J/ApJ/892/93ivo://CDS.VizieR/J/ApJ/892/93doi:10.26093/cds/vizier.18920093CDSCho H.Woo J.-H.Hodges-kluck E.Son D.Shin J.Gallo E.Bae H.-J.,Brink T.G.Cho W.Filippenko A.V.Horst J.C.Ilic D.Joner M.D.,Kang D.Kang W.Kaspi S.Kim T.Kovacevic A.B.Kumar S.Le H.A.N.,Nadzhip A.E.Pozo Nunez F.Metlov V.G.Oknyansky V.L.Park S.,Popovic L.C.Rakshit S.Schramm M.Shatsky N.I.Spencer M.Sung E.-C.,Sung H.-I.Tatarnikov A.M.Vince O.2022-01-19T09:00:14Z2021-09-13T16:08:38ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiultraviolet-photometryvisible-astronomyh-alpha-photometryinfrared-photometryWe present a variability study of the lowest-luminosity Seyfert 1 nucleus of the galaxy NGC 4395 based on photometric monitoring campaigns in 2017 and 2018. Using 22 ground-based and space telescopes, we monitored NGC 4395 with a ~5-minute cadence during a period of 10 days and obtained light curves in the ultraviolet (UV), V, J, H, and K/K_s_ bands, as well as narrowband H{alpha}. The rms variability is ~0.13mag in the Swift UVM2 and V filter light curves, decreasing down to ~0.01mag in the K filter. After correcting for the continuum contribution to the H{alpha} narrow band, we measured the time lag of the H{alpha} emission line with respect to the V-band continuum as 55_-31_^+27^-122_-67_^+33^min in 2017 and 49_-14_^+15^-83_-14_^+13^min in 2018, depending on assumptions about the continuum variability amplitude in the H{alpha} narrow band. We obtained no reliable measurements for the continuum-to-continuum lag between UV and V bands and among near-IR bands, owing to the large flux uncertainty of UV observations and the limited time baseline. We determined the active galactic nucleus (AGN) monochromatic luminosity at 5100{AA}, {lambda}L_{lambda}_=(5.75+/-0.40)x10^39^erg/s, after subtracting the contribution of the nuclear star cluster. While the optical luminosity of NGC 4395 is two orders of magnitude lower than that of other reverberation-mapped AGNs, NGC 4395 follows the size-luminosity relation, albeit with an offset of 0.48dex (>=2.5{sigma}) from the previous best-fit relation of Bentz+ 2013ApJ...767..149B2020ApJ...892...93Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/892/93CatalogResearchIsServedByTAP VizieR generic servicerelated-toIII/116 : Spectrophotometric Standards (Massey+ 1988)J/A+AS/131/1 : BVI photometry of 5 CVn cloud galaxies (Karachentsev+ 1998)J/A+A/391/809 : HII regions in NGC 5457 and NGC 4395 (Cedres+, 2002)J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)J/AJ/130/873 : Properties of BQS objects in the SDSS DR3 area (Jester+, 2005)J/ApJ/632/799 : NGC4395 light curves (Peterson+, 2005)J/ApJ/650/88 : NGC4395 light curves. III. (Desroches+, 2006)J/ApJS/185/156 : The Lick AGN monitoring project (Walsh+, 2009)J/ApJ/716/993 : LAMP: reverberation mapping of H and He lines (Bentz+, 2010)J/ApJ/756/73 : gri LCs of the low-luminosity AGN NGC 4395 (Edri+, 2012)J/ApJ/775/116 : z<0.06 active black hole galaxies from SDSS-DR8 (Reines+, 2013)J/ApJ/825/126 : SEAMBHs. V. The third year (Du+, 2016)J/ApJ/851/21 : SDSS RM project first year of observations (Grier+, 2017)J/ApJ/856/6 : SEAMBHs IX. 10 new H{beta} light curves (Du+, 2018)J/ApJ/858/118 : Kinematic data of 3 nearby low-mass galaxies (Nguyen+, 2018)J/ApJ/871/108 : Lick AGN monitoring project 2011: V band (Pancoast+, 2019)J/ApJ/886/93 : SAMP. III. Opt. LCs and spectra of two AGNs (Rakshit+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/892/93https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/892/93http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/892/93https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/892/93https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/892/93http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/892/93GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVOpticalInfrareddefaultJ/ApJ/892/93/table2Photometry DatarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Date of observation, MJD-50000.0dtime.epochdoubleBandObservation band (UVM2, V, Ha, J, H, K)instr.bandpass;obscharmagApparent magnitude in Bandmagphot.magfloate_magThe 1{sigma} uncertainty in magmagstat.error;phot.magfloatTelTelescope identifier (1)meta.id;instr.telchar