J/ApJ/884/103ivo://CDS.VizieR/J/ApJ/884/103doi:10.26093/cds/vizier.18840103CDSKim J.Im M.Choi C.Hwang S.2021-09-08T13:19:18Z2021-04-19T08:57:35ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleivisible-astronomyh-alpha-photometryReverberation mapping (RM) is one of the most efficient ways to investigate the broad-line region around the central supermassive black holes of active galactic nuclei (AGNs). A common way of performing the RM is to perform a long term spectroscopic monitoring of AGNs, but the spectroscopic monitoring campaign of a large number of AGNs requires an extensive amount of observing time of medium to large size telescopes. As an alternative way, we present the results of photometric RM with medium-band photometry. As the widths of medium-band filters match well with the widths of AGN broad emission lines, the medium-band observation with small telescopes can be a cost-effective way to perform RM. We monitored five nearby AGNs with available spectroscopic RM results showing days to weeks scale variability. Observations were performed for ~3 months with an average of 3 days cadence using three medium-band filters on a 0.43m telescope. The time lags between the continuum and the H{alpha} emission line light curves are calculated using the JAVELIN software and the discrete correlation function. We find time lags of 1.5-15.9d for these AGNs, which are consistent with the time lags derived from previous spectroscopic RM measurements. This result demonstrates that even a 0.5m class telescope can perform RM with medium-bands. Furthermore, we show that RM for tens of thousands AGNs is possible with a dedicated 1m class telescope.2019ApJ...884..103Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/884/103CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/88 : Stellar Spectrophotometric Atlas (Gunn+ 1983)VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)J/AJ/131/2766 : Quasar luminosity function from SDSS-DR3 (Richards+, 2006)J/ApJS/173/185 : GALEX ultraviolet atlas of nearby galaxies (Gil de Paz+, 2007)J/ApJ/698/895 : Variations in QSOs optical flux (Kelly+, 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/755/60 : Reverberation mapping for 5 Seyfert 1 galaxies (Grier+, 2012)J/ApJ/782/45 : SEAMBHs. I. Mrk 142, Mrk 335, and IRAS F12397+3333 (Du+, 2014)J/ApJ/795/149 : Reverberation mapping of NGC 7469 (Peterson+, 2014)J/ApJS/217/26 : Lick AGN monitoring 2011: light curves (Barth+, 2015)J/ApJ/806/22 : SEAMBHs IV. H{beta} time lags (Du+, 2015)J/ApJ/801/45 : QSO properties and reverberation mapping (Hernitschek+, 2015)J/ApJ/806/109 : Rest-frame optical spectra of 3<z<6 QSOs (Jun+, 2015)J/ApJS/216/17 : AKARI 2.5-5um spectra of nearby Type-1 AGNs (Kim+, 2015)J/ApJ/818/30 : Lag measurements for 15 z<0.8 QSOs from SDSS-RM (Shen+, 2016)J/ApJ/840/97 : Opt. reverberation mapping of 5 AGNs (Fausnaugh+, 2017)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/865/56 : Emission line & R-band continuum LCs of 17 QSOs (Lira+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/884/103https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/884/103http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/884/103https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/884/103https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/884/103http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/884/103GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/884/103/table1 (List of the monitored AGNs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/884/103/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/884/103/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/884/103/table1?GETtext/xml+votable180.050000true180.309583-3.6780830.0055555555555555566/19283 25054 25585 26148 297952.9428824536832145e-19 2.9428824536832145e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/884/103?format=asciiOpticaldefaultJ/ApJ/884/103/table1List of the monitored AGNsNameAGN namemeta.id;meta.maincharprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainVmag[12.34/15.89] V magnitudemagphot.mag;em.opt.Vfloatr_VmagReference for Vmag (1)meta.ref;pos.framecharz[0.005/0.019] Redshiftsrc.redshiftfloatNep[28/53] Number of epochsmeta.numberintTime[2/3.4] Average time spacingdtime.intervalfloatStartMonitoring starttime.epochnullableEndMonitoring end (Month and Day)time.epochcharNpNumber of photometric measurements for this AGN (link to Table 2)meta.numberintnullableLCInteractive LC plotmeta.ref.urlcharLCcInteractive continuum LC plotmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlcharLEDAmeta.ref.urlcharJ/ApJ/884/103/table2The continuum and the H{alpha} emission line light curve of five nearby AGNsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameAGN namemeta.id;meta.maincharMJD[57873.4/58006.4] Modified Julian date of observationdtime.epochdoublem625mag[13.14/15.2] Apparent AB magnitude in LSGT/SNUCAM m625 band (596.2-658.7nm)magphot.mag;em.optdoublee_m625mag[0.0013/0.03] Uncertainty in m625magmagstat.error;phot.magdoublem675mag[11.68/14.86] Apparent AB magnitude in LSGT/SNUCAM m675 band (643.3-712.0nm)magphot.mag;em.optdoublee_m675mag[0.001/0.022] Uncertainty in m675magmagstat.error;phot.magdoublem725mag[12/15.1] Apparent AB Magnitude in LSGT/SNUCAM m725 band (693.6-754.8nm)magphot.mag;em.optdoublee_m725mag[0.0013/0.03] Uncertainty in m725magmagstat.error;phot.magdoubleCont[0.38/4.41] The 675nm continuum flux (1)cJyphot.fluxdoublee_Cont[0.004/0.07] Uncertainty in Cont (1)cJystat.errordoubleHa[0.08/4.5] H_{alpha}_ flux (1)cJyphot.flux;em.line.Halphadoublee_Ha[0.0028/0.04] Uncertainty in Ha (1)cJystat.errordouble