J/ApJ/756/73ivo://CDS.VizieR/J/ApJ/756/73doi:10.26093/cds/vizier.17560073CDSEdri H.Rafter S.E.Chelouche D.Kaspi S.Behar E.2017-06-19T07:57:27Z2014-04-30T14:12:08ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiinfrared-photometryvisible-astronomybroad-band-photometryWe present results of broadband photometric reverberation mapping (RM) to measure the radius of the broad-line region, and subsequently the black hole mass (M_BH_), in the nearby, low-luminosity active galactic nuclei NGC 4395. Using the Wise Observatory's 1m telescope equipped with the Sloan Digital Sky Survey g', r', and i' broadband filters, we monitored NGC 4395 for nine consecutive nights and obtained three light curves each with over 250 data points. The g' and r' bands include time variable contributions from H{beta} and H{alpha}, respectively, plus continuum. The i' band is free of broad lines and covers exclusively continuum. We show that by looking for a peak in the difference between the cross-correlation and the auto-correlation functions for all combinations of filters, we can get a reliable estimate of the time lag necessary to compute M_BH_. We measure the time lag for H{alpha} to be 3.6+/-0.8hr, comparable to previous studies using the line-resolved spectroscopic RM method. We argue that this lag implies a black hole mass of M_BH_=(4.9+/-2.6)x10^4^M_{sun}_.2012ApJ...756...73Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/756/73CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/753/L2 : Reverberation mapping of AGNs (Assef+, 2012)J/A+A/529/A25 : Phot. of star clusters in 5 nearby gal. (Silva-Villa+, 2011)J/AJ/142/122 : SDSS DR7 galaxy/QSOs pairs (Cherinka+, 2011)J/MNRAS/407/2399 : AGN activity and black hole mass (McKernan+, 2010)J/ApJ/650/88 : NGC4395 light curves. III. (Desroches+, 2006)J/ApJ/641/L21 : Black hole mass & velocity dispersion relation (Greene+, 2006)J/ApJ/632/799 : NGC4395 light curves (Peterson+, 2005)J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)J/A+A/391/809 : HII regions in NGC 5457 and NGC 4395 (Cedres+, 2002)J/A+A/390/863 : CCD R Photometry of WHISP Dwarf Galaxies (Swaters, 2002)J/ApJS/143/257 : AGN emission line properties (Kuraszkiewicz+, 2002)J/ApJS/112/315 : Spectroscopic parameters of Seyfert nuclei (Ho+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/756/73https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/756/73http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/756/73https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/756/73https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/756/73http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/756/73GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJ/756/73/table1Photometric light curves for NGC 4395recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFiltSDSS filter used in the observation (g, r, i)instr.setup;obscharJDJulian Date of the observationdtime.epochdoublemag[16.14/17.37] Observed magnitude in Filtmagphot.magfloate_mag[0.01/0.06] Uncertainty in magmagstat.error;phot.magfloat