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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Broad-line reverberation in the Kepler-field Seyfert galaxy Zw 229-015
Astrophysical Journal, Volume 732, No. 2, Article 121, Year 2011
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Description
The Seyfert 1 galaxy Zw 229-015 is among the brightest active galaxies being monitored by the Kepler mission. In order to determine the black hole mass in Zw 229-015 from Hβ reverberation mapping, we have carried out nightly observations with the Kast Spectrograph at the Lick 3 m telescope during the dark runs from 2010 June through December, obtaining 54 spectroscopic observations in total. We have also obtained nightly V-band imaging with the Katzman Automatic Imaging Telescope at Lick Observatory and with the 0.9 m telescope at the Brigham Young University West Mountain Observatory over the same period. We detect strong variability in the source, which exhibited more than a factor of two change in broad Hβ flux. From cross-correlation measurements, we find that the Hβ light curve has a rest-frame lag of 3.86+0.69 -0.90 days with respect to the V-band continuum variations. We also measure reverberation lags for Hα and Hγ and find an upper limit to the Hδ lag. Combining the Hβ lag measurement with a broad Hβ width of σline = 1590 ± 47 km s-1 measured from the rms variability spectrum, we obtain a virial estimate of M BH = 1.00+0.19 -0.24 × 107 M⊙ for the black hole in Zw 229-015. As a Kepler target, Zw 229-015 will eventually have one of the highest-quality optical light curves ever measured for any active galaxy, and the black hole mass determined from reverberation mapping will serve as a benchmark for testing relationships between black hole mass and continuum variability characteristics in active galactic nuclei. © 2011. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Barth, Aaron J.
United States, Irvine
University of California, Irvine
Nguyen, My L.
United States, Irvine
University of California, Irvine
Malkan, Matthew A.
United States, Los Angeles
University of California, Los Angeles
Filippenko, Alexei V.
United States, Berkeley
University of California, Berkeley
Li, Weidong
United States, Berkeley
University of California, Berkeley
Gorjian, Varoujan
United States, Pasadena
Jet Propulsion Laboratory
Joner, Michael D.
United States, Provo
Brigham Young University
Bennert, Vardha Nicola
United States, Santa Barbara
University of California, Santa Barbara
Cenko, Stephen Bradley
United States, Berkeley
University of California, Berkeley
Childress, Michael J.
United States, Berkeley
Lawrence Berkeley National Laboratory
Comerford, Julia M.
United States, Austin
The University of Texas at Austin
Fumagalli, Michele
United States, Santa Cruz
University of California, Santa Cruz
Ganeshalingam, Mohan
United States, Berkeley
University of California, Berkeley
Gates, Elinor L.
United States, Mount Hamilton
Lick Observatory
Hintz, Eric G.
United States, Provo
Brigham Young University
Hsiao, Eric Y.
United States, Berkeley
Lawrence Berkeley National Laboratory
Kandrashoff, Michael T.
United States, Berkeley
University of California, Berkeley
Keel, William C.
United States, Tuscaloosa
The University of Alabama
Laney, Clifton David
United States, Provo
Brigham Young University
Lowe, Thomas B.
United States, Mount Hamilton
Lick Observatory
Moody, Joseph Ward
United States, Provo
Brigham Young University
Nierenberg, Anna M.
United States, Santa Barbara
University of California, Santa Barbara
Nugent, Peter E.
United States, Berkeley
University of California, Berkeley
United States, Berkeley
Lawrence Berkeley National Laboratory
Pancoast, Anna
United States, Santa Barbara
University of California, Santa Barbara
Rich, Robert Michael
United States, Los Angeles
University of California, Los Angeles
Silverman, Jeffrey M.
United States, Berkeley
University of California, Berkeley
Sonnenfeld, Alessandro
United States, Santa Barbara
University of California, Santa Barbara
Walsh, Jonelle L.
United States, Irvine
University of California, Irvine
Woo, Jong-hak
South Korea, Seoul
Seoul National University
Statistics
Citations: 77
Authors: 29
Affiliations: 17
Identifiers
Doi:
10.1088/0004-637X/732/2/121
ISSN:
0004637X