Rapidly variable FeKα line in NGC 4051

被引：21
作者：
Wang, JX [1 ]
Zhou, YY
Xu, HG
Wang, TG
机构：
[1] Univ Sci & Technol China, Ctr Astrophys, Anhua 230026, Peoples R China
[2] Beijing Astrophys Ctr, Beijing 100080, Peoples R China
[3] Chinese Acad Sci, Lab Cosm Ray & High Energy Astrophys, Beijing, Peoples R China
[4] Shanghai Jiao Tong Univ, Dept Phys, Inst Space Astrophys, Shanghai 200030, Peoples R China
[5] RIKEN, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan
来源：
ASTROPHYSICAL JOURNAL | 1999年 / 516卷 / 02期
关键词：
galaxies : individual (NGC 4051); galaxies : Seyfert; X-rays : galaxies;
D O I：
10.1086/312004
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present a detailed analysis on the variability of the Fe K emission line in NGC 4051 using ASCA data. Through simple Gaussian line fits, we find not only obvious Fe K line variability with no significant difference in the X-ray continuum flux between two ASCA observations that were separated by similar to 440 days, but also rapid variability of the Fe K line on timescales similar to 10(4) s within the second observation. During the second observation, the line is strong (EW = 733(-219)(+206) eV) and broad (sigma = 0.96(-0.35)(+0.49) keV) when the source is brightest and becomes weaker (EW = 165(-86)(+87) eV) and narrower (sigma < 0.09 keV) while the source is weakest. The equivalent width of the Fe K line correlates positively with the continuum flux, which shows an opposite trend with another Seyfert type 1 galaxy, MCG -6-30-15.
引用
收藏
页码：L65 / L68
页数：4
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