Observations of HCN, HNC, and NH3 in Comet Hale-Bopp

Details Observations of HCN, HNC, and NH3 in Comet Hale-Bopp Observations of HCN, HNC, and NH3 in Comet Hale-Bopp

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999stin...0070356h&link_type=abstract

Technical Report, NRO-486

Other

Density Distribution, Errors, Hydrocyanic Acid, Ammonia, Excitation, Inversions, Scanners, Hale-Bopp Comet

Scientific paper

We have observed the J=1-0 rotational lines of HCN and HNC, and the (J, K) (1,1), (2,2), and (3,3) inversion lines of NH3 toward comet Hale-Bopp during 19-21 April, 1997. We have made a cross scan toward the coma, and have found the source sizes of HCN and HNC to be (38 +/- 7) in.. and (50 +/- 18) in., respectively. The [HNCl/[HCN] abundance ratios are obtained to be 0.13 +/- 0.03 and 0.36 +/- 0.32 at the center of the coma and the outer part, respectively. Although the source size of HNC might be slightly larger than that of HCN, the distributions of these two species almost agree with each other within the error limits. Since HCN and HNC are suggested to be a parent molecule and a product of coma (-heinistry, respectively, the present results indicate that the production of HNC is occurring in the inner coma region. We have calculated the density distributions of HCN and HNC in the coma of comet Hale-Bopp by assuming a simple chemical model. The calculated HNC/HCN ratio is almost constant in the coma, which is consistent with our observations. In addition, the average excitation temperature is found from the observations of the NH3 lines to be 54 +/- 45 K with the 74 in. beam, corresponding to the coma size of 8.6 x 104 km.

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