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Title:
A Revised Broad-line Region Radius and Black Hole Mass for the Narrow-line Seyfert 1 NGC 4051
Authors:
Denney, K. D.; Watson, L. C.; Peterson, B. M.; Pogge, R. W.; Atlee, D. W.; Bentz, M. C.; Bird, J. C.; Brokofsky, D. J.; Comins, M. L.; Dietrich, M.; Doroshenko, V. T.; Eastman, J. D.; Efimov, Y. S.; Gaskell, C. M.; Hedrick, C. H.; Klimanov, S. A.; Klimek, E. S.; Kruse, A. K.; Lamb, J. B.; Leighly, K.; Minezaki, T.; Nazarov, S. V.; Petersen, E. A.; Peterson, P.; Poindexter, S.; Schlesinger, Y.; Sakata, K. J.; Sergeev, S. G.; Tobin, J. J.; Unterborn, C.; Vestergaard, M.; Watkins, A. E.; Yoshii, Y.
Affiliation:
AA(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ), AB(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ), AC(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ; Center for Cosmology and AstroParticle Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, OH 43210, USA ; ), AD(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ; Center for Cosmology and AstroParticle Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, OH 43210, USA ; ), AE(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ), AF(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ; Present address: Department of Physics and Astronomy, 4129 Frederick Reines Hall, University of California at Irvine, Irvine, CA 92697-4575, USA; . ; ), AG(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ), AH(Department of Physics & Astronomy, University of Nebraska, Lincoln, NE 68588-0111, USA ; Deceased 2008 September 13. ; ), AI(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ; Present address: Astronomy and Astrophysics Department, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USA. ; ), AJ(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ), AK(Crimean Laboratory of the Sternberg Astronomical Institute, p/o Nauchny, 98409 Crimea, Ukraine ; Crimean Astrophysical Observatory, p/o Nauchny, 98409 Crimea, Ukraine ; Isaak Newton Institute of Chile, Crimean Branch, Ukraine ; ), AL(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ), AM(Crimean Astrophysical Observatory, p/o Nauchny, 98409 Crimea, Ukraine ), AN(Department of Physics & Astronomy, University of Nebraska, Lincoln, NE 68588-0111, USA ; Present address: Astronomy Department, University of Texas, Austin, TX 78712-0259, USA; . ; ), AO(Department of Physics & Astronomy, University of Nebraska, Lincoln, NE 68588-0111, USA ; Present address: Astronomy and Astrophysics Department, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USA. ), AP(Crimean Astrophysical Observatory, p/o Nauchny, 98409 Crimea, Ukraine ; Isaak Newton Institute of Chile, Crimean Branch, Ukraine ), AQ(Department of Physics & Astronomy, University of Nebraska, Lincoln, NE 68588-0111, USA ; Present address: Astronomy Department, MSC 4500, New Mexico State University, P.O. Box 30001, La Cruces, NM 88003-8001, USA. ), AR(Department of Physics & Astronomy, University of Nebraska, Lincoln, NE 68588-0111, USA ), AS(Department of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109-1040, USA ), AT(Homer L. Dodge Department of Physics and Astronomy, The University of Oklahoma, 440 W. Brooks Street, Norman, OK 73019, USA ), AU(Institute of Astronomy, School of Science, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan ), AV(Crimean Astrophysical Observatory, p/o Nauchny, 98409 Crimea, Ukraine ; Isaak Newton Institute of Chile, Crimean Branch, Ukraine ), AW(Department of Physics & Astronomy, University of Nebraska, Lincoln, NE 68588-0111, USA ), AX(Department of Physics and Astronomy, Ohio University, Athens, OH 45701-2979, USA ), AY(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ), AZ(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ), BA(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ), BB(Crimean Laboratory of the Sternberg Astronomical Institute, p/o Nauchny, 98409 Crimea, Ukraine ; Isaak Newton Institute of Chile, Crimean Branch, Ukraine ), BC(Department of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109-1040, USA ), BD(Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ), BE(Steward Observatory, The University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA ; Present address: Department of Physics and Astronomy, Tufts University, Medford, MA 02155, USA.), BF(Department of Physics & Astronomy, University of Nebraska, Lincoln, NE 68588-0111, USA ), BG(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 702, Issue 2, pp. 1353-1366 (2009). (ApJ Homepage)
Publication Date:
09/2009
Origin:
IOP
ApJ Keywords:
galaxies: active, galaxies: nuclei, galaxies: Seyfert
DOI:
10.1088/0004-637X/702/2/1353
Bibliographic Code:
2009ApJ...702.1353D

Abstract

We present the first results from a high sampling rate, multimonth reverberation mapping campaign undertaken primarily at MDM Observatory with supporting observations from telescopes around the world. The primary goal of this campaign was to obtain either new or improved Hβ reverberation lag measurements for several relatively low luminosity active galactic nuclei (AGNs). We feature results for NGC 4051 here because, until now, this object has been a significant outlier from AGN scaling relationships, e.g., it was previously a ~2-3σ outlier on the relationship between the broad-line region (BLR) radius and the optical continuum luminosity—the R BLR-L relationship. Our new measurements of the lag time between variations in the continuum and Hβ emission line made from spectroscopic monitoring of NGC 4051 lead to a measured BLR radius of R BLR = 1.87+0.54 -0.50 light days and black hole mass of M BH = (1.73+0.55 -0.52) × 106 M sun. This radius is consistent with that expected from the R BLR-L relationship, based on the present luminosity of NGC 4051 and the most current calibration of the relation by Bentz et al.. We also present a preliminary look at velocity-resolved Hβ light curves and time delay measurements, although we are unable to reconstruct an unambiguous velocity-resolved reverberation signal.
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