Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
권호 표지

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

  • HYUNG SIEK (Korea Astronomy Observatory) ;
  • KIM HYOUK (Korea Astronomy Observatory) ;
  • LEE Woo BAlK (Korea Astronomy Observatory) ;
  • LEE SEONG-JAE (Dept. of Astronomy and Space Sci, Chungnam National University) ;
  • RYU DONGSU (Dept. of Astronomy and Space Sci, Chungnam National University) ;
  • LEE HEE-WON (Dept. of Astronomy and Space Sci, Yonsei University)
  • Published : 2000.10.01
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Abstract

The international ultraviolet explorer (IUE) spectra of a low dispersion $\~6{\AA}$, 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 $10^8$ to $10^{10} cm-3$ 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 $10^7\;M_{\bigodot}$ for both variable Seyfert l's.

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