宇宙致密气体的历史：从ASPECS到ngVLA
Dense Gas History of the Universe: from ASPECS to the ngVLA
摘要：
我们回顾了宇宙平均分子气体密度的演变，大回头看的时间，使用CO的旋转跃迁的观测。分子气体是星系中恒星形成的燃料。对遥远星系的CO辐射的深入研究已经描绘出分子气体的密度回到$z \sim 5$，或者在大爆炸的1~Gyr之内。结果显示，气体密度的上升和下降与宇宙恒星形成率密度的上升和下降平行，并可能驱动宇宙恒星形成率密度的上升和下降。我们提出了下一代甚大阵列的潜力，以图像的早期星系中的分子气体的分布和动力学，并作出宇宙的致密气体的历史的精确测量。
英文摘要：
We review the evolution of the cosmic average molecular gas density to large look-back times, using observations of rotational transitions of CO. Molecular gas is the fuel for star formation in galaxies. Deep searches for CO emission from distant galaxies have delineated the density of molecular gas back to $z \sim 5$, or within 1~Gyr of the Big Bang. The results show a rise and fall in the gas density that parallels, and likely drives, the rise and fall of the cosmic star formation rate density. We present the potential for the next generation Very Large Array to image the distribution and dynamics of the molecular gas in early galaxies, and to make a precise measurement of the dense gas history of the Universe.
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