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The Lick AGN Monitoring Project 2011: Reverberation Mapping of Markarian 50

Barth, Aaron J. and Walters, Richard (2011) The Lick AGN Monitoring Project 2011: Reverberation Mapping of Markarian 50. Astrophysical Journal Letters, 743 (1). Art. No. L4. ISSN 2041-8205.

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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 τ_(cen) = 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) × 10^7 M_☉. These observations demonstrate that Mrk 50 is among the most promising nearby active galaxies for detailed investigations of BLR structure and dynamics.

Item Type:Article
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URLURL TypeDescription
Barth, Aaron J.0000-0002-3026-0562
Walters, Richard0000-0002-1835-6078
Additional Information:© 2011 The American Astronomical Society. Received 2011 September 28; accepted 2011 October 31; published 2011 November 14. We are extremely grateful to the Lick Observatory staff for their outstanding support during our observing run. The Lick AGN Monitoring Project 2011 is supported by NSF grants AST- 1107812, 1107865, 1108665, and 1108835. T.T. acknowledges a Packard Research Fellowship. The West Mountain Observatory receives support from NSF grant AST-0618209. We thank Brad Peterson for a helpful referee report. Facilities: Shane (Kast), KAIT, BYU:0.9m, PO:1.5m, LCOGT (FTS), SO:Super-LOTIS
Funding AgencyGrant Number
David and Lucile Packard FoundationUNSPECIFIED
Subject Keywords: galaxies: active; galaxies: individual (Mrk 50); galaxies: nuclei
Issue or Number:1
Record Number:CaltechAUTHORS:20111223-113900343
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Official Citation: The Lick AGN Monitoring Project 2011: Reverberation Mapping of Markarian 50 Aaron J. Barth et al. 2011 ApJ 743 L4
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:28593
Deposited By: Ruth Sustaita
Deposited On:03 Jan 2012 16:41
Last Modified:09 Mar 2020 13:19

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