J/ApJ/881/L24ivo://CDS.VizieR/J/ApJ/881/L24doi:10.26093/cds/vizier.18819024CDSViswanath G.Stalin C.S.Rakshit S.Kurian K.S.Ujjwal K.,Gudennavar S.B.Kartha S.S.2021-04-27T11:40:16Z2021-02-19T12:55:24ZCDS support team

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

cds-question@unistra.frseyfert-galaxiesredshiftedvisible-astronomyspectroscopyblack-holesNarrow-line Seyfert 1 galaxies (NLS1s) are believed to be powered by the accretion of matter onto low-mass black holes (BHs) in spiral host galaxies with BH masses M_BH_~10^6^-10^8^M_{sun}_. However, the broadband spectral energy distribution of the {gamma}-ray-emitting NLS1s are found to be similar to flat-spectrum radio quasars. This challenges our current notion of NLS1s having low M_BH_. To resolve this tension of low M_BH_ values in NLS1s, we fitted the observed optical spectrum of a sample of radio-loud NLS1s (RL-NLS1s), radio-quiet NLS1s (RQ-NLS1s), and radio-quiet broad-line Seyfert 1 galaxies (RQ-BLS1s) of ~500 each with the standard Shakura-Sunyaev accretion disk (AD) model. For RL-NLS1s we found a mean log(M_BH_^AD^/M_{sun}_) of 7.98+/-0.54. For RQ-NLS1s and RQ-BLS1s we found mean log(M_BH_^AD^/M_{sun}_) of 8.00+/-0.43 and 7.90+/-0.57, respectively. While the derived M_BH_^AD^ values of RQ-BLS1s are similar to their virial masses, for NLS1s the derived M_BH_^AD^ values are about an order of magnitude larger than their virial estimates. Our analysis thus indicates that NLS1s have M_BH_ similar to RQ-BLS1s and their available virial M_BH_ values are underestimated, influenced by their observed relatively small emission line widths. Considering Eddington ratio as an estimation of the accretion rate and using M_BH_^AD^, we found the mean accretion rate of our RQ-NLS1s, RL-NLS1s, and RQ-BLS1s as 0.06_-0.05_^+0.16^, 0.05_-0.04_^+0.18^ and 0.05_-0.04_^+0.15^, respectively. Our results therefore suggest that NLS1s have BH masses and accretion rates that are similar to BLS1s.2019ApJ...881L..24Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/881/L24CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)VIII/92 : The FIRST Survey Catalog, Version 2014Dec17 (Helfand+ 2015)VII/283 : The Million Quasars (Milliquas) catalog (6.3) (Flesch, 2019)J/A+A/309/81 : X-ray properties of AGN (Wang+, 1996)J/AJ/124/3042 : Narrow-line Seyfert 1 galaxies from SDSS EDR (Williams+, 2002)J/ApJS/166/128 : Narrow line Seyfert 1 galaxies from SDSS-DR3 (Zhou+, 2006)J/ApJS/229/39 : Narrow line Seyfert 1 galaxies from SDSS-DR12 (Rakshit+, 2017)J/MNRAS/466/3309 : X-ray flux variability of AGN (Rani+, 2017)J/other/NewA/54.30 : NLS1s 2MASS and WISE photometry (Chen+, 2017)J/A+A/603/A100 : 37 GHz observations of NLS1 galaxies (Lahteenmaki+, 2017)J/A+A/615/A13 : Narrow line Seyfert 1 (NLS1) galaxies spectra (Schmidt+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/881/L24https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/881/L24http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/881/L24https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/881/L24https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/881/L24http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/881/L24GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/881/L24/table1 (Results of accretion disk (AD) model fitting to the SDSS spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/881/L24/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/881/L24/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/881/L24/table1?GETtext/xml+votable180.050000true0.5123333-10.51055560.0055555555555555565/1619 2097 7094 6/0 14 2098 2114 2138 2152 2222 2228 4106 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Should Not be used for identification.meta.recordintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainz[0.01/0.8] Spectroscopic redshiftsrc.redshiftfloatTypeObject type (1)src.classcharlogR[-46.2/5.4]? log radio loudness (2)phot.flux;arith.ratiofloatnullablelogLHb[39.8/44.5] log H{beta} luminosity; erg/slog(1e-07W)phys.luminosity;em.line.HbetafloatlogMVM[5.2/10.1] log black hole mass from virial methodphys.massfloatlogMAD[6/9.3] log black hole mass from AD model fitphys.massfloatE_logMAD[0/1.5] Upper uncertainty in logMADstat.error;stat.maxfloate_logMAD[0.1/1.4] Lower uncertainty in logMADstat.errorfloatlambda-Edd[0/9.9] Accretion rate {lambda}_Edd_ (3)phys.mass.lossfloatE_lambda-Edd[0/4.7] Upper uncertainty in lambda-Eddstat.error;stat.maxfloate_lambda-Edd[0/4.2] Lower uncertainty in lambda-Eddstat.errorfloatR17Display data from Rakshit+, 2017, J/ApJS/229/39meta.ref.urlintnullableSloanDisplay the online SDSS data for the nearest objectmeta.ref.urlchar