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arXiv 1004.0690astro-ph.CO
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康普顿厚活动星系核的演化和爱丁顿比分布

The Evolution and Eddington Ratio Distribution of Compton Thick Active Galactic Nuclei

A. R. Draper, D. R. Ballantyne

摘要:

以往关于活动星系核(AGN)对宇宙X射线背景(CXB)贡献的研究只考虑了光度和吸收柱等可观测参数。在这里,我们第一次将CXB的研究扩展到包括源的爱丁顿比和黑洞质量在内的物理参数。为了计算不同爱丁顿比下活动星系核吸积对CXB的贡献,计算了一个演化的爱丁顿比空间密度模型。特别是,康普顿厚(CT)活动星系核被模拟为在特定的,物理驱动的爱丁顿比吸积,而不是作为一个简单的扩展康普顿薄2型活动星系核人口。与观测到的CT AGN空间密度和logN-logS关系的比较表明,CT AGN很可能是由以大于90%或小于1%的爱丁顿速率吸积的源组成的AGN的复合粒子群。

英文摘要:

Previous studies of the active galactic nuclei (AGN) contribution to the cosmic X-ray background (CXB) consider only observable parameters such as luminosity and absorbing column. Here, for the first time, we extend the study of the CXB to physical parameters including the Eddington ratio of the sources and the black hole mass. In order to calculate the contribution to the CXB of AGN accreting at various Eddington ratios, an evolving Eddington ratio space density model is calculated. In particular, Compton thick (CT) AGN are modeled as accreting at specific, physically motivated Eddington ratios instead of as a simple extension of the Compton thin type 2 AGN population. Comparing against the observed CT AGN space densities and log N-log S relation indicates that CT AGN are likely a composite population of AGN made up of sources accreting either at >90% or <1% of their Eddington rate.

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