Matches in SemOpenAlex for { <https://semopenalex.org/work/W2891557838> ?p ?o ?g. }
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- W2891557838 startingPage "4277" @default.
- W2891557838 abstract "The C$^{+}$ ion is an important coolant of interstellar gas, and so the [CII] fine structure line is frequently observed in the interstellar medium. However, the physical and chemical properties of the [CII]-emitting gas are still unclear. We carry out non-LTE radiative transfer simulations with RADMC-3D to study the [CII] line emission from a young, turbulent molecular cloud before the onset of star formation, using data from the SILCC-Zoom project. The [CII] emission is optically thick over 40% of the observable area with $I_{[textrm{CII}]} > 0.5$ K km s$^{-1}$. To determine the physical properties of the [CII] emitting gas, we treat the [CII] emission as optically thin. We find that the [CII] emission originates primarily from cold, moderate density gas ($40 lesssim T lesssim 65$ K and $50 lesssim n lesssim 440$ cm$^{-3}$), composed mainly of atomic hydrogen and with an effective visual extinction between $sim 0.50$ and $sim 0.91$. Gas dominated by molecular hydrogen contributes only $lesssim$20% of the total [CII] line emission. Thus, [CII] is not a good tracer for CO-dark H$_2$ at this early phase in the cloud's lifetime. We also find that the total gas, H and C$^+$ column densities are all correlated with the integrated [CII] line emission, with power law slopes ranging from 0.5 to 0.7. Further, the median ratio between the total column density and the [CII] line emission is $Y_{{rm CII}}approx 1.1 times 10^{21}$ cm$^{-2}$ (K km s$^{-1}$)$^{-1}$, and $Y_{{rm CII}}$ scales with $I_{[textrm{CII}]}^{-0.3}$. We expect $Y_{{rm CII}}$ to change in environments with a lower or higher radiation field than simulated here." @default.
- W2891557838 created "2018-09-27" @default.
- W2891557838 creator A5018273831 @default.
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- W2891557838 date "2018-09-18" @default.
- W2891557838 modified "2023-10-15" @default.
- W2891557838 title "Synthetic [C ii] emission maps of a simulated molecular cloud in formation" @default.
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