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- W1993671389 abstract "We present a theoretical investigation of CN and HCN molecule formation in dense interstellar clouds. We study the gas-phase CN and HCN production efficiencies from the outer photon-dominated regions (PDRs) into the opaque cosmic-ray-dominated cores. We calculate the equilibrium densities of CN and HCN and of the associated species C+, C, and CO, as functions of the far-ultraviolet (FUV) optical depth. We consider isothermal gas at 50 K, with hydrogen particle densities from 102 to 106 cm-3. We study clouds that are exposed to FUV fields with intensities (at 1000 Å) from 1 × 10-18 to 1 × 10-14 ergs s-1 cm-2 Hz-1 sr-1, or 20 to 2 × 105 times the mean interstellar FUV intensity. We assume cosmic-ray H2 ionization rates ranging from 5 × 10-17 s-1 to an enhanced value of 5 × 10-16 s-1. We also examine the sensitivity of the density profiles to the gas-phase sulfur abundance." @default.
- W1993671389 created "2016-06-24" @default.
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- W1993671389 date "2005-10-10" @default.
- W1993671389 modified "2023-09-26" @default.
- W1993671389 title "CN and HCN in Dense Interstellar Clouds" @default.
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- W1993671389 doi "https://doi.org/10.1086/432864" @default.
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