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- W3041648863 abstract "Recent observations with high angular resolution revealed chemical differentiation in several prestellar cores; while N 2 H + emission peaks at the core center, CO, CS and CCS emission peaks are offset from the center. Molecular abundances also vary among cores; some cores have high CCS abundance and low N 2 H + abundance, but others have less CCS and more N 2 H + . Numerical calculations of a chemical-reaction network in contracting cores show that these differentiations and variations can be diagnostics of physical evolution of cores, because molecular abundances and distributions are determined by the balance between the dynamical and chemical time scales. In prestellar cores, low temperatures and high densities cause adsorption of molecules onto grains. Depletion time scale varies among species; early-phase species deplete first because of destruction via gas-phase reactions in addition to the adsorption. N 2 H + is the last to deplete because of the low adsorption energy of its parent molecule N 2 and depletion of main reactants such as CO. Molecular D/H ratio is another probe of core evolution, since it increases as the adsorption proceeds." @default.
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- W3041648863 date "2004-01-01" @default.
- W3041648863 modified "2023-09-25" @default.
- W3041648863 title "Chemical Signatures of the Evolutionary State of Cores" @default.
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- W3041648863 doi "https://doi.org/10.1017/s0074180900241466" @default.
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