MULTIWAVELENGTH MONITORING OF THE DWARF SEYFERT 1 GALAXY NGC 4395. I. A REVERBERATION-BASED MEASUREMENT OF THE BLACK HOLE MASS

@article{Peterson2005MULTIWAVELENGTHMO,
  title={MULTIWAVELENGTH MONITORING OF THE DWARF SEYFERT 1 GALAXY NGC 4395. I. A REVERBERATION-BASED MEASUREMENT OF THE BLACK HOLE MASS},
  author={Bradley M. Peterson and Misty C. Bentz and Louis Desroches and Alexei V. Filippenko and Luis C. Ho and Shai Kaspi and Ari Laor and Dan Maoz and Edward C. Moran and Richard W. Pogge and Alice C. Quillen},
  journal={The Astrophysical Journal},
  year={2005},
  volume={632},
  pages={799-808}
}
A reverberation-mapping program on NGC 4395, the least luminous known Seyfert 1 galaxy, undertaken with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope yields a measurement of the mass of the central black hole MBH = (3.6 ± 1.1) × 105 M☉. The observations consist of two visits of five orbits each, in 2004 April and July. During each of these visits, the UV continuum varied by at least 10% (rms), and only C IV λ1549 showed corresponding variations large enough to reliably… Expand
Multiwavelength Monitoring of the Dwarf Seyfert 1 Galaxy NGC 4395. III. Optical Variability and X-Ray/UV/Optical Correlations
We present optical observations of the low-luminosity Seyfert 1 nucleus of NGC 4395, as part of a multiwavelength reverberation-mapping program. Observations were carried out over two nights in 2004Expand
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We have recently completed a 64-night spectroscopic monitoring campaign at the Lick Observatory 3-m Shane telescope with the aim of measuring the masses of the black holes in 12 nearby (z < 0: 05)Expand
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We report on two Chandra observations, and a simultaneous Hubble Space Telescope ultraviolet observation, of the dwarf Seyfert 1 galaxy NGC 4395. Each Chandra observation had a duration of ~30 ks,Expand
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Multiwavelength Monitoring of the Dwarf Seyfert 1 Galaxy NGC 4395. IV. The Variable UV Absorption Lines
We report the detection of variable UV absorption lines in NGC 4395, based on UV observations with the HST STIS carried out in 2004 April and July as part of a reverberation-mapping campaign.Expand
The Suzaku broadband X-ray spectrum of the dwarf Seyfert galaxy NGC 4395
We present a Suzaku observation of the dwarf Seyfert galaxy NGC 4395 with an estimated black hole mass of ~10 5 M ⊙ . Rapid and strong X-ray variability with an rms amplitude of ~60 per cent isExpand
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NGC 4395 is a bulgeless spiral galaxy, harboring one of the nearest known type 1 Seyfert nuclei. Although there is no consensus on the mass of its central engine, several estimates suggest it to beExpand
Hα Reverberation Mapping of the Intermediate-mass Active Galactic Nucleus in NGC 4395
  • Hojin Cho, J. Woo, +24 authors V. U
  • Physics
  • The Astrophysical Journal
  • 2021
We present the results of a high-cadence spectroscopic and imaging monitoring campaign of the active galactic nucleus (AGN) of NGC 4395. High signal-to-noise-ratio spectra were obtained at theExpand
The lick AGN monitoring project: photometric light curves and optical variability characteristics
The Lick AGN Monitoring Project targeted 13 nearby Seyfert 1 galaxies with the intent of measuring the masses of their central black holes using reverberation mapping. The sample includes 12 galaxiesExpand
The effects of X-ray absorption variability in NGC 4395
We present a new X-ray analysis of the dwarf Seyfert galaxy NGC 4395, based on two archival XMM–Newton and Suzaku observations. This source is well known for a series of remarkable properties: one ofExpand
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We present optical spectroscopic observations of the least-luminous known Seyfert 1 galaxy, NGC 4395, which was monitored every half-hour over the course of three nights. The continuum emissionExpand
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We have used the Hubble Space Telescope to obtain ultraviolet spectra and optical images of the nucleus of NGC 4395, the least luminous and nearest known type 1 Seyfert. The spectrum closelyExpand
Steps toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. IX. Ultraviolet Observations of Fairall 9
An 8 month monitoring campaign on the Seyfert 1 galaxy Fairall 9 has been conducted with the International Ultraviolet Explorer in an attempt to obtain reliable estimates of continuum-continuum andExpand
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We have used the Very Large Array (VLA) to conduct a survey for radio continuum emission in the sample of 52 Seyfert nuclei selected from the optical spectroscopic galaxy catalog of Ho, Filippenko, &Expand
Evidence for an intermediate-mass black hole and a multi-zone warm absorber in NGC 4395
We report on the results of an analysis in the X-ray band of a recent long ASCA observation of NGC 4395, the most variable low-luminosity active galactic nucleus known. A relativistically broadenedExpand
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