Millimeter-wavelength Images of Gaseous Emission in C/1995 O1 (Hale-Bopp)
M. Womack (St. Cloud State University), M.C. Festou (Obs. Midi-Pyrenees), J. Mangum (NRAO), S.A. Stern (SWRI-Boulder)
On-the-Fly maps of emission were obtained for
CO, HCN, H CO and HCO rotational transitions
in the range of 226 - 267 GHz in Comet Hale-Bopp during
perihelion using the NRAO 12-m telescope with high
spectral resolution. The data show that HCN emission
appears roughly symmetric about the center of
brightness, while CO emission is elongated roughly
along the sun-comet-tail direction. The HCO
map is more diffuse than the maps of the
neutral species and its maximal brightness appears
significantly offset from the nucleus along the
tailward direction. Image maps, spectra and spatial
profiles will be presented and implications for
constraining physical and chemical models of
the inner coma will be discussed.