论文标题
$ \ rm l_ {1.4GHz} $和$ \ rm l^{\ prime} _ {co} $之间的经验关系，分子气体质量密度的宇宙演变来自
Cosmic evolution of molecular gas mass density from an empirical relation between $\rm L_{1.4GHz}$ and $\rm L^{\prime}_{CO}$
论文作者
论文摘要
从历史上看，GHz无线电发射已被广泛用于表征星系中的恒星形成活性。在这项工作中，我们寻找无线电发光度，红外发光度和基于CO的分子气体的经验关系。我们组装了278个附近星系的样本，并测量无线电连续体和总红外排放，以及$^{12} $ CO（J = 1-0）发射线。我们发现无线电连续体与CO发射线（散射为0.36 DEX）之间的相关性，在大量不同的星系样本中。利用这种相关性，我们探索了分子气体质量函数的演变和六个红移箱的宇宙分子气体质量密度，最高为$ z = 1.5 $。这些结果与以前的半分析预测和直接测量相一致：宇宙分子气体密度最高$ z = 1.5 $。此外，我们在探索的亮度上发现了一个跨五个数量级的单个平面，散射为0.27 dex。这些相关性足够强大，可以用于不存在CO测量的样品。
Historically, GHz radio emission has been used extensively to characterize the star-formation activity in galaxies. In this work, we look for empirical relations amongst the radio luminosity, the infrared luminosity, and the CO-based molecular gas mass. We assemble a sample of 278 nearby galaxies with measurements of radio continuum and total infrared emission, and the $^{12}$CO (J = 1-0) emission line. We find a correlation between the radio continuum and the CO emission line (with a scatter of 0.36 dex), in a large sample of different kind of galaxies. Making use of this correlation, we explore the evolution of the molecular gas mass function and the cosmological molecular gas mass density in six redshift bins up to $z = 1.5$. These results agree with previous semi-analytic predictions and direct measurements: the cosmic molecular gas density increases up to $z=1.5$. In addition, we find a single plane across five orders of magnitude for the explored luminosities, with a scatter of 0.27 dex. These correlations are sufficiently robust to be used for samples where no CO measurements exist.
