Optical variability of the active galactic nucleus 1E 0754.6+3928 and reverberation-based mass estimate for the central black hole |
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| Authors: | S G Sergeev S A Klimanov N G Chesnok V I Pronik |
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| Institution: | (1) Crimean Astrophysical Observatory, Ukrainian Academy of Sciences, p/o Nauchnyi, Crimea, 98409, Ukraine;(2) Astronomical Observatory, Taras Shevchenko Kiev National University, pr. Akademika Glushkova 2, Kiev, 03680, Ukraine |
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| 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 τ cent = 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 × 108 M ⊙. 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. |
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| Keywords: | galactic nuclei black holes |
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