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arXiv 2008.04329astro-ph.GA
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MOSDEF巡天:校准H $α$恒星形成率和$1.4 < z < 2.6$射电连续发光度之间的关系

The MOSDEF Survey: Calibrating the relationship between H$α$ star-formation rate and radio continuum luminosity at $1.4 < z < 2.6$

Kenneth J. Duncan, Irene Shivaei, Alice E. Shapley, Naveen A. Reddy, Bahram Mobasher, Alison L. Coil, Mariska Kriek, Brian Siana

摘要:

观测到的低红移星系的恒星形成率(SFR)和它们的射电连续发光度之间的经验关系提供了一种潜在的方法来测量高红移星系的SFR,不受尘埃遮蔽的影响。在这项研究中,我们首次使用尘埃校正的H $α$ SFR在高红移下对SFR-射电连续谱关系中的红移演化进行了测试。我们的样本由来自$1.4 < z < 2.6$的MOSFIRE深演化场(MOSDEF)巡天的178个星系组成,这些星系具有静止标架光谱学和来自Karl G. Jansky甚大阵列(VLA)货物北场。使用叠加分析,我们比较观测到的无线电连续发光与预测的灰尘校正H $α$ SFR假设范围内的$z\sim0$关系。我们没有发现一个系统的演化与红移的证据时,堆积的无线电连续作为一个功能的尘埃校正H $α$ SFR和堆积时,光谱和无线电连续作为恒星质量的函数。我们的结论是,本地校准的SFR和无线电连续发光度之间的关系仍然有效的$z\sim 2$。

英文摘要:

The observed empirical relation between the star-formation rates (SFR) of low-redshift galaxies and their radio continuum luminosity offers a potential means of measuring SFR in high redshift galaxies that is unaffected by dust obscuration. In this study, we make the first test for redshift evolution in the SFR-radio continuum relation at high redshift using dust-corrected H$α$ SFR. Our sample consists of 178 galaxies from the MOSFIRE Deep Evolution Field (MOSDEF) Survey at $1.4 < z < 2.6$ with rest-frame optical spectroscopy and deep 1.5 GHz radio continuum observations from the Karl G. Jansky Very Large Array (VLA) GOODS North field. Using a stacking analysis we compare the observed radio continuum luminosities with those predicted from the dust-corrected H$α$ SFR assuming a range of $z\sim0$ relations. We find no evidence for a systematic evolution with redshift, when stacking the radio continuum as a function of dust-corrected H$α$ SFR and when stacking both optical spectroscopy and radio continuum as a function of stellar mass. We conclude that locally calibrated relations between SFR and radio continuum luminosity remain valid out to $z\sim 2$.

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