The Evolution of the IR Luminosity Function and Dust-obscured Star Formation over the Past 13 Billion Years-猫眼课题宝

DOI：

10.3847/1538-4357/abdb27

发表时间：

2021-01

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

J. Zavala;C. Casey;S. Manning;M. Aravena;M. Béthermin;K. Caputi;D. Clements;E. D. Cunha;P. Drew;S. Finkelstein;S. Fujimoto;C. Hayward;J. Hodge;J. Kartaltepe;K. Knudsen;A. Koekemoer;A. Long;G. Magdis;A. Man;G. Popping;D. Sanders;N. Scoville;K. Sheth;J. Staguhn;S. Toft;E. Treister;J. Vieira;M. Yun

我们介绍了从映射遮挡到再电离与ALMA(MORA)测量的第一个结果，这是迄今为止最大的阿塔卡马大毫米/亚毫米阵列(ALMA)空场连续测量(184 Arcmin2)，也是唯一一个在2 mm处搜索尘埃恒星形成星系(DSFGs)的观测结果。我们使用在5σ以上探测到的13个源来估计在这个波长上的第一个ALMA星系数。然后，将这些数量与1.2毫米和3毫米的最新星系数量计数和反向演化模型结合起来，对过去130亿年红外光度函数的演化和尘埃恒星的形成施加限制。我们的结果表明DSFG的空间密度发生了陡峭的红移演化，并证实了红外光度函数在微弱光度下的平坦化，斜率为。我们得出的结论是，尘埃遮挡部分在z≈2-2.5时达到峰值，在过去的120亿年中一直主导着恒星形成的宇宙历史，可追溯到z∼4。在z=5时，尘埃遮挡恒星的形成估计占总恒星形成率密度的35%，当z=6-7时，尘埃遮挡恒星的形成减少到25%-20%，这意味着在宇宙的第一个10亿年中，尘埃覆盖的恒星形成的贡献很小。由于尘埃遮蔽的恒星形成历史一直限制到再电离时代的结束，我们的结果为检验星系形成模型、研究星系质量集合史和了解早期宇宙中的尘埃和金属丰度提供了一个基准。

We present the first results from the Mapping Obscuration to Reionization with ALMA (MORA) survey, the largest Atacama Large Millimeter/submillimeter Array (ALMA) blank-field contiguous survey to date (184 arcmin2) and the only at 2 mm to search for dusty star-forming galaxies (DSFGs). We use the 13 sources detected above 5σ to estimate the first ALMA galaxy number counts at this wavelength. These number counts are then combined with the state-of-the-art galaxy number counts at 1.2 and 3 mm and with a backward evolution model to place constraints on the evolution of the IR luminosity function and dust-obscured star formation in the past 13 billion years. Our results suggest a steep redshift evolution on the space density of DSFGs and confirm the flattening of the IR luminosity function at faint luminosities, with a slope of . We conclude that the dust-obscured component, which peaks at z ≈ 2–2.5, has dominated the cosmic history of star formation for the past ∼12 billion years, back to z ∼ 4. At z = 5, the dust-obscured star formation is estimated to be ∼35% of the total star formation rate density and decreases to 25%–20% at z = 6–7, implying a minor contribution of dust-enshrouded star formation in the first billion years of the universe. With the dust-obscured star formation history constrained up to the end of the epoch of reionization, our results provide a benchmark to test galaxy formation models, to study the galaxy mass assembly history, and to understand the dust and metal enrichment of the universe at early times.

The Evolution of the IR Luminosity Function and Dust-obscured Star Formation over the Past 13 Billion Years

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