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HCO+ in the coma of comet Hale-Bopp
A J Lovell1, F P Schloerb, E A Bergin
1Five College Radio Astronomy Observatory, University of Massachusetts, Amherst 01003, USA.
Abstract:
Maps of comet C/1995 O1 (Hale-Bopp) in the millimeter-wave emission of the ion HCO+ revealed a local minimum near the nucleus position, with a maximum about 100,000 km in the antisolar direction. These observed features of the HCO+ emission require a low abundance of HCO+ due to enhanced destruction in the inner coma of the comet, within a region of low electron temperature (Te). To set constraints on the formation of HCO+ in the coma, as well as the location and magnitude of the transition to higher Te, the data are compared with the results of ion-molecule chemistry models.
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