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The lick AGN monitoring project 2011: Reverberation mapping of Markarian 50

  • Author(s): Barth, AJ
  • Pancoast, A
  • Thorman, SJ
  • Bennert, VN
  • Sand, DJ
  • Li, W
  • Canalizo, G
  • Filippenko, AV
  • Gates, EL
  • Greene, JE
  • Malkan, MA
  • Stern, D
  • Treu, T
  • Woo, JH
  • Assef, RJ
  • Bae, HJ
  • Brewer, BJ
  • Buehler, T
  • Cenko, SB
  • Clubb, KI
  • Cooper, MC
  • Diamond-Stanic, AM
  • Hiner, KD
  • Hönig, SF
  • Joner, MD
  • Kandrashoff, MT
  • Laney, CD
  • Lazarova, MS
  • Nierenberg, AM
  • Park, D
  • Silverman, JM
  • Son, D
  • Sonnenfeld, A
  • Tollerud, EJ
  • Walsh, JL
  • Walters, R
  • Da Silva, RL
  • Fumagalli, M
  • Gregg, MD
  • Harris, CE
  • Hsiao, EY
  • Lee, J
  • Lopez, L
  • Rex, J
  • Suzuki, N
  • Trump, JR
  • Tytler, D
  • Worseck, G
  • Yesuf, HM
  • et al.

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 Mrk50. 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, Mrk50 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- 1.28days, 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 Mrk50 is among the most promising nearby active galaxies for detailed investigations of BLR structure and dynamics. © 2011. The American Astronomical Society. All rights reserved.

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