Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994icar..107..322k&link_type=abstract
Icarus, vol. 107, no. 2, p. 322-334
Astronomy and Astrophysics
Astronomy
28
Cosmic Dust, Cyanogen, Gas Jets, Halley'S Comet, Radio Sources (Astronomy), Photochemical Reactions, Plasma Diagnostics, Radio Astronomy, Spatial Distribution, Comets, Halley, Cn Radical, Cyanogen, Jetting, Jets, Photodissociation, Outgassing, Intensity, Comae, Procedure, Comparison, Analysis, Model, Comet Nuclei, Photochemistry, Origin, Source, Procedure, Distance, Density, Production Rate, Molecules, Hypotheses, Monte Carlo Method, Grains, Parent Material
Scientific paper
We examined radial intensity profiles of CN jets in comparison with the diffuse, isotropic component of the CN coma of Comet P/Halley. All images were bias-subtracted, flat-fielded, and continuum-subtracted. We calculated the diffuse profiles by finding the azimuthal mean of the coma least contaminated by jets yielding profiles similar to those of vectorial and Haser models of simple photodissociation. We found the jet profiles by calculating a mean around a Gaussian-fitted center in r-theta space. There is an unmistakable difference between the profiles of the CN jets and the profiles of the diffuse CN. Spatial derivatives of these profiles, corrected for geometrical expansion, show that the diffuse component is consistent with a simple photodissociation process, but the jet component is not. The peak production of the jet profile occurs 6000 km from the nucleus at a heliocentric distance of 1.4 AU. Modeling of both components of the coma indicate results that are consistent with the diffuse CN photochemically produced, but the CN jets need an additional extended source. We found that about one-half of the CN in the coma of Comet P/Halley originated from the jets, the rest from the diffuse component. These features, along with the width of the jet being approximately constant, are consistent with a CHON grain origin for the jets.
A'Hearn Michael F.
Klavetter James Jay
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