J/ApJ/937/7ivo://CDS.VizieR/J/ApJ/937/7doi:10.26093/cds/vizier.19370007CDSSalehirad S.Reines A.E.Molina M.2024-11-06T20:27:41Z2024-08-30T08:54:38ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleigalaxiesspectroscopyvisible-astronomyredshiftedWe present an entirely new sample of 388 low-mass galaxies (M_*_<=10^10^M_{sun}_) that have spectroscopic signatures indicating the presence of massive black holes (BHs) in the form of active galactic nuclei (AGNs) or tidal disruption events. Of these, 70 have stellar masses in the dwarf galaxy regime with 10^8^<~M_*_/M_{sun}_<~10^9.5^. We identify the active galaxies by analyzing optical spectra of a parent sample of ~23000 low-mass emission-line galaxies in the Galaxy and Mass Assembly (GAMA) Survey Data Release 4, and employing four different diagnostics based on narrow emission-line ratios and the detection of high-ionization coronal lines. We find that 47 of the 388 low-mass active galaxies exhibit broad H{alpha} in their spectra, corresponding to virial BH masses in the range M_BH_~10^5.0-7.7^M_{sun}_ with a median BH mass of <M_BH_>~10^6.2^M_{sun}_. Our sample extends to higher redshifts (z<=0.3; <z>=0.13) than previous samples of AGNs in low-mass/dwarf galaxies based on Sloan Digital Sky Survey spectroscopy, which can be attributed to the spectroscopic limit of GAMA being ~2mag deeper. Moreover, our multi-diagnostic approach has revealed low-mass active galaxies spanning a wide range of properties, from blue star-forming dwarfs to luminous "miniquasars" powered by low-mass BHs. As such, this work has implications for BH seeding and AGN feedback at low masses.2022ApJ...937....7Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/937/7CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/329 : VIKING catalogue data release 1 (Edge+, 2013)II/343 : VIKING catalogue data release 2 (Edge+, 2016)J/A+AS/136/35 : WR galaxies and HII regions catalog (Schaerer+ 1999)J/ApJ/670/92 : New sample of low-mass black holes in AGN (Greene+, 2007)J/MNRAS/398/1165 : AGN in nearby galaxies (Goulding+, 2009)J/ApJ/755/167 : Low-mass black holes in SDSS Sy1 galaxies (Dong+, 2012)J/MNRAS/421/1043 : Emission-line galaxies from SDSS DR7 (Shirazi+, 2012)J/ApJ/775/116 : z<0.06 active black hole gal. from SDSS-DR8 (Reines+, 2013)J/MNRAS/452/2087 : Galaxy And Mass Assembly (GAMA): DR2 (Liske+, 2015)J/ApJ/813/82 : z<0.06 broad-line AGN emission-line measures (Reines+, 2015)J/MNRAS/454/3722 : AGN in nearby low-mass galaxies (Sartori+, 2015)J/MNRAS/474/3875 : Galaxy And Mass Assembly (GAMA): DR3 (Baldry+, 2018)J/ApJ/922/155 : [FeX]{lambda}6374 em. in SDSS dwarf galaxies (Molina+, 2021)http://www.gama-survey.org/ : Galaxy And Mass Assembly (GAMA) homepagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/937/7https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/937/7http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/937/7https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/937/7https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/937/7http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/937/7GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/937/7/table1 (AGNs in low-mass galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/937/7/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/937/7/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/937/7/table1?GETtext/xml+votable180.050000true30.26775-4.170220.0055555555555555560/https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/937/7?format=asciiOpticaldefaultJ/ApJ/937/7/table1AGNs in low-mass galaxiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCataId[7392/5374676] Unique ID of the GAMA object (1)meta.id;meta.mainintprimaryRAJ2000[30.26/351] Spectrum Right Ascension in decimal degrees (J2000) (1)degpos.eq.ra;meta.mainDEJ2000[-35/3] Spectrum Declination in decimal degrees (J2000) (1)degpos.eq.dec;meta.mainz[0.013/0.3] Spectroscopic redshift (1)src.redshiftdoublelogM[7.9/10] Log stellar mass (1)log(solMass)phys.massfloatgMag[-22.24/-12.45] Absolute g-band magnitude (1)magphys.magAbs;em.opt.Bfloatg-r[0.06/1.5] The (g-r) color index (1)magphot.color;em.opt.B;em.opt.RfloatNIILocGalaxy location in [NII]/HA diagram (2)src.class.starGalaxycharHeIILocGalaxy location in HeII/HB diagram (2) (3)src.class.starGalaxycharFeXDetA [FeX] detection? (3)meta.codecharNeVDetA [NeV] detection? (3)meta.codecharDR3Display data from GAMA-DR3 (Baldry+ 2018, J/MNRAS/474/3875)meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlcharJ/ApJ/937/7/table2Emission-line fluxesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCataId[7392/5374676] Unique ID of the GAMA objectmeta.id;meta.mainintprimaryNeV3426[0/247] The [NeV]3426 emission line flux (1)1e-17mW.m**-2phot.flux;spect.lineintHeII4686[0/193] HeII 4686 emission line flux (1)1e-17mW.m**-2phot.flux;spect.lineinte_HeII4686[0/31] Uncertainty in HeII4686 (1)1e-17mW.m**-2stat.error;phot.flux;spect.lineintHbeta-n[3/1427] Narrow Hbeta emission line flux (1)1e-17mW.m**-2phot.flux;spect.line;em.line.Hbetainte_Hbeta-n[1/27] Uncertainty in Hbeta-n (1)1e-17mW.m**-2stat.error;phot.flux;em.line.HbetaintHbeta-b[0/1239] Broad Hbeta emission line flux (1)1e-17mW.m**-2phot.flux;spect.line;em.line.Hbetainte_Hbeta-b[0/34] Uncertainty in Hbeta-b (1)1e-17mW.m**-2stat.error;phot.flux;em.line.HbetaintOIII5007[8/4528] The [OIII]5007 emission line flux (1)1e-17mW.m**-2phot.flux;spect.line;em.line.OIIIinte_OIII5007[1/218] Uncertainty in OIII5007 (1)1e-17mW.m**-2stat.error;phot.flux;em.line.OIIIintOI6300[0/165] The [OI]6300 emission line flux (1)1e-17mW.m**-2phot.flux;spect.lineinte_OI6300[0/18] Uncertainty in OI6300 (1)1e-17mW.m**-2stat.error;phot.flux;spect.lineintFeX6374[0/115] The [FeX]6374 emission line flux (1)1e-17mW.m**-2phot.flux;spect.lineinte_FeX6374[0/14] Uncertainty in FeX6374 (1)1e-17mW.m**-2stat.error;phot.flux;spect.lineintHalpha-n[15/5487] Narrow Halpha emission line flux (1)1e-17mW.m**-2phot.flux;spect.line;em.line.Halphainte_Halpha-n[1/60] Uncertainty in Halpha-n (1)1e-17mW.m**-2stat.error;phot.flux;em.line.HalphaintHalpha-b[0/4349] Broad Halpha emission line flux (1)1e-17mW.m**-2phot.flux;spect.line;em.line.Halphainte_Halpha-b[0/110] Uncertainty in Halpha-b (1)1e-17mW.m**-2stat.error;phot.flux;em.line.HalphaintNII6583[7/1673] The [NII]6583{AA} emission line flux (1)1e-17mW.m**-2phot.flux;spect.lineinte_NII6583[1/45] Uncertainty in NII6583 (1)1e-17mW.m**-2stat.error;phot.flux;spect.lineintSII6716[0/944] The [SII]6716 emission line flux (1)1e-17mW.m**-2phot.flux;spect.lineinte_SII6716[0/25] Uncertainty in SII6716 (1)1e-17mW.m**-2stat.error;phot.flux;spect.lineintSII6731[0/730] The [SII]6731 emission line flux (1)1e-17mW.m**-2phot.flux;spect.lineinte_NeV3426[0/9] Uncertainty in NeV3426 (1)1e-17mW.m**-2stat.error;phot.flux;spect.lineinte_SII6731[0/25] Uncertainty in SII6731 (1)1e-17mW.m**-2stat.error;phot.flux;spect.lineint