The ALMA REBELS survey: the dust-obscured cosmic star formation rate density at redshift 7
The ALMA REBELS survey: the dust-obscured cosmic star formation rate density at redshift 7
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ALMA REBELS 调查：尘埃遮挡的红移 7 处的宇宙恒星形成速率密度
DOI：
10.1093/mnras/stac3195
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发表时间：
2023
影响因子：
4.8
通讯作者：
and van der Werf
中科院分区：
文献类型：
--
作者：
Algera;Inami;Oesch;Sommovigo;Bouwens;Topping;Schouws;Stefanon;Stark;Aravena;Barrufet;da Cunha;Dayal;Endsley;Ferrara;Fudamoto;Gonzalez;Graziani;Hodge;Hygate;de Looze;Nanayakkara;Schneider;and van der Werf
宇宙尘埃是塑造星系演化及其观测特征的重要组成部分。早期宇宙中尘埃形成的速度有多快仍然是一个悬而未决的问题，需要在（亚）毫米波长下进行深入观测才能解决。在这里，我们利用阿塔卡马大型毫米波阵列对再电离时代明亮发射线巡天 (REBELS) 及其试点项目中的 45 个星系进行观测，旨在通过叠加分析来研究高红移星系的尘埃含量，该试点项目旨在针对 UV 选择星系 atz∼7 中的 [Cii] 和尘埃发射。我们发现，模糊恒星形成的典型比例 fobs= SFRIR/SFRUV+IR 取决于恒星质量，类似于在较低红移下观察到的情况，对于 log10(M⋆/M⊙) = 9.4–10.4 的星系，其范围为 fobs≈ 0.3 − 0.6。我们进一步采用文献中的z∼7恒星质量函数从REBELS巡天中提取隐藏的宇宙恒星形成率密度（SFRD）。我们的结果表明，在 3 ≲z≲ 7 之间，SFRD 仅略有下降，尘埃遮蔽的恒星形成仍然对 z∼ 7 有贡献。虽然我们广泛讨论了潜在的警告，但我们的分析强调了尘埃遮蔽的恒星形成的持续重要性，即使是在再电离时代。
Cosmic dust is an essential component shaping both the evolution of galaxies and their observational signatures. How quickly dust builds up in the early Universe remains an open question that requires deep observations at (sub-)millimetre wavelengths to resolve. Here, we use Atacama Large Millimeter Array observations of 45 galaxies from the Reionization Era Bright Emission Line Survey (REBELS) and its pilot programs, designed to target [Cii] and dust emission in UV-selected galaxies atz∼ 7, to investigate the dust content of high-redshift galaxies through a stacking analysis. We find that the typical fraction of obscured star formationfobs= SFRIR/SFRUV+IRdepends on stellar mass, similar to what is observed at lower redshift, and ranges fromfobs≈ 0.3 − 0.6 for galaxies with log10(M⋆/M⊙) = 9.4–10.4. We further adopt thez∼ 7 stellar mass function from the literature to extract the obscured cosmic star formation rate density (SFRD) from the REBELS survey. Our results suggest only a modest decrease in the SFRD between 3 ≲z≲ 7, with dust-obscured star formation still contributingatz∼ 7. While we extensively discuss potential caveats, our analysis highlights the continued importance of dust-obscured star formation even well into the epoch of reionization.