555555555565/2287 2628 6/9145 9146 9147 10501 10516 10517 10518 10521 10560https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/777/64?format=asciiOpticaldefaultJ/ApJ/777/64/table1Observed properties of the 173 AGN and Galaxy Evolution Survey (AGES) Type 2 AGNsSimbadNameSimbad column added by the CDSmeta.idcharNDWFSSource identifier (JHHMMSS.ss+DDMMSS.s) (1)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDSimbad column added by the CDSmeta.numberintnullablez[0.04/0.37] Host galaxy redshift (2)src.redshiftfloatHbVoff[-239/221] The H{beta} velocity offsetkm/sphys.veloc;arith.difffloate_HbVoff[11/286] Uncertainty in HbVoffkm/sstat.errorfloatO3Voff[-372/228] The [OIII] velocity offsetkm/sphys.veloc;arith.difffloate_O3Voff[3/387] Uncertainty in O3Voffkm/sstat.errorfloatHaVoff[-191/227] The H{alpha} velocity offsetkm/sphys.veloc;arith.difffloate_HaVoff[8/196] Uncertainty in HaVoffkm/sstat.errorfloatO3/Hb[1/14] The [OIII] 5007 to H{beta} ratiophot.flux;arith.ratiofloate_O3/Hb[0.01/7] Uncertainty in O3/Hbstat.error;phys.abundfloatN2/HaThe [NII] 6584 to H{alpha} ratiophot.flux;arith.ratiofloate_N2/HaUncertainty in N2/Hastat.error;phys.abundfloatS2/HaThe [SII] 6716,6731 to H{alpha} ratiophot.flux;arith.ratiofloate_S2/HaUncertainty in S2/Hastat.errorfloatO1/HaThe [OI] 6300 to H{alpha} ratiophot.flux;arith.ratiofloate_O1/HaUncertainty in O1/Hastat.error;phys.abundfloatClassClassification of double-peaked AGNs and offset AGN candidates from table 2; column added by CDSsrc.classcharn_Class[b] Also consistent with Seyfert class (3)meta.notecharAGESSources within 1" from AGES catalog (Kochanek+, 2012, J/ApJS/200/8)meta.ref.urlintnullable_RAPosition from NDWFS names (right ascension part)degpos.eq.ra;meta.main_DEPosition from NDWFS names (declination part)degpos.eq.dec;meta.main