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arXiv 2006.04284astro-ph.GAastro-ph.CO
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哈勃超深场中的ALMA光谱观测:最暗尘埃恒星形成星系的性质

The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: The nature of the faintest dusty star-forming galaxies

Manuel Aravena, Leindert Boogaard, Jorge Gónzalez-López, Roberto Decarli, Fabian Walter, Chris L. Carilli, Ian Smail, Axel Weiss, Roberto J. Assef, Franz Erik B… 展开作者

Manuel Aravena, Leindert Boogaard, Jorge Gónzalez-López, Roberto Decarli, Fabian Walter, Chris L. Carilli, Ian Smail, Axel Weiss, Roberto J. Assef, Franz Erik Bauer, Rychard J. Bouwens, Paulo C. Cortes, Pierre Cox, Elisabete da Cunha, Emanuele Daddi, Tanio Díaz-Santos, Hanae Inami, Rob Ivison, Mladen Novak, Gergö Popping, Dominik Riechers, Paul van der Werf, Jeff Wagg

摘要:

我们提出了一个表征的物理性质的样本35个探测到的,尘埃星系在深ALMA 1.2毫米的图像作为ALMA光谱调查的一部分,在{ \it哈勃}超深场(ASPECS)大计划。该样本由通过光学/红外源位置先验识别的26个额外源补充。利用它们的光谱能量分布,我们分别得到了$4.8\times10^{10}~M_\odot$和30 $M_\odot$ yr $^{-1}$的恒星质量中值和恒星形成率(SFR),以及$(2.4-11.7)\times10^{10}~M_\odot$和$20-50~M_\odot$ yr $^{-1}$的四分位距。我们得出一个中值光谱红移为1.8与四分位数范围$1.1-2.6$,显着低于亚毫米星系在较浅的,广泛的调查。我们发现,在SFR-恒星质量关系或主序(MS)中,分别有59% $\pm$ 13%,6% $\pm$ 4%和34% $\pm$ 9%位于$\pm0.4$ dex之内,高于和低于dex。ASPECS星系密切遵循的SFR分子气体质量关系和其他先前建立的标度关系,确认的气体与恒星的质量比从$z=0.5$到$z=2.5$的一个因素的五个增加和温和的演变的气体耗尽的时间尺度与一个典型的值为0.7 Gyr在$z=1-3$。ASPECS星系位于明显低于MS,一个开发不足的参数空间,有低的气体-恒星质量比的$\sim0.1-0.2$和长的耗尽时标$>1$陀螺仪。在所有红移处,沿着MS的Galerkin支配着分子气体的宇宙密度。主序以上的星系对$z<1$到$z=2.5$的总气藏的贡献越来越大,而MS以下的星系则相反。

英文摘要:

We present a characterization of the physical properties of a sample of 35 securely-detected, dusty galaxies in the deep ALMA 1.2-mm image obtained as part of the ALMA Spectroscopic Survey in the {\it Hubble} Ultra Deep Field (ASPECS) Large Program. This sample is complemented by 26 additional sources identified via an optical/infrared source positional prior. Using their well-characterized spectral energy distributions, we derive median stellar masses and star formation rates (SFR) of $4.8\times10^{10}~M_\odot$ and 30 $M_\odot$ yr$^{-1}$, and interquartile ranges of $(2.4-11.7)\times10^{10}~M_\odot$ and $20-50~M_\odot$ yr$^{-1}$, respectively. We derive a median spectroscopic redshift of 1.8 with an interquartile range $1.1-2.6$, significantly lower than submillimeter galaxies detected in shallower, wide-field surveys. We find that 59\%$\pm$13\%, 6\%$\pm$4\%, and 34\%$\pm$9\% of our sources are within, above and below $\pm0.4$ dex from the SFR-stellar mass relation or main-sequence (MS), respectively. The ASPECS galaxies closely follow the SFR-molecular gas mass relation and other previously established scaling relations, confirming a factor of five increase of the gas-to-stellar mass ratio from $z=0.5$ to $z=2.5$ and a mild evolution of the gas depletion timescales with a typical value of 0.7 Gyr at $z=1-3$. ASPECS galaxies located significantly below the MS, a poorly exploited parameter space, have low gas-to-stellar-mass ratios of $\sim0.1-0.2$ and long depletion timescales $>1$ Gyr. Galaxies along the MS dominate the cosmic density of molecular gas at all redshifts. Systems above the main sequence have an increasing contribution to the total gas reservoirs from $z<1$ to $z=2.5$, while the opposite is found for galaxies below the MS.

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