Optical variability of the active galactic nucleus 1E 0754.6+3928 and reverberation-based mass estimate for the central black hole
Abstract
We analyze the spectroscopic and photometric observations of the active galactic nucleus (AGN) 1E 0754.6+3928 performed at Crimean Astrophysical Observatory in 1998-2004. Based on formal spectroscopic criteria for the optical wavelength range, we can classify this object as a narrow-line Seyfert 1 (NLS1) galaxy. Over the period of its observations, the AGN 1E 0754.6+3928 showed a very low rms flux variability amplitude in both continuum and Hβ (∼3%). The Hβ time lag relative to the continuum has been found from the cross-correlation function centroid to be τcent = 112−67+215 days. This result and the Hβ line dispersion estimate have allowed us to determine the central black hole mass by the reverberation method: 1.05 × 108M⊙. The position of 1E 0754.6+3928 in the black hole mass-luminosity diagram agrees with the positions of other NLS1 galaxies and can be explained by an enhanced mass accretion rate in the central source.
- Publication:
-
Astronomy Letters
- Pub Date:
- July 2007
- DOI:
- 10.1134/S1063773707070018
- Bibcode:
- 2007AstL...33..429S
- Keywords:
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- galactic nuclei;
- black holes