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The lick AGN monitoring project 2011: reverberation mapping of markarian 50
The Astrophysical Journal Letters
  • 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 Obispo
  • 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
Publication Date
12-10-2011
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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Citation Information
Aaron J. Barth, Anna Pancoast, Shawn J. Thorman, Vardha N. Bennert, et al.. "The lick AGN monitoring project 2011: reverberation mapping of markarian 50" The Astrophysical Journal Letters Vol. 743 Iss. 1 (2011) p. 1 - 7
Available at: http://works.bepress.com/vbennert/4/