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- W2890180175 abstract "Our understanding of how molecular clouds form in the interstellar medium (ISM) would be greatly helped if we had a reliable observational tracer of the gas flows responsible for forming the clouds. Fine structure emission from singly ionised and neutral carbon ([CII], [CI]) and rotational line emission from CO are all observed to be associated with molecular clouds. However, it remains unclear whether any of these tracers can be used to study the inflow of gas onto an assembling cloud, or whether they primarily trace the cloud once it has already assembled. In this paper, we address this issue with the help of high resolution simulations of molecular cloud formation that include a sophisticated treatment of the chemistry and thermal physics of the ISM. Our simulations demonstrate that both [CI] and CO emission trace gas that is predominantly molecular, with a density n ~ 500-1000 cm$^{-3}$, much larger than the density of the inflowing gas. [CII] traces lower density material (n ~ 100 cm$^{-3}$) that is mainly atomic at early times. A large fraction of the [CII] emission traces the same structures as the [CI] or CO emission, but some arises in the inflowing gas. Unfortunately, this emission is very faint and will be difficult to detect with current observational facilities, even for clouds situated in regions with an elevated interstellar radiation field." @default.
- W2890180175 created "2018-09-27" @default.
- W2890180175 creator A5024376393 @default.
- W2890180175 creator A5035050543 @default.
- W2890180175 creator A5046201168 @default.
- W2890180175 creator A5086910300 @default.
- W2890180175 date "2019-04-20" @default.
- W2890180175 modified "2023-09-29" @default.
- W2890180175 title "Tracing the formation of molecular clouds via [C ii], [C i], and CO emission" @default.
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- W2890180175 doi "https://doi.org/10.1093/mnras/stz1119" @default.
- W2890180175 hasPublicationYear "2019" @default.
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