Chandra observations of the X-ray narrow-line region in NGC 4151

被引:108
作者
Ogle, PM [1 ]
Marshall, HL [1 ]
Lee, JC [1 ]
Canizares, CR [1 ]
机构
[1] MIT, Ctr Space Res, Cambridge, MA 02139 USA
基金
美国国家航空航天局;
关键词
galaxies : individual (NGC 4151); galaxies : Seyfert; X-rays : galaxies;
D O I
10.1086/317890
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present the first high-resolution X-ray spectrum of the Seyfert 1.5 galaxy NGC 4151. Observations with the Chandra High-Energy Transmission Grating Spectrometer reveal a spectrum dominated by narrow emission lines from a spatially resolved (1.6 kpc), highly ionized nebula. The X-ray narrow-line region is composite, consisting of both photoionized and collisionally ionized components. The X-ray emission lines have similar velocities, widths, and spatial extent to the optical emission lines, showing that they arise in the same region. The clouds in the narrow-line region must contain a large range of ionization states in order to explain both the optical and X-ray photoionized emission. Chandra data give the first direct evidence of X-ray line emission from a hot plasma (T similar to 10(7) K) that may provide pressure confinement for the cooler (T = 3 x 10(4) K) photoionized clouds.
引用
收藏
页码:L81 / L84
页数:4
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