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arXiv 1901.11222astro-ph.GA
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z < 1.3时1.4GHz宇宙星的形成历史

The 1.4 GHz Cosmic Star Formation History at z < 1.3

James E. Upjohn, Michael J. I. Brown, Andrew M. Hopkins, Nicolas J. Bonne

摘要:

我们测量的宇宙恒星形成的历史,z = 1.3,使用的样本918无线电选择的恒星形成星系内的2平方度的COSMOS领域。为了增加我们的样本量,我们结合了1.4 GHz的通量密度从VLA-COSMOS目录的VLA-COSMOS无线电连续图像在I < 26.5星系的位置测得的通量密度,使我们能够检测到1.4 GHz的源微弱的40 μ Jy。我们发现宇宙恒星形成历史的无线电测量高度依赖于样本的完整性和用于外推无线电光度函数的暗端的模型。对于我们的首选模型的光度函数,我们发现恒星形成率密度从0.019太阳质量每年每立方Mpc在z = 0.225增加到0.104太阳质量每年每立方Mpc,这同意在33%的最近的紫外线,红外线和3 GHz的宇宙恒星形成历史的测量。

英文摘要:

We measure the cosmic star formation history out to z = 1.3 using a sample of 918 radio-selected star forming galaxies within the 2 square degree COSMOS field. To increase our sample size, we combine 1.4 GHz flux densities from the VLA-COSMOS catalogue with flux densities measured from the VLA-COSMOS radio continuum image at the positions of I < 26.5 galaxies, enabling us to detect 1.4 GHz sources as faint as 40 uJy. We find radio measurements of the cosmic star formation history are highly dependent on sample completeness and models used to extrapolate the faint end of the radio luminosity function. For our preferred model of the luminosity function, we find the star formation rate density increases from 0.019 Solar masses per year per cubic Mpc at z = 0.225 to 0.104 Solar masses per year per cubic Mpc, which agrees to within 33% of recent UV, IR and 3 GHz measurements of the cosmic star formation history.

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