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arXiv 2101.04734astro-ph.GA
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IR光度函数的演化和过去130亿年来尘埃遮蔽的恒星形成

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

J. A. Zavala, C. M. Casey, S. M. Manning, M. Aravena, M. Bethermin, K. I. Caputi, D. L. Clements, E. da Cunha, P. Drew, S. L. Finkelstein, S. Fujimoto, C. Haywa… 展开作者

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

摘要:

我们目前的第一个结果,从2毫米映射模糊再电离(MORA)调查,最大的ALMA连续空白领域的调查,迄今为止,总面积为184平方米。弧分,只有在2毫米,以寻找尘埃恒星形成星系(DSFG)。我们使用13个源检测到以上5西格玛估计第一ALMA星系数计数在这个波长。然后将这些数量计数与1.2毫米和3毫米的最先进星系数量计数以及向后演化模型相结合,以限制过去130亿年中红外光度函数和尘埃遮蔽恒星形成的演化。我们的结果表明,一个陡峭的红移的空间密度的DSFG的演变,并确认平坦的红外光度函数在微弱的光度,与$α_{LF} = -0.42^{+0.02}_{-0.04}$的斜率。我们的结论是,尘埃遮蔽的成分,在z=2-2.5处达到峰值,在过去的120亿年里,一直主导着恒星形成的宇宙历史,可以追溯到z~4。在z=5时,尘埃遮蔽的恒星形成估计约占总恒星形成率密度的35%,在z=6-7时下降到25%-20%,这意味着在宇宙的前10亿年中,尘埃遮蔽的恒星形成贡献很小。由于尘埃遮蔽的恒星形成历史被限制到再电离时代的结束,我们的结果提供了一个基准来测试星系形成模型,研究星系质量组装的历史,并了解宇宙早期的尘埃和金属富集。

英文摘要:

We present the first results from the 2mm Mapping Obscuration to Reionization (MORA) survey, the largest ALMA contiguous blank-field survey to-date with a total area of 184 sq. arcmin and the only at 2mm to search for dusty star-forming galaxies (DSFGs). We use the 13 sources detected above 5sigma 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 1.2mm and 3mm and with a backward evolution model to place constraints on the evolution of the IR luminosity function and dust-obscured star formation in the last 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 $α_{LF} = -0.42^{+0.02}_{-0.04}$. 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.

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