J/ApJ/705/L76ivo://CDS.VizieR/J/ApJ/705/L76doi:10.26093/cds/vizier.17059076CDSWang J.-M.Chen Y.-M.Hu C.Mao W.-M.Zhang S.Bian W.-H.2017-09-29T09:03:38Z2012-01-04T08:54:28ZCDS support team

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

cds-question@unistra.frredshiftedgalaxiesspectroscopyactive-galactic-nucleiDouble-peaked [OIII] profiles in active galactic nuclei (AGNs) may provide evidence for the existence of dual AGNs, but a good diagnostic for selecting them is currently lacking. Starting from ~7000 active galaxies in Sloan Digital Sky Survey DR7, we assemble a sample of 87 type 2 AGNs with double-peaked [OIII] profiles. The nuclear obscuration in the type 2 AGNs allows us to determine redshifts of host galaxies through stellar absorption lines. We typically find that one peak is redshifted and another is blueshifted relative to the host galaxy. We find a strong correlation between the ratios of the shifts and the double peak fluxes. The correlation can be naturally explained by the Keplerian relation predicted by models of co-rotating dual AGNs. The current sample statistically favors that most of the [OIII] double-peaked sources are dual AGNs and disfavors other explanations, such as rotating disk and outflows. These dual AGNs have a separation distance at ~1kpc scale, showing an intermediate phase of merging systems. The appearance of dual AGNs is about ~10^-2^, impacting on the current observational deficit of binary supermassive black holes with a probability of ~10^-4^ (Boroson & Lauer, 2009Natur.458...53B).2009ApJ...705L..76Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/705/L76CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)J/A+A/534/A110 : Type-2 AGN from XMM-COSMOS bolometric output (Lusso+, 2011)J/A+A/510/A56 : zCOSMOS type-2 AGN (Bongiorno, 2010)J/MNRAS/399/1206 : SWIRE/SDSS quasars. II. Type 2 AGN (Hatziminaoglou+, 2009)J/AJ/130/381 : Blueshifted [O III] emission (Boroson+, 2005)J/ApJS/143/257 : AGN emission line properties (Kuraszkiewicz+, 2002)J/ApJ/549/155 : [OIII] emission in a sample of AGNs (Nagao+, 2001)http://www.mpa-garching.mpg.de/SDSS/DR7/ : MPA-JHU DR7 spectrum measurementshttp://www.sdss.org/ : SDSS home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/705/L76https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/705/L76http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/705/L76https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/705/L76https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/705/L76http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/705/L76GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/705/L76/table1 (The sample of type 2 AGNs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/705/L76/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/705/L76/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/705/L76/table1?GETtext/xml+votable180.050000true0.70441670.75133330.0055555555555555566/4290 4400 4851 5203 5239 5302 5322 5498 5551 5685 5694 6116 6220 6236 6356 6458 6568 6582 6623 6640 7224 7422 8215 8514 8561 8725 9017 9083 9156 9203 9231 9265 9328 9352 9407 9882 9911 9950 10293 10616 10719 11059 11109 11261 11322 11388 17818 17827 18395 18518 18519 18829 19457 19678 26278 26342 26349 26359 26386 26432 26949 26955 26960 27074 27080 27083 27121 27224 27227 27233 27686 27803 27839 27842 27853 28021 28217 28224 28244 28311 28409 28434 28471 28579 31449 31660https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/705/L76?format=asciiOpticaldefaultJ/ApJ/705/L76/table1The sample of type 2 AGNsSDSSSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameAGN SDSS identification (JHHMMSS+DDMMSS)meta.id;meta.maincharzSpectroscopic redshiftsrc.redshiftdoublee_zUncertainty in zstat.error;src.redshiftfloatDel1The [OIII] doppler blue shift in Angstroms0.1nmstat.fit.paramfloate_Del1Uncertainty in Del1 in Angstroms0.1nmstat.errorfloatDel2The [OIII] doppler red shift in Angstroms0.1nmstat.fit.paramfloate_Del2Uncertainty in Del2 in Angstroms0.1nmstat.errorfloatFOIII1The red [OIII] flux in 10^-17^erg/s/cm^2^1e-20W.m**-2phot.fluxinte_FOIII1Uncertainty in FOIII1 in 10^-17^erg/s/cm^2^1e-20W.m**-2stat.errorintFOIII2The blue [OIII] flux in 10^-17^erg/s/cm^2^1e-20W.m**-2phot.fluxinte_FOIII2Uncertainty in FOIII2 in 10^-17^erg/s/cm^2^1e-20W.m**-2stat.errorintD? Separation of two components in the BPT diagram (Baldwin, Phillips & Terlevich, 1981PASP...93....5B)stat.fit.paramfloatnullableDR7Display the SDSS-DR7 photometric catalog (II/294)meta.ref.urlcharSloanDisplay the SDSS data for this type-2 AGNmeta.ref.urlcharNEDSimbad column added by the CDSmeta.refchar_RAPositions from SDSS-DR7 names (right ascension part)degpos.eq.ra;meta.main_DEPositions from SDSS-DR7 names (declination part)degpos.eq.dec;meta.main