Aaron J. Barth, University of California - Irvine
Anna Pancoast, University of California - Santa Barbara
Shawn J. Thorman, University of California - Irvine
Vardha N. Bennert, California Polytechnic State University, San Luis ObispoFollow
David J. Sand, University of California - Santa Barbara
Weidong Li, University of California - Berkeley
Gabriela Canalizo, University of California - Riverside
Alexei V. Filippenko, University of California - Berkeley
Elinor L. Gates, Lick Observatory
Jenny E. Greene, Princeton University
Matthew A. Malkan, University of California - Los Angeles
Daniel Stern, California Institute of Technology
Tommaso Treu, University of California - Santa Barbara
Jong-Hak Woo, Seoul National University
Roberto J. Assef, California Institute of Technology
Hyun-Jin Bae, Yonsei University
Brendon J. Brewer, University of California - Santa Barbara
Tabitha Buehler, Brigham Young University - Utah
S. Bradley Cenko, University of California - Berkeley
Kelsey I. Clubb, University of California - Berkeley
Michael C. Cooper, University of California - Irvine
Aleksandar M. Diamond-Stanic, University of California - San Diego
Kyle D. Hiner, University of California - Riverside
Sebastian F. Hönig, University of California - Santa Barbara
Michael D. Joner, Brigham Young University - Utah
Michael T. Kandrashoff, University of California - Berkeley
C. David Laney, Brigham Young University - Utah
Mariana S. Lazarova, University of California - Riverside
A. M. Nierenberg, University of California - Santa Barbara
Dawoo Park, Seoul National University
Jeffrey M. Silverman, University of California - Berkeley
Donghoon Son, Seoul National University
Alessandro Sonnenfeld, University of California - Santa Barbara
Erik J. Tollerud, University of California - Irvine
Jonelle L. Walsh, University of California - Irvine
Richard Walters, California Institute of Technology
Robert L. da Silva, University of California - Santa Cruz
Michele Fumagalli, University of California - Santa Cruz
Michael D. Gregg, University of California - Davis
Chelsea E. Harris, University of California - Santa Barbara
Eric Y. Hsiao, Lawrence Berkeley National Laboratory
Jeffrey Lee, University of California - San Diego
Liliana Lopez, University of California - San Diego
Jacob Rex, University of California - Berkeley
Nao Suzuki, Lawrence Berkeley National Laboratory
Jonathan R. Trump, University of California - Santa Cruz
David Tytler, University of California - San Diego
Gábor Worseck, University of California - Santa Cruz
Hassan M. Yesuf, University of California - Santa Cruz

Abstract

The Lick AGN Monitoring Project 2011 observing campaign was carried out over the course of 11 weeks in spring 2011. Here we present the first results from this program, a measurement of the broad-line reverberation lag in the Seyfert 1 galaxy Mrk 50. Combining our data with supplemental observations obtained prior to the start of the main observing campaign, our data set covers a total duration of 4.5 months. During this time, Mrk 50 was highly variable, exhibiting a maximum variability amplitude of a factor of ~4 in the U-band continuum and a factor of ~2 in the Hβ line. Using standard cross-correlation techniques, we find that Hβ and Hγ lag the V-band continuum by τcen = 10.64+0.82 – 0.93 and 8.43+1.30 – 1.28 days, respectively, while the lag of He II λ4686 is unresolved. The Hβ line exhibits a symmetric velocity-resolved reverberation signature with shorter lags in the high-velocity wings than in the line core, consistent with an origin in a broad-line region (BLR) dominated by orbital motion rather than infall or outflow. Assuming a virial normalization factor of f = 5.25, the virial estimate of the black hole mass is (3.2 ± 0.5) × 107 M ☉. These observations demonstrate that Mrk 50 is among the most promising nearby active galaxies for detailed investigations of BLR structure and dynamics.

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Physics

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URL: https://digitalcommons.calpoly.edu/phy_fac/390