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arXiv 1402.6320astro-ph.GAastro-ph.CO
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Herschel揭示了z = 2.3 ULIRG中的分子外流

Herschel reveals a molecular outflow in a z = 2.3 ULIRG

Richard George, Rob Ivison, Ian Smail, Mark Swinbank, Rosalind Hopwood, Flora Stanley, Bruce Swinyard, Ivan Valtchanov, Paul van der Werf

摘要:

我们报告的结果,从19小时的整合与SPIRE傅立叶变换光谱仪搭载赫歇尔空间天文台,揭示了存在的分子流出的宇宙睫毛(SMM J2135-0102)通过检测蓝移OH吸收。几个精细结构的发射线的检测表明,低激发HII区域的贡献强烈的[CII]在这个z = 2.3 ULIRG的光度。OH特征表明最大风速为700 km/s,低于宿主暗物质晕的预期逃逸速度,约1000 km/s。因此,很大一部分可用的分子气体可以通过由此产生的气体喷泉延长的爆发转化为恒星,直到活动星系核驱动的外流可以喷射出剩余的气体。

英文摘要:

We report the results from a 19-h integration with the SPIRE Fourier Transform Spectrometer aboard the Herschel Space Observatory which has revealed the presence of a molecular outflow from the Cosmic Eyelash (SMM J2135-0102) via the detection of blueshifted OH absorption. Detections of several fine-structure emission lines indicate low-excitation HII regions contribute strongly to the [CII] luminosity in this z = 2.3 ULIRG. The OH feature suggests a maximum wind velocity of 700 km/s, which is lower than the expected escape velocity of the host dark matter halo, ~1000 km/s. A large fraction of the available molecular gas could thus be converted into stars via a burst protracted by the resulting gas fountain, until an AGN-driven outflow can eject the remaining gas.

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