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Title:
NGC 5548 in a Low-Luminosity State: Implications for the Broad-Line Region
Authors:
Bentz, Misty C.; Denney, Kelly D.; Cackett, Edward M.; Dietrich, Matthias; Fogel, Jeffrey K. J.; Ghosh, Himel; Horne, Keith D.; 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, Columbus, OH 43210; , , , , , .), AB(Department of Astronomy, The Ohio State University, Columbus, OH 43210; , , , , , .), AC(School of Physics and Astronomy, University of St. Andrews, Fife, KY16 9SS, Scotland, UK; , .; Department of Astronomy, University of Michigan, Ann Arbor, MI 48109-1090 , , .), AD(Department of Astronomy, The Ohio State University, Columbus, OH 43210; , , , , , .), AE(Department of Astronomy, University of Michigan, Ann Arbor, MI 48109-1090 , , .), AF(Department of Astronomy, The Ohio State University, 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, Columbus, OH 43210; , , , , , .; Current address: Physics and Astronomy Department, 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, 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, Columbus, OH 43210; , , , , , .), AL(Department of Astronomy, The Ohio State University, 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, 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 662, Issue 1, pp. 205-212. (ApJ Homepage)
Publication Date:
06/2007
Origin:
UCP
ApJ Keywords:
Galaxies: Active, Galaxies: Nuclei, Galaxies: Seyfert
DOI:
10.1086/516724
Bibliographic Code:
2007ApJ...662..205B

Abstract

We describe results from a new ground-based monitoring campaign on NGC 5548, the best-studied reverberation-mapped AGN. We find that it was in the lowest luminosity state yet recorded during a monitoring program, namely L5100=4.7×1042 ergs s-1. We determine a rest-frame time lag between flux variations in the continuum and the Hβ line of 6.3+2.6-2.3 days. Combining our measurements with those of previous campaigns, we determine a weighted black hole mass of MBH=6.54+0.26-0.25×107 Msolar based on all broad emission lines with suitable variability data. We confirm the previously discovered virial relationship between the time lag of emission lines relative to the continuum and the width of the emission lines in NGC 5548, which is the expected signature of a gravity-dominated broad-line region. Using this lowest luminosity state, we extend the range of the relationship between the luminosity and the time lag in NGC 5548 and measure a slope that is consistent with α=0.5, the naive expectation for the broad-line region for an assumed form of r~Lα. This value is also consistent with the slope recently determined by Bentz et al. for the population of reverberation-mapped AGNs as a whole.
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