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arXiv 1202.0780astro-ph.HEastro-ph.CO
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塞弗特星系NGC 4051 - III的扩展XMM-牛顿观测。FeK发射和吸收

An extended XMM-Newton observation of the Seyfert galaxy NGC 4051 - III. FeK emission and absorption

K. A. Pounds, S. Vaughan

摘要:

2009年,对塞弗特1星系NGC 4051进行了扩展的XMM-牛顿观测,发现了一种具有复杂吸收线速度结构的光电离外流,以及速度与电离参数的广泛相关性,Pounds等人(2011)表示,这与进入星际介质或先前喷出物的高度电离的高速风一致,在由此产生的强烈冲击中失去了大部分的动能。在本文中,我们更详细地研究了Fe K谱区,并发现在高度电离的吸收体中支持两个不同的速度分量,其值对应于假定的快风(~ 0.12c)和激波后流(v ~ 5000-7000 km/s)。铁K吸收线结构被认为是不同的轨道到轨道的时间尺度上,显然响应于电离通量的短期增加和-也许更普遍的-在软X射线(和同时紫外线)光度的变化。后一个结果是特别有趣的,在提供独立的支持存在的冲击气体冷却主要是由康普顿散射吸积盘光子。铁钾发射是由一个窄的荧光线从近中性物质,与弱红翼在这里模拟的相对论盘线。窄线通量是准恒定的整个45天的2009年活动,但解决,与散射的冲击后流的一个组成部分的速度宽度一致。在几个单独的轨道光谱中的Fe XXV和Fe XXVI的共振跃迁的P天鹅座配置文件的证据。

英文摘要:

An extended XMM-Newton observation of the Seyfert 1 galaxy NGC 4051 in 2009 detected a photo-ionized outflow with a complex absorption line velocity structure and a broad correlation of velocity with ionization parameter, shown in Pounds et al (2011) to be consistent with a highly ionized, high velocity wind running into the interstellar medium or previous ejecta, losing much of its kinetic energy in the resultant strong shock. In the present paper we examine the Fe K spectral region in more detail and find support for two distinct velocity components in the highly ionized absorber, with values corresponding to the putative fast wind (~ 0.12c) and the post-shock flow (v ~ 5000-7000 km/s). The Fe K absorption line structure is seen to vary on a orbit-to-orbit timescale, apparently responding to both a short term increase in ionizing flux and - perhaps more generally - to changes in the soft X-ray (and simultaneous UV) luminosity. The latter result is particularly interesting in providing independent support for the existence of shocked gas being cooled primarily by Compton scattering of accretion disc photons. The Fe K emission is represented by a narrow fluorescent line from near-neutral matter, with a weak red wing modelled here by a relativistic diskline. The narrow line flux is quasi-constant throughout the 45-day 2009 campaign, but is resolved, with a velocity width consistent with scattering from a component of the post-shock flow. Evidence for a P Cygni profile is seen in several individual orbit spectra for resonance transitions in both Fe XXV and Fe XXVI.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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