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arXiv 1008.1502astro-ph.HEastro-ph.CO
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Seyfert 2星系NGC 7590的XMM观测:X射线吸收的性质

XMM Observations of the Seyfert 2 Galaxy NGC 7590: the Nature of X-ray Absorption

X. W. Shu, T. Liu, J. X. Wang

摘要:

本文分析了塞弗特2星系NGC 7590的三个XMM观测结果。在低空间分辨率ASCA数据中发现源没有X射线吸收。XMM观测提供了比以前ASCA数据高10倍的空间分辨率。我们发现NGC 7590的X射线辐射主要是由非核ULX辐射和来自宿主星系的扩展辐射组成。核X射线发射与宿主星系相比相当弱。基于它非常低的X射线光度以及2-10 keV和[O III]通量之间的小比率,我们将NGC 7590解释为康普顿厚度,而不是一个“未被遮蔽的”塞弗特2星系。未来更高分辨率的观测,如钱德拉,对于揭示NGC 7590核的性质至关重要。

英文摘要:

We present the analysis of three XMM observations of the Seyfert 2 galaxy NGC 7590. The source was found to have no X-ray absorption in the low spatial resolution ASCA data. The XMM observations provide a factor of 10 better spatial resolution than previous ASCA data. We find that the X-ray emission of NGC 7590 is dominated by an off-nuclear ULX and extended emission from the host galaxy. The nuclear X-ray emission is rather weak comparing with the host galaxy. Based on its very low X-ray luminosity as well as the small ratio between the 2-10 keV and the [O III] fluxes, we interpret NGC 7590 as Compton-thick rather than being an "unobscured" Seyfert 2 galaxy. Future higher resolution observations such as Chandra are crucial to shed light on the nature of NGC 7590 nucleus.

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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