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Title:
A Reverberation-based Mass for the Central Black Hole in NGC 4151
Authors:
Bentz, Misty C.; Denney, Kelly D.; Cackett, Edward M.; Dietrich, Matthias; Fogel, Jeffrey K. J.; Ghosh, Himel; Horne, Keith; Kuehn, Charles; Minezaki, Takeo; Onken, Christopher A.; Peterson, Bradley M.; Pogge, Richard W.; Pronik, Vladimir I.; Richstone, Douglas O.; Sergeev, Sergey G.; Vestergaard, Marianne; Walker, Matthew G.; Yoshii, Yuzuru
Affiliation:
AA(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210; , , , , , .), AB(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210; , , , , , .), AC(School of Physics and Astronomy, University of St. Andrews, Fife KY16 9SS, Scotland, UK; , .), AD(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210; , , , , , .), AE(Department of Astronomy, University of Michigan, Ann Arbor, MI 48109-1090 , , .), AF(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210; , , , , , .), AG(School of Physics and Astronomy, University of St. Andrews, Fife KY16 9SS, Scotland, UK; , .), AH(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210; , , , , , .; Current address: Physics and Astronomy Department, 3270 Biomedical Physical Sciences Building, Michigan State University, East Lansing, MI 48824; .), AI(Institute of Astronomy, School of Science, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan; , .), AJ(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210; , , , , , .; Current address: National Research Council Canada, Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada; .), AK(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210; , , , , , .), AL(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210; , , , , , .), AM(Crimean Astrophysical Observatory, p/o Nauchny, 98409 Crimea, Ukraine; , .; Isaak Newton Institute of Chile, Crimean Branch, Ukraine.), AN(Department of Astronomy, University of Michigan, Ann Arbor, MI 48109-1090 , , .), AO(Crimean Astrophysical Observatory, p/o Nauchny, 98409 Crimea, Ukraine; , .; Isaak Newton Institute of Chile, Crimean Branch, Ukraine.), AP(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721; .), AQ(Department of Astronomy, University of Michigan, Ann Arbor, MI 48109-1090 , , .), AR(Institute of Astronomy, School of Science, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan; , .; Research Center for the Early Universe, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.)
Publication:
The Astrophysical Journal, Volume 651, Issue 2, pp. 775-781. (ApJ Homepage)
Publication Date:
11/2006
Origin:
UCP
ApJ Keywords:
Galaxies: Active, Galaxies: Nuclei, Galaxies: Seyfert
DOI:
10.1086/507417
Bibliographic Code:
2006ApJ...651..775B

Abstract

We have undertaken a new ground-based monitoring campaign to improve the estimates of the mass of the central black hole in NGC 4151. We measure the lag time of the broad Hβ line response compared to the optical continuum at 5100 Å and find a lag of 6.6+1.1-0.8 days. We combine our data with the recent reanalysis of UV emission lines by Metzroth and coworkers to calculate a weighted mean of the black hole mass, MBH=(4.57+0.57-0.47)×107 Msolar. The absolute calibration of the black hole mass is based on normalization of the AGN black hole mass-stellar velocity dispersion (MBH-σ*) relationship to that of quiescent galaxies by Onken and coworkers. The scatter in the MBH-σ* relationship suggests that reverberation-mapping-based mass measurements are typically uncertain by a factor of 3-4.
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