부산대학교 도서관

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 H β (∼3%). The H β time lag relative to the continuum has been found from the cross-correlation function centroid to be τ cent = 112 days. This result and the H β 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. [ABSTRACT FROM AUTHOR]