Evidence for relativistic outflows in narrow-line Seyfert 1 galaxies

被引:50
|
作者
Leighly, KM
Mushotzky, RF
Nandra, K
Forster, K
机构
[1] GODDARD SPACE FLIGHT CTR, GREENBELT, MD 20770 USA
[2] COLUMBIA UNIV, DEPT ASTRON, NEW YORK, NY 10027 USA
来源
ASTROPHYSICAL JOURNAL | 1997年 / 489卷 / 01期
关键词
galaxies; active; individual; (IRAS; 13224-3809; 1H; 0707-495; PG; 1404+226); X-rays;
D O I
10.1086/310950
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report the observation of features near 1 keV in the ASCA spectra from three narrow-line Seyfert 1 (NLS 1) galaxies. We interpret these as oxygen absorption in a highly relativistic outflow. If interpreted as absorption edges, the implied velocities are 0.2-0.3 c, near the limit predicted by ''line-locking'' radiative acceleration. If instead interpreted as broad absorption lines, the implied velocities are similar to 0.57 c, interestingly near the velocity of particles in the last stable orbit around a Kerr black hole, although a physical interpretation of this is not obvious. The features are reminiscent of the UV absorption lines seen in broad absorption Line quasars (BALQSOs), but with larger velocities, and we note the remarkable similarities in the optical emission line and broadband properties of NLS1s and low-ionization BALQSOs.
引用
收藏
页码:L25 / L28
页数:4
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