arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1107.1085astro-ph.CO
收藏

塞弗特星系Mrk 704中的极端暖吸收体变率

Extreme Warm Absorber variability in the Seyfert Galaxy Mrk 704

Giorgio Matt, Stefano Bianchi, Matteo Guainazzi, Anna Lia Longinotti, Mauro Dadina, Vladimir Karas, Giuseppe Malaguti, Giovanni Miniutti, Pierre Olivier Petrucc… 展开作者

Giorgio Matt, Stefano Bianchi, Matteo Guainazzi, Anna Lia Longinotti, Mauro Dadina, Vladimir Karas, Giuseppe Malaguti, Giovanni Miniutti, Pierre Olivier Petrucci, Enrico Piconcelli, Gabriele Ponti

摘要:

在大约一半的塞弗特星系中,X射线辐射被一种光学上薄的电离介质吸收,这种介质被称为“暖吸收体”,其起源和位置仍然是一个争论的问题。本文的目的是把更多的约束,通过研究其可变性的温吸收体。我们分析了一个Seyfert 1星系Mrk 704的X射线光谱,它被XMM-牛顿观测了两次,间隔三年。光谱与两个区域吸收体很好地拟合,可能仅覆盖部分源。吸收物质的参数-柱密度,电离状态,覆盖因子-在两次观测之间发生了显着变化。对于电离程度更高的吸收体,可能的解释是环面风(源是极性散射源),或者在部分覆盖的情况下,是吸积盘风。电离程度较低的吸收体可能由原子核周围的轨道云组成,类似于已经在其他来源中发现的,最值得注意的是NGC 1365。

英文摘要:

In about half of Seyfert galaxies, the X-ray emission is absorbed by an optically thin, ionized medium, the so-called "Warm Absorber", whose origin and location is still a matter of debate. The aims of this paper is to put more constraints on the warm absorber by studying its variability. We analyzed the X-ray spectra of a Seyfert 1 galaxy, Mrk 704, which was observed twice, three years apart, by XMM-Newton. The spectra were well fitted with a two zones absorber, possibly covering only partially the source. The parameters of the absorbing matter - column density, ionization state, covering factor - changed significantly between the two observations. Possible explanations for the more ionized absorber are a torus wind (the source is a polar scattering one) or, in the partial covering scenario, an accretion disk wind. The less ionized absorber may be composed of orbiting clouds in the surroundings of the nucleus, similarly to what already found in other sources, most notably NGC 1365.

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。

↑