The unique rapid variabilities of the iron Kα line profiles in NGC 4151

被引:27
作者
Wang, JX [1 ]
Wang, TG
Zhou, YY
机构
[1] Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Anhui, Peoples R China
[2] Chinese Acad Sci, Natl Astron Observ, Beijing 100080, Peoples R China
[3] Beijing Astrophys Ctr, Beijing 100080, Peoples R China
关键词
black hole physics; galaxies : active; galaxies : individual (NGC 4151); line : profiles; X-rays : galaxies;
D O I
10.1086/319471
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a detailed analysis of iron K alpha line variabilities in NGC 4151 using long ASCA observation data obtained in 1995 May. Despite the relatively small amplitude variations in the continuum flux, the iron K alpha line flux and profile show dramatic variations. Particularly, the line profile changes from a single peak to what appears to be double peaks and back in timescales of a few times 10(4) s. The apparently double-peaked profiles can be well interpreted as line emission from a Keplerian ring around a massive black hole. An absorption line at around 5.9 keV is also marginally detected. We discuss current Fe K line models, but none of them can well explain the observed line and continuum variations.
引用
收藏
页码:891 / 895
页数:5
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