The Lick AGN Monitoring Project 2011: Reverberation Mapping of Markarian 50
A. J. Barth, A. Pancoast, S. J. Thorman, V. N. Bennert, D. J. Sand, W., Li, G. Canalizo, A. V. Filippenko, E. L. Gates, J. E. Greene, M. A. Malkan,, D. Stern, T. Treu, J.-H. Woo, R. J. Assef, H.-J. Bae, B. J. Brewer, T., Buehler, S. B. Cenko, K. I. Clubb, M. C. Cooper

TL;DR
This study measures the time delays in emission lines of galaxy Mrk 50 to estimate its black hole mass and understand the broad-line region's structure, using a dedicated 11-week reverberation mapping campaign.
Contribution
First reverberation mapping of Mrk 50 providing detailed measurements of emission line lags and black hole mass estimation.
Findings
H-beta lag: 10.64 days, H-gamma lag: 8.43 days
Black hole mass estimated at 3.2 x 10^7 solar masses
Broad-line region shows orbital motion dominance
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 dataset 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 H-beta line. Using standard cross-correlation techniques, we find that H-beta and H-gamma lag the V-band continuum by tau_cen = 10.64(-0.93,+0.82) and 8.43(-1.28,+1.30) days, respectively, while the lag of He II 4686 is unresolved. The H-beta line exhibits a symmetric velocity-resolved reverberation signature with shorter lags in…
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