J/ApJ/775/116ivo://CDS.VizieR/J/ApJ/775/116doi:10.26093/cds/vizier.17750116CDSReines A.E.Greene J.E.Geha M.2017-06-13T11:09:24Z2015-04-17T11:51:59ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleispectroscopyvisible-astronomysloan-photometryWe present a sample of 151 dwarf galaxies (10^8.5^<~M_*_<~10^9.5^M_{sun}_) that exhibit optical spectroscopic signatures of accreting massive black holes (BHs), increasing the number of known active galaxies in this stellar-mass range by more than an order of magnitude. Utilizing data from the Sloan Digital Sky Survey Data Release 8 and stellar masses from the NASA-Sloan Atlas, we have systematically searched for active BHs in ~25000 emission-line galaxies with stellar masses comparable to the Magellanic Clouds and redshifts z<0.055. Using the narrow-line [OIII]/H{beta} versus [NII]/H{alpha} diagnostic diagram, we find photoionization signatures of BH accretion in 136 galaxies, a small fraction of which also exhibit broad H{alpha} emission. For these broad-line active galactic nucleus (AGN) candidates, we estimate BH masses using standard virial techniques and find a range of 10^5^<~M_BH_<~10^6^M_{sun}_ and a median of M_BH_~2x10^5^M_{sun}_. We also detect broad H{alpha} in 15 galaxies that have narrow-line ratios consistent with star-forming galaxies. Follow-up observations are required to determine if these are true type 1 AGN or if the broad H{alpha} is from stellar processes. The median absolute magnitude of the host galaxies in our active sample is M_g_=-18.1mag, which is ~1-2mag fainter than previous samples of AGN hosts with low-mass BHs. This work constrains the smallest galaxies that can form a massive BH, with implications for BH feedback in low-mass galaxies and the origin of the first supermassive BH seeds.2013ApJ...775..116Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/775/116CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)J/MNRAS/431/836 : Type 1 AGN at low z. III. (Stern+, 2013)J/ApJ/763/133 : Broad-line AGN with host galaxy colors (Trump+, 2013)J/ApJ/758/129 : 4Ms Chandra Deep Field South 6-8keV galaxies (Xue+, 2012)J/ApJ/755/167 : Low-mass black holes in SDSS Seyfert 1 galaxies (Dong+, 2012)J/AJ/144/4 : Local Group dwarf galaxy properties (McConnachie+, 2012)J/ApJS/201/23 : Spectroscopy of 88 z<0.7 SDSS QSOs (Eracleous+, 2012)J/ApJ/742/68 : HST observations of low-mass BH host galaxies (Jiang+, 2011)J/ApJ/733/60 : Accretion rate of AGNs from COSMOS surveys (Trump+, 2011)J/AJ/142/153 : Precision spectrophotometry at the level of 0.1% (Yan, 2011)J/ApJ/680/169 : SDSS DR5 virial black hole masses (Shen+, 2008)J/ApJ/670/92 : New sample of low-mass black holes in AGN (Greene+, 2007)J/ApJ/667/131 : Mass function of active black holes (Greene+, 2007)J/ApJS/166/470 : SDSS-Spitzer type I QSOs IR photometry (Richards+, 2006)J/ApJ/641/L21 : BH mass and velocity dispersion relation (Greene+, 2006)J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)J/A+A/401/1063 : Evolutionary synthesis models. III. (Anders+, 2003)http://www.nsatlas.org/ : The NASA-Sloan Atlas home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/775/116https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/775/116http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/775/116https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/775/116https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/775/116http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/775/116GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/775/116/bhgal (BPT diagram AGN and composites: galaxy properties and emission line fluxes)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/775/116/bhgal?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/775/116/bhgal?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/775/116/bhgal?GETtext/xml+votable180.050000true41.7349583-0.55133330.0055555555555555566/1676 4199 4314 4477 4478 4516 4531 4591 4685 4766 4814 4849 4983 5010 5035 5061 5081 5093 5149 5243 5254 5365 5396 5621 5659 5712 5785 5848 5919 5922 6005 6124 6402 6481 6488 6981 7238 7361 7401 7484 7507 8221 8254 8262 8274 8292 8307 8365 8368 8419 8469 8482 8506 8507 8526 8706 8714 8820 8896 8903 9054 9096 9277 9736 9741 9809 10027 10153 10200 10213 10259 10289 10394 10440 10490 10638 10661 10685 10702 10739 10748 10816 10842 10984 11073 11191 11396 17747 17753 18017 18096 18772 21970 22011 23208 25974 26004 26025 26331 26346 26451 26510 26981 27109 27245 27247 27335 27354 27384 27448 27612 27647 27714 27733 27736 27820 27851 28071 28192 28200 28243 28297 28369 28384 28457 28478 28495 28535 28548 28560 28566 28599 31459 31631 32494https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/775/116?format=asciiOpticaldefaultJ/ApJ/775/116/bhgalBPT diagram AGN and composites: galaxy properties and emission line fluxesSimbadNameSimbad column added by the CDSmeta.idcharn[0.5/6] Sersic index (2)stat.fit.paramfloatSeq[1/136] Running sequence number (G1)meta.id;meta.mainintprimaryr_Seq[abcd] Origin (1)meta.ref;pos.framecharNSAIDNASA-Sloan Atlas identification numbermeta.idintSDSSSDSS identification (JHHMMSS.ss+DDMMSS.s)meta.idcharPlatePlate of SDSS spectrummeta.noteintMJDMJD of SDSS spectrumdtime.epochintFiberFiber of SDSS spectrummeta.noteintz[0.001/0.06] Redshift (2)src.redshiftfloatlogM*[8/9.5] Log of the stellar mass (2)log(solMass)phys.massfloatgMag[-21.2/-15.1] Absolute g-band magnitude (2)magphys.magAbsfloatg-rThe (g-r) color index (2)magphot.color;em.opt.B;em.opt.Rfloatr50[0.4/6.7] Petrosian 50% light radius (2)kpcphysfloatSpInteractive spectrum from SDSSmeta.ref.urlcharNEDSimbad column added by the CDSmeta.ref.urlcharHb-nThe narrow H-{beta} emission line flux (3)zW.m**-2phot.flux;spect.linefloate_Hb-nError on Hb-n (3)zW.m**-2stat.errorfloatHb-b[70/894]? Broad H-{beta} emission line flux (3)zW.m**-2phot.flux;spect.linefloatnullablee_Hb-b[11/40]? Error on Hb-b (3)zW.m**-2stat.errorfloatnullableO5007The [OIII] 5007{AA} emission line flux (3)zW.m**-2phot.flux;em.line.OIII;spect.linefloate_O5007Error on O-5007 (3)zW.m**-2stat.errorfloatO6300[6/3543]? [OI] 6300 emission line flux (3)zW.m**-2phot.flux;spect.linefloatnullablee_O6300[1/49]? Error on O6300 (3)zW.m**-2stat.errorfloatnullableN6548The [NII] 6548 emission line flux (3)zW.m**-2phot.flux;spect.linefloate_N6548Error on N6548 (3)zW.m**-2stat.errorfloatHa-nThe narrow H-{alpha} emission line flux (3)zW.m**-2phot.flux;spect.linefloate_Ha-nError on Ha-n (3)zW.m**-2stat.errorfloatHa-b[56/6167]? Broad H-{alpha} emission line flux (3)zW.m**-2phot.flux;spect.linefloatnullablee_Ha-b[9/73]? Error on Ha-b (3)zW.m**-2stat.errorfloatnullableN6583The [NII] 6583 emission line flux (3)zW.m**-2phot.flux;spect.linefloate_N6583Error on N6583 (3)zW.m**-2stat.errorfloatS6716The [SII] 6716 emission line flux (3)zW.m**-2phot.flux;spect.linefloate_S6716Error on S6716 (3)zW.m**-2stat.errorfloatS6731The [SII] 6731 emission line flux (3)zW.m**-2phot.flux;spect.linefloate_S6731Error on S6731 (3)zW.m**-2stat.errorfloat_RAPositions from SDSS names (right ascension part)degpos.eq.ra;meta.main_DEPositions from SDSS names (declination part)degpos.eq.dec;meta.main