arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0706.1885astro-ph
收藏

吸积盘风对AGN X射线谱的影响：第一部分-- XSCORT

The impact of accretion disk winds on the X-ray spectrum of AGN: Part 1 - XSCORT

N. J. Schurch, C. Done

备注：
14 pages, 9 figures (colour), Accepted for publication in MNRAS (13th Aug 2007). Several significant changes to the text from v1
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

活动星系核中的吸积盘预计将产生强烈的外流，特别是紫外线驱动的风。尽管提供了一个很好的适合的数据，目前的光谱模型的X射线光谱观测活动星系核通过一个吸积盘风是特设的风材料的属性的治疗。为了解决这些局限性，我们采用了一种数值计算方法，该方法将一系列的辐射转移计算联系起来，并以自洽的方式（XSCORT）将全球速度场的影响纳入其中。我们提出了一系列的例子光谱的XSCORT代码，使我们能够检查的形状AGN X射线光谱看到通过风，速度和密度分布的范围内，总柱密度和初始电离参数。这些详细的光谱模型清楚地显示了相当大的复杂性和结构，强烈影响所有这些因素。在XSCORT光谱中存在的尖锐特征与以前的模型和观测到的活动星系核的软X射线过剩的X射线光谱的平滑性质形成强烈对比，表明吸积盘风不太可能是这种神秘的光谱特征的起源。影响模型中尖锐特征存在的最重要参数是风的终极速度。将吸收材料的终极速度增加到~c，从而显著增加风中的速度分散，可能会消除这些特征，从而产生类似于先前模型的频谱。这种快速移动的外流不可能与辐射驱动的吸积盘风有关，然而，高度相对论性喷流的存在可能为这种物质提供了一个来源。

英文摘要：

(abridged) The accretion disk in AGN is expected to produce strong outflows, in particular a UV-line driven wind. Despite providing a good fit to the data, current spectral models of the X-ray spectrum of AGN observed through an accretion disk wind are ad-hoc in their treatment of the properties of the wind material. In order to address these limitations we adopt a numerical computation method that links a series of radiative transfer calculations, incorporating the effect of a global velocity field in a self-consistent manner (XSCORT). We present a series of example spectra from the XSCORT code that allow us to examine the shape of AGN X-ray spectra seen through a wind, for a range of velocity and density distributions, total column densities and initial ionization parameters. These detailed spectral models clearly show considerable complexity and structure that is strongly affected by all these factors. The presence of sharp features in the XSCORT spectra contrasts strongly with both the previous models and with the smooth nature of the observed X-ray spectra of AGN with soft X-ray excesses, demonstrating that accretion disk winds are unlikely to be the origin of this mysterious spectral feature. The most significant parameter affecting the presence of the sharp features in the models is the terminal velocity of the wind. Increasing the terminal velocity of the absorbing material to ~c, and hence dramatically increasing the velocity dispersion across the wind, could potentially remove these features resulting in a spectrum similar to the previous models. Such a fast moving outflow cannot be associated with a radiatively driven accretion disk wind, however the presence of a highly relativistic jet may provide an origin for such material.

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。

↑