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arXiv 1601.01971astro-ph.GAastro-ph.CO
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在z > 3的CO发射体中搜索HI和OH吸收

A search for HI and OH absorption in z > 3 CO emitters

S. J. Curran, J. R. Allison, M. T. Whiting, E. M. Sadler, F. Combes, M. B. Pracy, C. Bignell, R. Athreya

摘要:

我们提出了一个调查的结果HI 21-cm和OH 18-cm吸收在7个强CO发射器在z > 3。尽管达到的限制相比,所需的检测21厘米吸收在较低的红移,我们没有检测到任何过渡搜索的对象。我们认为这是由于高红移选择导致我们所有的目标都具有超过临界值的紫外线光度,其中宿主星系盘中的所有原子气体都被怀疑电离。然而,不仅是我们所有的目标明亮的CO排放,但检测CO以上的临界紫外光度一般并不罕见。这表明,分子气体被屏蔽的辐射或物理上远离连续辐射的来源,因为它似乎是从CO观测高红移射电星系。

英文摘要:

We present the results of a survey for HI 21-cm and OH 18-cm absorption in seven strong CO emitters at z > 3. Despite reaching limits comparable to those required to detect 21-cm absorption at lower redshifts, we do not detect either transition in any of the objects searched. We believe that this is due to the high redshift selection causing all of our targets to have ultra-violet luminosities above the critical value, where all of the atomic gas in the host galaxy disk is suspected to be ionised. However, not only are all of our targets bright in CO emission, but detection of CO above the critical UV luminosity is generally not uncommon. This suggests that the molecular gas is shielded from the radiation or is physically remote from the source of the continuum emission, as it appears to be from CO observations of high redshift radio galaxies.

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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