Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998stin...9918963h&link_type=abstract
Technical Report, NRO-460
Astronomy and Astrophysics
Astronomy
Interstellar Chemistry, Cyanides, Hydrocyanic Acid, Molecular Clouds, Cores, Abundance, Interstellar Matter, Isomers, Temperature Dependence, Chemical Reactions, Radio Astronomy, Density (Mass/Volume), Ratios
Scientific paper
We have determined the abundances of HCN and HNC toward 19 nearby dark cloud cores by observations of optically thin H(sup 13)CN (J=1-0) and HN(sup 13)C (J=1-0) lines. The column density of HCN is found to be correlated with that of HNC. The abundance ratio of [HNC]/[HCN] is determined to be 0.54-4.5 in the observed dark cloud cores. These results are consistent with the idea that HCN and HNC are produced mainly by a recombination reaction of HCNH(+) with electrons in cold dark cloud cores. Furthermore, the [HNC]/[HCN] ratio does not show any significant differences between star forming cores and starless cores. The HCN and HNC abundances are compared with those for the OMC-1 cores previously reported. Although the abundances of HCN in the OMC-1 cores are comparable to those in the dark cloud cores, the abundances of HNC in OMC-1 are 1-2 orders of magnitude less than those in dark cloud cores. It is suggested that HNC is destroyed by neutral-neutral reactions in high kinetic temperature regions.
Hirota Tomoya
Mikami Hitomi
Ohishi Masatoshi
Yamamoto Satoshi
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