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首页> 外文期刊>Nature >Carbon monoxide emission as a precise tracer of molecular gas in the Andromeda galaxy
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Carbon monoxide emission as a precise tracer of molecular gas in the Andromeda galaxy

机译：一氧化碳的排放是仙女座星系中分子气体的精确示踪剂

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Stars are known to form in clouds of cold molecular hydrogen, which are relatively poorly understood despite being one of the maul components of the interstellar medium. The problem is that H_2 is invisible in the cold interstellar medium, so its distribution and motion must be inferred from observations of minor constituents of the clouds, such as carbon monoxide and dust. Most of our present knowledge comes from observations of CO emission, but there is much debate on whether this is an effective tracer of H_2: it might miss a large fraction of the molecular gas. It is difficult to address this question on the basis of observations within the Milky Way alone, whose edge-on orientation makes it hard to discern the distant cloud structures. We have therefore surveyed the CO emission of the molecular clouds of M31 (the Andromeda galaxy), the nearest spiral galaxy to the Milky Way, and investigated the extent to which it follows the extinction of starlight by dust. We find a remarkably tight association between the CO emission and the dust, from which we conclude that CO does indeed trace all of the molecular gas.
机译：已知恒星是在冷分子氢云中形成的，尽管它是星际介质的泥浆成分之一，但对它的了解相对较少。问题在于H_2在冷的星际介质中是不可见的，因此必须根据对云中微量成分（例如一氧化碳和粉尘）的观察来推断其分布和运动。我们目前的大多数知识都来自对CO排放的观察，但是关于这是否是H_2的有效示踪剂，存在很多争议：它可能会遗漏很大一部分分子气体。仅凭银河系内的观测结果很难解决这个问题，因为银河系的边缘朝向使得很难辨别远处的云结构。因此，我们调查了距离银河系最近的旋涡星系M31（仙女座星系）分子云的CO排放，并研究了尘埃使星光消灭的程度。我们发现一氧化碳排放与粉尘之间有非常紧密的联系，由此可以得出结论，一氧化碳确实可以追踪所有分子气体。

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