The Mass of the Black Hole in the Seyfert 1 Galaxy NGC 4593 from Reverberation Mapping

Kelly D. Denney; Misty C. Bentz; Bradley M. Peterson; Richard W. Pogge; Edward M. Cackett; Matthias Dietrich; Jeffrey K. J. Fogel; Himel Ghosh; Keith D. Horne; Charles Kuehn; Takeo Minezaki; Christopher A. Onken; Vladimir I. Pronik; Douglas O. Richstone; Sergey G. Sergeev; Marianne Vestergaard; Matthew G. Walker; Yuzuru Yoshii

doi:10.1086/508533

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The Mass of the Black Hole in the Seyfert 1 Galaxy NGC 4593 from Reverberation Mapping

Kelly D. Denney¹, Misty C. Bentz¹, Bradley M. Peterson¹, Richard W. Pogge¹, Edward M. Cackett², Matthias Dietrich¹, Jeffrey K. J. Fogel³, Himel Ghosh¹, Keith D. Horne², Charles Kuehn^1,4, Takeo Minezaki⁵, Christopher A. Onken^1,6, Vladimir I. Pronik^7,8, Douglas O. Richstone³, Sergey G. Sergeev^7,8, Marianne Vestergaard⁹, Matthew G. Walker³, and Yuzuru Yoshii^5,10

© 2006. The American Astronomical Society. All rights reserved. Printed in U.S.A.
The Astrophysical Journal, Volume 653, Number 1 Citation Kelly D. Denney et al 2006 ApJ 653 152 DOI 10.1086/508533

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Author affiliations

¹ Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210

² School of Physics and Astronomy, University of St. Andrews, Fife, KY16 9SS, Scotland, UK

³ Department of Astronomy, University of Michigan, Ann Arbor, MI 48109-1090

⁴ Current address: Department of Physics and Astronomy, 3270 Biomedical Physical Sciences Building, Michigan State University, East Lansing, MI 48824

⁵ Institute of Astronomy, School of Science, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan

⁶ Current address: National Research Council Canada, Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria, BC V9E 2E, Canada

⁷ Crimean Astrophysical Observatory, Nauchny Post Office, 98409 Crimea, Ukraine

⁸ Isaak Newton Institute of Chile, Crimean Branch, Ukraine

⁹ Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721

¹⁰ Research Center for the Early Universe, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

Dates

Received 2006 July 20
Accepted 2006 August 18

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Abstract

We present new observations leading to an improved black hole mass estimate for the Seyfert 1 galaxy NGC 4593 as part of a reverberation-mapping campaign conducted at the MDM Observatory. Cross-correlation analysis of the Hβ emission-line light curve with the optical continuum light curve reveals an emission-line time delay of τ_cent = 3.73 ± 0.75 days. By combining this time delay with the Hβ line width, we derive a central black hole mass of M_BH = (9.8 ± 2.1) × 10⁶ M_☉, an improvement in precision of a factor of several over past results.

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