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NGC 5548 in a Low-Luminosity State

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Authors:
  • Bentz, Misty C. ;
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    unknown
  • Denney, Kelly D. ;
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    Dark Cosmology Centre, Niels Bohr Institute, Faculty of Science, Københavns Universitet
  • Cackett, Edward M. ;
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    unknown
  • Dietrich, Matthias ;
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    unknown
  • Fogel, Jeffrey K. J. ;
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    unknown
  • Ghosh, Himel ;
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    unknown
  • Horne, Keith D. ;
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    unknown
  • Kuehn, Charles ;
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    unknown
  • Minezaki, Takeo ;
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    unknown
  • Onken, Christopher A. ;
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    unknown
  • Peterson, Bradley M. ;
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    unknown
  • Pogge, Richard W. ;
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    unknown
  • Pronik, Vladimir I. ;
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    unknown
  • Richstone, Douglas O. ;
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    unknown
  • Sergeev, Sergey G. ;
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    unknown
  • Vestergaard, Marianne ;
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    Orcid logo0000-0001-9191-9837
    Dark Cosmology Centre, Niels Bohr Institute, Faculty of Science, Københavns Universitet
  • Walker, Matthew G. ;
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    unknown
  • Yoshii, Yuzuru
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    unknown
Subtitle:
Implications for the Broad-Line Region
DOI:
10.1086/516724
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 L(5100) = 4.7 x 10^42 ergs s^-1. We determine a rest-frame time lag between flux variations in the continuum and the Hbeta 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 M_BH = 6.54 (+0.26/-0.25) x 10^7 M_sun 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 alpha = 0.5, the naive expectation for the broad line region for an assumed form of r ~ L^alpha. This value is also consistent with the slope recently determined by Bentz et al. for the population of reverberation-mapped AGNs as a whole.
Type:
Journal article
Language:
English
Published in:
Astrophysical Journal, 2007, Vol 662, Issue 1
Keywords:
astro-ph
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2007
Scientific Level:
Scientific
ID:
231992344

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