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Title: Reverberation mapping of the Kepler field AGN KA1858+4850

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 2012 February to November, and obtained complementary V-band images from five other ground-based telescopes. We measured the Hβ 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 τ{sub CCF}=13.53{sub −2.32}{sup +2.03} days and τ {sub JAVELIN} =13.15{sub −1.00}{sup +1.08} days. The Hβ rms line profile has a width of σ{sub line} = 770 ± 49 km s{sup –1}. Combining these two results and assuming a virial scale factor of f = 5.13, we obtained a virial estimate of M{sub BH}=8.06{sub −1.72}{sup +1.59}×10{sup 6}M{sub ⊙} for the mass of the central black hole and an Eddington ratio of L/L {sub Edd} ≈ 0.2. We also obtained consistent but slightly shorter emission-line lags withmore » 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.« less
Authors:
; ;  [1] ; ;  [2] ;  [3] ;  [4] ; ;  [5] ; ; ; ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] ;  [12] ;  [13] more »; « less
  1. Department of Physics and Astronomy, University of California, Irvine, CA, 92697 (United States)
  2. Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States)
  3. Department of Physics and Astronomy, Appalachian State University, Boone, NC 28608 (United States)
  4. Department of Physics and Astronomy, N283 ESC, Brigham Young University, Provo, UT 84602 (United States)
  5. Department of Astronomy, University of Maryland, College Park, MD 20742 (United States)
  6. Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States)
  7. Department of Physics and Astronomy, The University of Western Ontario, London, ON N6A 3K7 (Canada)
  8. Department of Astronomy and Astrophysics, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064 (United States)
  9. Department of Astronomy, San Diego State University, San Diego, CA 92182 (United States)
  10. Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305 (United States)
  11. Lick Observatory, P.O. Box 85, Mt. Hamilton, CA 95140 (United States)
  12. Department of Physics, University of California, Davis, One Shields Avenue, Davis, CA 95616 (United States)
  13. Department of Physics, University of California, San Diego, La Jolla, CA 92093 (United States)
Publication Date:
OSTI Identifier:
22370320
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 795; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BLACK HOLES; CORRELATIONS; DESIGN; EMISSION; GALAXIES; GALAXY NUCLEI; IMAGES; MASS; RED SHIFT; SEYFERT GALAXIES; SIGNAL-TO-NOISE RATIO; SIMULATION; TELESCOPES; VISIBLE RADIATION