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arXiv 0903.3046astro-ph.CO
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来自光学和近红外未探测亚毫米星系GN10的CO发射线

A CO emission line from the optical and near-IR undetected submillimeter galaxy GN10

E. Daddi, H. Dannerbauer, M. Krips, F. Walter, M. Dickinson, D. Elbaz, G. E. Morrison

摘要:

本文报道了在GOODS-N场中观测到的亚毫米星系GN 10的CO发射线。GN 10在哈勃太空望远镜和地面设施获得的极深光学和近红外成像方面缺乏任何对应物。这是一个典型的被尘埃严重遮蔽的源的情况,实际上不可能在光学/近红外中推导出光谱红移。假设GN 10是先前在同一场中在z~4.05处确定的原簇结构的一部分,我们用IRAM Plateau de Bure干涉仪在91.4 GHz处搜索CO[4-3],并成功检测到一条线我们发现最有可能的红移识别是z=4.0424+-0.0013,基于:1)CO线实际上是从不同的红移偶然发现的机会非常低; 2)无线电-红外光度红移分析; 3)相同的无线电-红外SED,在一个比例因子内,在相同的红移的两个其他SMG。在光学/近红外波长处的微弱需要A_V~5-7.5 mag.这一结果支持的情况下,非常高的z SMG的存在,已经错过了以前的光谱调查的人口相当大的。这是第一次,CO发射线已被检测到的星系是不可见的光学和近红外。我们的工作表明,现有的和计划中的设施完成普查的恒星形成和恒星质量在遥远的宇宙通过测量红移的最模糊的星系通过毫米光谱。

英文摘要:

We report the detection of a CO emission line from the submillimiter galaxy (SMG) GN10 in the GOODS-N field. GN10 lacks any counterpart in extremely deep optical and near-IR imaging obtained with the Hubble Space Telescope and ground-based facilities. This is a prototypical case of a source that is extremely obscured by dust, for which it is practically impossible to derive a spectroscopic redshift in the optical/near-IR. Under the hypothesis that GN10 is part of a proto-cluster structure previously identified at z~4.05 in the same field, we searched for CO[4-3] at 91.4 GHz with the IRAM Plateau de Bure Interferometer, and successfully detected a line. We find that the most likely redshift identification is z=4.0424+-0.0013, based on: 1) the very low chance that the CO line is actually serendipitous from a different redshift; 2) a radio-IR photometric redshift analysis; 3) the identical radio-IR SED, within a scaling factor, of two other SMGs at the same redshift. The faintness at optical/near-IR wavelengths requires an attenuation of A_V~5-7.5 mag. This result supports the case that a substantial population of very high-z SMGs exists that had been missed by previous spectroscopic surveys. This is the first time that a CO emission line has been detected for a galaxy that is invisible in the optical and near-IR. Our work demonstrates the power of existing and planned facilities for completing the census of star formation and stellar mass in the distant Universe by measuring redshifts of the most obscured galaxies through millimeter spectroscopy.

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