Tracing a disk wind in NGC 3516

被引:79
作者
Turner, T. J. [1 ,2 ]
Reeves, J. N. [3 ]
Kraemer, S. B. [4 ]
Miller, L. [5 ]
机构
[1] Univ Maryland Baltimore Cty, Dept Phys, Baltimore, MD 21250 USA
[2] NASA, Goddard Space Flight Ctr, Explorat Universe Div, Greenbelt, MD 20771 USA
[3] Univ Keele, Sch Phys & Geog Sci, Astrophys Grp, Keele ST5 5BG, Staffs, England
[4] Catholic Univ Amer, Dept Phys, Washington, DC 20064 USA
[5] Univ Oxford, Dept Phys, Oxford OX1 3RH, England
基金
英国科学技术设施理事会;
关键词
X-rays : galaxies; black hole physics; galaxies : Seyfert;
D O I
10.1051/0004-6361:20078808
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Context. X-ray spectra of AGN often contain signatures indicative of absorption in multiple layers of gas whose ionization-state and covering fraction may vary with time. It has been unclear to date how much of the observed X-ray spectral and timing behavior in AGN can be attributed to variations in absorption, versus variations in the strengths of emission or reflection components. Diagnostics of the inner regions of AGN cannot be reliably performed until the origin of observed effects is understood. Aims. We investigate the role of the X-ray absorbers in the Seyfert 1 galaxy NGC 3516. Methods. Time-averaged and flux-selected spectroscopy is used to examine the behavior of NGC 3516 observed in Chandra HETG and XMM data from Oct. 2006. Results. New H-like and He-like emission and absorption features discovered in the Fe K regime reveal a previously unknown zone of circumnuclear gas in NGC 3516 with log xi similar to 4.3 and column density similar to 10(23) cm(-2). A lower-ionization layer with log xi similar to 2 and of similar column density is confirmed from previous observations, this layer has a covering fraction around 50%, and changes in covering provide a simple explanation of a deep dip in the light curve that we interpret as an eclipse of the continuum due to passage of a cloud across the sight line within half a day. These inner zones of absorbing gas are detected to have outflow velocities in the range 1000-2000 km s(-1), this, and constraints on radial location are consistent with an origin as part of a disk wind in NGC 3516.
引用
收藏
页码:161 / 169
页数:9
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