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arXiv 1506.04747astro-ph.GA
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大型毫米望远镜的早期科学:z=2.0-4.7时星团透镜亚毫米星系的尘埃连续体和CO发射线的观测

Early Science with the Large Millimeter Telescope: Observations of dust continuum and CO emission lines of cluster-lensed submillimetre galaxies at z=2.0-4.7

J. A. Zavala, M. S. Yun, I. Aretxaga, D. H. Hughes, G. W. Wilson, J. E. Geach, E. Egami, M. A. Gurwell, D. J. Wilner, Ian Smail, A. W. Blain, S. C. Chapman, K. … 展开作者

J. A. Zavala, M. S. Yun, I. Aretxaga, D. H. Hughes, G. W. Wilson, J. E. Geach, E. Egami, M. A. Gurwell, D. J. Wilner, Ian Smail, A. W. Blain, S. C. Chapman, K. E. K. Coppin, M. Dessauges-Zavadsky, A. C. Edge, A. Montana, K. Nakajima, T. D. Rawle, D. Sanchez-Arguelles, A. M. Swinbank, T. M. A. Webb, M. Zeballos

摘要:

我们目前的早期科学观测与大型毫米望远镜,AzTEC 1.1毫米连续图像和宽带光谱(73-111 GHz)获得的红移搜索接收器,对四个明亮的透镜亚毫米星系通过赫歇尔透镜巡天快照和SCUBA-2集群快照调查。该试点项目研究通过引力放大的好处确定的最高红移星系的恒星形成历史和分子气体和尘埃含量的物理特性。我们稳健地检测灰尘连续排放的全部样品和CO排放线的三个目标。我们发现,一个源显示光谱的多样性,是一个混合的三个星系在不同的红移(z=2.040,3.252和4.680),让人想起以前的高分辨率成像后续的无透镜亚毫米星系,但与一个完全不同的搜索方法,证实了最近的理论预测的物理无关的混合星系。确定检测到的线为12 CO(J_up=2-5),我们推导出光谱红移,分子气体质量,和尘埃质量的连续辐射。整个样品的平均H_2气体质量为(2.0 +-0.2)× 10^11 M_sun/μ,平均尘埃质量为(2.0+-0.2)× 10^9 M_sun/μ,其中μ=2-5是预期的透镜放大。利用这些独立的估计,我们推断出气体与尘埃的比值为δ_GDR=55-75,与其他亚毫米星系的测量结果一致。我们放大的高光度星系落在与其他高红移亚毫米星系相同的轨迹上,将在本地发光和超亮红外星系中观察到的L '_CO-L_FIR相关性扩展到更高的FIR和CO光度。

英文摘要:

We present Early Science observations with the Large Millimeter Telescope, AzTEC 1.1 mm continuum images and wide bandwidth spectra (73-111 GHz) acquired with the Redshift Search Receiver, towards four bright lensed submillimetre galaxies identified through the Herschel Lensing Survey-snapshot and the SCUBA-2 Cluster Snapshot Survey. This pilot project studies the star formation history and the physical properties of the molecular gas and dust content of the highest redshift galaxies identified through the benefits of gravitational magnification. We robustly detect dust continuum emission for the full sample and CO emission lines for three of the targets. We find that one source shows spectroscopic multiplicity and is a blend of three galaxies at different redshifts (z=2.040, 3.252 and 4.680), reminiscent of previous high-resolution imaging follow-up of unlensed submillimetre galaxies, but with a completely different search method, that confirm recent theoretical predictions of physically unassociated blended galaxies. Identifying the detected lines as 12CO (J_up=2-5) we derive spectroscopic redshifts, molecular gas masses, and dust masses from the continuum emission. The mean H_2 gas mass of the full sample is (2.0 +- 0.2) x 10^11 M_sun/μ, and the mean dust mass is (2.0+-0.2) x 10^9 M_sun/μ, where μ=2-5 is the expected lens amplification. Using these independent estimations we infer a gas-to-dust ratio of δ_GDR=55-75, in agreement with other measurements of submillimetre galaxies. Our magnified high-luminosity galaxies fall on the same locus as other high-redshift submillimetre galaxies, extending the L'_CO - L_FIR correlation observed for local luminous and ultraluminous infrared galaxies to higher FIR and CO luminosities.

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