天体物理学报(英文版)
天體物理學報(英文版)
천체물이학보(영문판)
ACTA ASTROPHYSICA SINICA
2003年
5期
423-430
,共8页
black hole physics - galaxy: active - galaxy: Seyfert - X-ray: galaxy
We report the discovery of five Narrow-Line Seyfert 1 galaxies (NLS1s)identified from the ROSAT All-Sky Survey bright sources. One of them has a quasarlike luminosity and two, including the quasar-like one, have close companions and/or show interacting features. We calculate the central black hole masses and Eddington ratios for the five NLSls. In combination with the objects of Kaspi et al., we find that NLSls have smaller central black hole masses and higher accretion rate than normal Seyfert 1s.
