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arXiv 0810.3917astro-ph
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扩展Chandra深场南X射线源的光谱学

Optical Spectroscopy of X-ray sources in the Extended Chandra Deep Field South

E. Treister, S. Virani, E. Gawiser, C. M. Urry, P. Lira, H. Francke, G. A. Blanc, C. N. Cardamone, M. Damen, E. N. Taylor, K. Schawinski

摘要:

我们目前的第一个结果,我们的光谱计划,旨在提供红移和鉴定的X射线源在扩展钱德拉深场南。使用麦哲伦望远镜的IMACS摄谱仪和甚大望远镜的VIMOS摄谱仪,共瞄准了339个源。我们测量了186个X射线源的红移,包括档案数据和文献检索。我们发现活动星系核的宿主星系的平均静止框架光学颜色比非活动星系红,并且它们主要生活在“绿谷”中。被遮蔽的活动星系核的光度和红移的分数的依赖关系被确认在高的意义和观测到的活动星系核的空间密度进行比较,从现有的光度函数的预期。这些活动星系核在中红外线与X射线通量的比值上表现出明显的差异,这可以用尘埃自吸收对前者的影响来解释。这种差异在低光度的源中更大,这与尘埃张开角依赖于活动星系核光度的情况是一致的。

英文摘要:

We present the first results of our optical spectroscopy program aimed to provide redshifts and identifications for the X-ray sources in the Extended Chandra Deep Field South. A total of 339 sources were targeted using the IMACS spectrograph at the Magellan telescopes and the VIMOS spectrograph at the VLT. We measured redshifts for 186 X-ray sources, including archival data and a literature search. We find that the AGN host galaxies have on average redder rest-frame optical colors than non-active galaxies, and that they live mostly in the "green valley". The dependence of the fraction of AGN that are obscured on both luminosity and redshift is confirmed at high significance and the observed AGN space density is compared with the expectations from existing luminosity functions. These AGN show a significant difference in the mid-IR to X-ray flux ratio for obscured and unobscured AGN, which can be explained by the effects of dust self-absorption on the former. This difference is larger for lower luminosity sources, which is consistent with the dust opening angle depending on AGN luminosity.

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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