Mosaicked Images and Spectra of J = 1 --> 0 HCN and HCO^+ Emission from Comet Hale-Bopp (1995 O1)

Details Mosaicked Images and Spectra of J = 1 --> 0 HCN and HCO^+ Emission from Comet Hale-Bopp (1995 O1) Mosaicked Images and Spectra of J = 1 --> 0 HCN and HCO^+ Emission from Comet Hale-Bopp (1995 O1)

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....116.3018w&link_type=abstract

The Astronomical Journal, Volume 116, Issue 6, pp. 3018-3028.

Astronomy and Astrophysics

Astronomy

22

Comets: Individual: Name: Hale-Bopp 1995 O1, Techniques: Interferometric

Scientific paper

We used the BIMA array to map comet Hale-Bopp (1995 O1) in HCN and HCO^+ emission at 89 GHz with 10" angular resolution. The mosaicked images with seven pointing centers were combined with single-dish data to form completely sampled images of a region ~4' in diameter. The HCN image is roughly compatible with a Haser model in which most of the HCN comes from the nucleus. However, clear deviations from circular symmetry are present, and roughly 20% of the HCN does not appear to come from the nuclear source. Frequently, the HCN has an asymmetric, double-peaked profile. The double peak is expected from the Haser model, and the asymmetry observed on April 3 could come from an increased gas production toward the Sun and facing the observer. The abundance of HCN relative to H_2O is ~0.3%. The HCO^+, in contrast, is smooth, almost completely resolved in the interferometer observations, and offset toward the ion tail by about 1'. This behavior is compatible with expectations from a simple scaling of previous work.

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