Mosaiced Images and Spectra of J=1-0 HCN and HCO+ emission from Comet Hale-Bopp (1995 O1)

Details Mosaiced Images and Spectra of J=1-0 HCN and HCO+ emission from Comet Hale-Bopp (1995 O1) Mosaiced Images and Spectra of J=1-0 HCN and HCO+ emission from Comet Hale-Bopp (1995 O1)

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999adil...mw...01w&link_type=abstract

NCSA Astronomy Digital Image Library

Astronomy and Astrophysics

Astronomy

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 arcsecond angular resolution. The mosaiced images with 7 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 towards 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 towards the ion tail by about 1 arcminute. This behavior is compatible with expectations from simple scaling of previous work.

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