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25 April 2024

» arxiv » 1409.0058

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Reverberation Mapping of the Kepler-Field AGN KA1858+4850
Liuyi Pei ; Aaron J. Barth ; Greg S. Aldering ; Michael M. Briley ; Carla J. Carroll ; Daniel J. Carson ; S. Bradley Cenko ; Kelsey I. Clubb ; Daniel P. Cohen ; Antonino Cucchiara ; Tyler D. Desjardins ; Rick Edelson ; Jerome J. Fang ; Joseph M. Fedrow ; Alexei V. Filippenko ; Ori D. Fox ; Amy Furniss ; Elinor L. Gates ; Michael Gregg ; Scott Gustafson ; J. Chuck Horst ; Michael D. Joner ; Patrick L. Kelly ; Mark Lacy ; C. David Laney ; Douglas C. Leonard ; Weidong Li ; Matthew A. Malkan ; Bruce Margon ; Marcel Neeleman ; My L. Nguyen ; J. Xavier Prochaska ; Nathaniel R. Ross ; David J. Sand ; Kinchen J. Searcy ; Isaac S. Shivvers ; Jeffrey M. Silverman ; Graeme H. Smith ; Nao Suzuki ; Krista Lynne Smith ; David Tytler ; Jessica K. Werk ; Gabor Worseck ;
Date:	30 Aug 2014
Abstract:	KA1858+4850 is a narrow-line Seyfert 1 galaxy at redshift 0.078 and is among the brightest active galaxies monitored by the Kepler mission. We have carried out a reverberation mapping campaign designed to measure the broad-line region size and estimate the mass of the black hole in this galaxy. We obtained 74 epochs of spectroscopic data using the Kast Spectrograph at the Lick 3-m telescope from February to November of 2012, and obtained complementary V-band images from five other ground-based telescopes. We measured the H-beta light curve lag with respect to the V-band continuum light curve using both cross-correlation techniques (CCF) and continuum light curve variability modeling with the JAVELIN method, and found rest-frame lags of lag_CCF = 13.53 (+2.03, -2.32) days and lag_JAVELIN = 13.15 (+1.08, -1.00) days. The H-beta root-mean-square line profile has a width of sigma_line = 770 +/- 49 km/s. Combining these two results and assuming a virial scale factor of f = 5.13, we obtained a virial estimate of M_BH = 8.06 (+1.59, -1.72) x 10^6 M_sun for the mass of the central black hole and an Eddington ratio of L/L_Edd ~ 0.2. We also obtained consistent but slightly shorter emission-line lags with respect to the Kepler light curve. Thanks to the Kepler mission, the light curve of KA1858+4850 has among the highest cadences and signal-to-noise ratios ever measured for an active galactic nucleus; thus, our black hole mass measurement will serve as a reference point for relations between black hole mass and continuum variability characteristics in active galactic nuclei.
Source:	arXiv, 1409.0058
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