Physics
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997em%26p...77..259w&link_type=abstract
Earth, Moon, and Planets, v. 77, Issue 3, p. 259-264 (1997).
Physics
8
Comet Hale-Bopp, Ions, Hco^+
Scientific paper
On-the-Fly maps of emission from the HCO^+ J = 3-2 transition at 267.6 GHz were obtained of C/1995 O1 (Hale-Bopp) on 1997 Mar 15.6 UT using the NRAO 12-m telescope with high spatial resolution. Unlike the relatively symmetric and centralized maps of the neutral species CO, HCN and H_2CO, the spatial extent of HCO^+ emission is very diffuse with a complex structure characterized by at least two physically different regions. The bulk of the HCO^+ emission peaks in intensity ~175,000 km anti-sunward from the nuclear position. This peak emission does not fall directly along the anti-sunward direction, but is rotated by ~10 degrees toward the east from the anti-sunward direction. A substantial void, or decrease, of HCO^+ emission is observed within ~ 55,000 km of the nucleus. The HCO^+ emission in this void is roughly half the intensity of the emission observed 100,000 km away. This decrease of HCO^+ emission near the nucleus may indicate that production or excitation of HCO^+ is inhibited, or perhaps that HCO^+ is easily destroyed in the inner coma, especially within ~50,000 km of the nucleus. This void roughly coincides with the approximate location and size of the so-called ``diamagnetic cavity'' in the coma and may mark a significant transition region in the inner coma of Hale-Bopp
Alan Stern S.
Festou Michael C.
Homich A. A.
Mangum Jeffrey
Uhl W. T.
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