J/ApJS/258/38ivo://CDS.VizieR/J/ApJS/258/38doi:10.26093/cds/vizier.22580038CDSPark D.Barth A.J.Ho L.C.Laor A.2022-09-07T13:28:54Z2022-06-13T08:22:52ZCDS support team

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

cds-question@unistra.frseyfert-galaxiesvisible-astronomyspectroscopyultraviolet-astronomyquasarsredshiftedWe present a new empirical template for iron emission in active galactic nuclei (AGNs) covering the 4000-5600{AA} range. The new template is based on a spectrum of the narrow-line Seyfert 1 galaxy Mrk 493 obtained with the Hubble Space Telescope. In comparison with the canonical iron template object I Zw 1, Mrk 493 has narrower broad-line widths, lower reddening, and a less extreme Eddington ratio, making it a superior choice for template construction. We carried out a multicomponent spectral decomposition to produce a template incorporating all the permitted and forbidden lines of FeII identified in the Mrk 493 spectrum over this wavelength range, as well as lines from TiII, NiII, and CrII. We tested the template by fitting it to AGN spectra spanning a broad range of iron emission properties, and we present a detailed comparison with fits using other widely used monolithic and multicomponent iron emission templates. The new template generally provides the best fit (lowest {chi}2) compared to other widely used monolithic empirical templates. In addition, the new template yields more accurate spectral measurements including a significantly better match of the derived Balmer line profiles (H{beta}, H{gamma}, H{delta}), in contrast with results obtained using the other templates. Our comparison tests show that the choice of iron template can introduce a systematic bias in measurements of the H{beta} line width, which consequently impacts single-epoch black hole mass estimates by ~0.1dex on average and possibly up to ~0.3-0.5dex individually.2022ApJS..258...38Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/258/38CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)VII/289 : SDSS quasar catalog, sixteenth data release (DR16Q) (Lyke+, 2020)J/ApJS/145/199 : Optical spectroscopic atlas of low-z AGN (Marziani+, 2003)J/ApJS/152/251 : Indo-US library of coude feed stellar spectra (Valdes+, 2004)J/A+A/417/515 : I Zw 1 unusual emission line spectrum (Veron-Cetty+, 2004)J/ApJ/670/92 : New sample of low-mass black holes in AGN (Greene+, 2007)J/MNRAS/383/581 : Broad-line Balmer decrements in blue AGN (Dong+, 2008)J/ApJ/687/78 : FeII emission in quasars (Hu+, 2008)J/ApJ/680/169 : SDSS DR5 virial black hole masses (Shen+, 2008)J/ApJ/674/668 : SDSS J102839.11+450009.4 Fe II emission lines (Wang+, 2008)J/ApJS/189/15 : FeII emission in a sample of AGN spectra (Kovacevic+, 2010)J/ApJ/736/86 : FeII emission in SDSS type 1 AGNs (Dong+, 2011)J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)J/ApJ/746/169 : Luminosity function of broad-line quasars (Shen+, 2012)J/ApJ/753/125 : NIR spectroscopy follow-up of 60 SDSS-DR7 QSOs (Shen+, 2012)J/ApJ/764/45 : Luminosity function of broad-line quasars. II. (Kelly+, 2013)J/ApJ/793/108 : SEAMBHs. II. Continuum and Hbeta LCs (Wang+, 2014)J/ApJS/217/26 : Lick AGN monitoring 2011: light curves (Barth+, 2015)J/ApJ/809/20 : M_BH_-{sigma} relation for active galaxies (Bennert+, 2015)J/ApJ/837/131 : Space telescope RM project. V. NGC5548 sp. (Pei+, 2017)J/ApJS/239/22 : NIR obs. of AGNs in COSMOS, SXDS & E-CDF-S (Schulze+, 2018)J/ApJ/876/102 : Reverberation mapping of the Seyfert Zw I 1 (Huang+, 2019)J/ApJ/887/135 : V-band, 5100{AA} and broad emission LCs of Mrk 79 (Lu+, 2019)J/ApJ/886/93 : SAMP. III. Opt. LCs and spectra of two AGNs (Rakshit+, 2019)J/ApJS/249/17 : SDSS QSO DR14 spectral properties (Rakshit+, 2020)J/ApJS/253/20 : SEAMBHs XII. Reberberation mapping for 15 PG QSOs (Hu+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/258/38https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/258/38http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/258/38https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/258/38https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/258/38http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/258/38GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/258/38/table2 (Test from the SDSS DR7 quasar catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/258/38/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/258/38/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/258/38/table2?GETtext/xml+votable180.050000true50.5578750.92038890.0055555555555555566/4130 4254 4693 5262 5529 5607 6270 6391 6511 7176 7225 7254 7526 7558 8449 8848 8894 8977 9018 9064 9260 9283 10092 10330 10828 11061 11181 11291 17213 21879 23216 23418 26500 26583 27023 27909 28351 28666 31291https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/258/38?format=asciiUVOpticaldefaultJ/ApJS/258/38/table1Iron template spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[4000/5600] Wavelength; Angstroms0.1nmem.wlintFlux[3e-05/0.75] Flux density; in 10^-15^erg/s/cm^2^/Angstroms1e-13W.m**-2.nm**-1phot.fluxdoublee_Flux[0.0005/0.1] Uncertainty in Flux1e-13W.m**-2.nm**-1stat.error;phot.fluxdoubleJ/ApJS/258/38/table2Test from the SDSS DR7 quasar catalogDR16QDisplay data from the SDSS DR16 quasar catalog (VII/289) within 0.5"meta.ref.urlcharSpInteractive spectrum from SDSSmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlchar_RAPositions from SDSS names (right ascension part)degpos.eq.ra;meta.main_DEPositions from SDSS names (declination part)degpos.eq.dec;meta.mainIDObject identifier (1)meta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPlate[276/2783] SDSS Plate numbermeta.id;instr.plateintMJD[51884/54584] Modified Julian Date of SDSS observationtime.epochintFiber[4/639] SDSS Fiber numbermeta.idintz[0.06/0.6] Derived spectroscopic redshiftsrc.redshiftfloatFWHM[1303/11098] Full-Width at Half-Maximum of broad H{beta} linekm/sspect.line.widthintRFeII[0.13/2.73] Ratio of equivalent widths of Fe within 4435-4685{AA} to broad H{beta}spect.line.eqWidth;arith.ratiofloatSDSSSDSS DR7 identifier (JHHMMSS.ss+DDMMSS.s)meta.id;meta.mainchar