IUE SPECTRA OF THE SEYFERT 1 GALAXIES Mrk 335 and NGC 4051

Abstract

The international ultraviolet explorer (IUE) spectra of a low dispersion $\~6{\AA}$ 수식 이미지, have been investigated for two Seyfert 1 galaxies, Mrk 335 and NGC 4051, well known for the line variability. The electron densities of broad line region (BLR) of these variable Seyfert 1 galaxies have been derived, which showed a non-linear abrupt variation from $10^8$ 수식 이미지 to $10^{10} cm-3$ 수식 이미지 within a month. We also found the excitation (or temperature) changes in the Mrk 335 BLR from the IUE broad line profiles analysis, but no such evidence in the NGC 4051. The large amount of mass inflow activity through the bar or spiral structure of host galaxies, may trigger the density change in BLR and emission line variability for both objects. Mass of the giant black holes appear to be order of $10^7\;M_{\bigodot}$ 수식 이미지 for both variable Seyfert l's.