Dust in the Reionization Era: ALMA Observations of a z=8.38 Gravitationally Lensed Galaxy
Dust in the Reionization Era: ALMA Observations of a z=8.38 Gravitationally Lensed Galaxy
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DOI：
10.3847/2041-8213/aa62aa
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发表时间：
2017-03-10
影响因子：
7.9
通讯作者：
Streblyanska, A.
中科院分区：
文献类型：
--
作者：
Laporte, N.;Ellis, R. S.;Streblyanska, A.
我们报告的详细分析引力透镜Y波段辍学，A2744_YD4，从深哈勃空间望远镜成像的前沿场集群阿贝尔2744。带7与阿塔卡马大型毫米/亚毫米阵列（阿尔马）的观测表明，一个显着的1毫米连续通量的近距离检测表明存在尘埃的恒星形成星系的光度红移z类似或等于8。深X-SHOOTER光谱通过在红移z = 8.38处检测到Ly α发射证实了A2744_YD4的高红移身份。与阿尔马检测的关联被确认的存在下，[O III] 88 μ m发射在相同的红移。虽然这两个发射功能只在4西格玛水平显着，我们认为他们的联合检测和位置重合与高红移辍学的哈勃太空望远镜图像证实了物理关联。分析现有的光度数据和适度的引力放大率（mu近似或等于2）表明A2744_YD4的恒星质量近似为2。X. 10（9）M圆点表示星星的形成速率近似于20近似或等于2亿年-1，尘埃质量近似于6。X. 10（6）M圈点我们讨论了宇宙再电离开始后仅相当于或等于2亿年的尘埃团形成的含义。
We report on the detailed analysis of a gravitationally lensed Y-band dropout, A2744_YD4, selected from deep Hubble Space Telescope imaging in the Frontier Field cluster Abell 2744. Band 7 observations with the Atacama Large Millimeter/submillimeter Array (ALMA) indicate the proximate detection of a significant 1 mm continuum flux suggesting the presence of dust for a star-forming galaxy with a photometric redshift of z similar or equal to 8. Deep X-SHOOTER spectra confirms the high-redshift identity of A2744_YD4 via the detection of Ly alpha emission at a redshift z = 8.38. The association with the ALMA detection is confirmed by the presence of [O III] 88 mu m emission at the same redshift. Although both emission features are only significant at the 4 sigma level, we argue their joint detection and the positional coincidence with a high-redshift dropout in the Hubble Space Telescope images confirms the physical association. Analysis of the available photometric data and the modest gravitational magnification (mu similar or equal to 2) indicates A2744_YD4 has a stellar mass of similar to 2. x. 10(9) M-circle dot a star formation rate of similar to 20 similar or equal to 200 Myr-1 and a dust mass of similar to 6. x. 10(6) M-circle dot We discuss the implications of the formation of such a dust mass only similar or equal to 200 Myr after the onset of cosmic reionization.