J/ApJ/930/110ivo://CDS.VizieR/J/ApJ/930/110doi:10.26093/cds/vizier.19300110CDSYuk H.Dai X.Jayasinghe T.Fu H.Mishra H.D.Kochanek C.S.,Shappee B.J.Stanek K.Z.2024-11-06T20:25:12Z2024-04-29T11:16:25ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleivisible-astronomybroad-band-photometryspectroscopysurveysLow luminosity active galactic nuclei (LLAGN) probe accretion physics in the low Eddington regime can provide additional clues about galaxy evolution. AGN variability is ubiquitous and thus provides a reliable tool for finding AGN. We analyze the All-Sky Automated Survey for SuperNovae light curves of 1218 galaxies with g<14mag and Sloan Digital Sky Survey spectra in search of AGN. We find 37 objects that are both variable and have AGN-like structure functions, which is about 3% of the sample. The majority of the variability selected AGN are LLAGN with Eddington ratios ranging from 10^-4^ to 10^-2^. We thus estimate the fraction of LLAGN in the population of galaxies as 2% down to a median Eddington ratio of 2x10^-3^. Combining the BPT line ratio AGN diagnostics and the broad-line AGN, up to ~60% of the AGN candidates are confirmed spectroscopically. The BPT diagnostics also classified 10%-30% of the candidates as star-forming galaxies rather than AGN.2022ApJ...930..110Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/930/110CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/366 : ASAS-SN catalog of variable stars (Jayasinghe+, 2018-2020)V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)J/ApJS/112/315 : Spectroscopic parameters of Seyfert nuclei (Ho+ 1997)J/ApJ/698/895 : Variations in QSOs optical flux (Kelly+, 2009)J/ApJ/690/20 : Models of the AGN and black hole populations (Shankar+, 2009)J/ApJ/713/970 : Low-resolution SED templates for AGNs & gal. (Assef+, 2010)J/ApJ/728/26 : QSO selection based on phot. variability (Macleod+, 2011)J/ApJ/746/L22 : Dual AGNs in the nearby Universe (Koss+, 2012)J/ApJ/753/106 : Quasar variability with SDSS and POSS imaging (MacLeod+, 2012)J/ApJ/825/72 : Study of gal. & AGNs in z>1 clusters (Alberts+, 2016)J/ApJ/817/119 : Spitzer variability survey of Bootes field (Kozlowski+, 2016)J/ApJ/856/93 : SDSS-IV MaNGA: kinematic galaxy pairs (Fu+, 2018)J/ApJ/896/10 : NSA low-mass gal. with long-term PTF obs. (Baldassare+, 2020)http://asas-sn.osu.edu/photometry : ASAS-SN online photometry databasehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/930/110https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/930/110http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/930/110https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/930/110https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/930/110http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/930/110GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/930/110/table2 (Data of AGN candidates from ASAS-SN light curves)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/930/110/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/930/110/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/930/110/table2?GETtext/xml+votable180.050000true33.6398353-0.76671720.0055555555555555566/5998 6082 6101-6102 6623 7461 8922 8938 10240 10375 10382 10454 10705 11246 17727 17767 26563 27088 27391 27674 27720-27721 27723 28075-28076 28249 28436 28468 28515 28517 28612 36773https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/930/110?format=asciiOpticaldefaultJ/ApJ/930/110/table2Data of AGN candidates from ASAS-SN light curvesSimbadNameSimbad column added by the CDSmeta.idcharnullableNEDNED column added by the CDSmeta.ref.urlcharLEDAmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the objectmeta.id;meta.maincharprimaryAGNKnown AGN?meta.codecharz[0.0018/0.09] Redshift from SDSSsrc.redshiftfloatMorphMorphology from NEDsrc.morphcharlogL[7.82/11.48] Log of the V-band (unless flagged) luminositylog(solLum)phys.luminosity;em.optfloatf_logLa: g-band luminositymeta.codecharlogMBH[5.7/9.5] Central supermassive black hole mass (see Section 5.3)log(solMass)phys.massfloatREdd[0.0002/0.02] Eddington ratio (see Section 5.3)phot.flux;arith.ratiodoubleNpNumber of photometric measurements for this source (link to Table 1)meta.numberintnullableLCInteractive LC Plotmeta.ref.urlcharSloanDisplay the online SDSS-DR17 data for the nearest objectmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/ApJ/930/110/table1ASAS-SN photometry of AGN candidatesNameName of the objectmeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFiltFilter ("V" or "g")meta.id;instr.filtercharHJDHeliocentric Julian datedtime.epochdoubleindexedmag[12.26/16.7] Magnitude in Filtermagphot.magfloate_mag[0/0.6] Uncertainty in magmagstat.error;phot.magdouble