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Collisional quenching of OH radio emission from comet Hale-BoppObservations of comets in the 18-cm OH transitions offer a means to probe gas production, kinematics, and OH excitation in comets. We present initial results of OH observations of comet Hale-Bopp obtained with the NRAO 43 m antenna located in Greenbank, WV. Maps of the emission provide strong constraints on the amount of quenching of the inversion of the OH ground state A-doublet in the coma. Analysis of the total radio OH flux and maps of its radial brightness distribution indicate a quenched region on the order of approximately 500,000 km during March and April 1997. This large value is generally consistent with previous observations of radio OH quenching in lower production rate comets when the high production rate of comet Hale-Bopp is considered.
Document ID
20040088878
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Schloerb, F. P.
(Five College Radio Astronomy Observatory, University of Massachusetts Amherst 01003, United States)
Devries, C. H.
Lovell, A. J.
Irvine, W. M.
Senay, M.
Wootten, H. A.
Ferris, J. P.
Date Acquired
August 21, 2013
Publication Date
January 1, 1997
Publication Information
Publication: Earth, moon, and planets
Volume: 78
Issue: 3-Jan
ISSN: 0167-9295
Subject Category
Lunar And Planetary Science And Exploration
Funding Number(s)
CONTRACT_GRANT: NAGW-1483
CONTRACT_GRANT: AST-9615610
CONTRACT_GRANT: NAG5-4743
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Exobiology
Non-NASA Center

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