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An extended source for CN jets in Comet P/HalleyWe 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.
Document ID
19950030483
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Klavetter, James Jay
(Univ. of Maryland, College Park, MD United States)
A'Hearn, Michael F.
(Univ. of Maryland, College Park, MD United States)
Date Acquired
August 16, 2013
Publication Date
February 1, 1994
Publication Information
Publication: ICARUS
Volume: 107
Issue: 2
ISSN: 0019-1035
Subject Category
Astrophysics
Accession Number
95A62082
Funding Number(s)
CONTRACT_GRANT: NAGW-1886
Distribution Limits
Public
Copyright
Other

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