Comet and ISM Composition Comparison
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Comet and ISM Composition Comparison. - PowerPoint PPT Presentation
Transcript of Comet and ISM Composition Comparison
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Species T_s* ISM-Gas ISM-Dust Most Comets P/Halley Hyakutake Hale-Bopp Implications
H2O 152 100 100 100 100 100 100 -
CH3OH 99 4-5 1 1-5 1.5 0.023 0.049Consistent with grains in ISM cloud cores
HCN 95 2 - 0.02 0.1 - - -
NH3 78 1 10 0.1-2 0.1-2 0.25 - Consistent with molecular clouds
CO2 72 10 0-3 - 2-4 5 - -
H2CO 64 0.2-1 - 0.5 0-5 0.002 - Variable in P/Halley
CH4 31 0.2-7 0-5 0.02 - 0.7 -First good detection in Hyakutake
CO 25 1000 13 1-7 7 5-5.8 6.4Distributed source and nuclear source in Halley
N2 22 10-1000 - 0.1 5 - - -
S2 20 - - 0.03 - 0.01 - Seen in only 1 comet before
C2H6 - - - - - 0.4 0.13 Could be a lower limit
CH4:CO - 0.001-0.003 0.13-2.4 - - 0.12 - -
Comet and ISM Composition Comparison
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