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Maser emissions from comets

Published online by Cambridge University Press:  03 August 2017

Pierre Colom ,
Dominique Bockelée-Morvan ,
Jacques Crovisier  and
Éric Gérard
Pierre Colom
Affiliation:
Observatoire de Paris, 5 pl. J. Janssen, F-92195 Meudon, France
Dominique Bockelée-Morvan
Affiliation:
Observatoire de Paris, 5 pl. J. Janssen, F-92195 Meudon, France
Jacques Crovisier
Affiliation:
Observatoire de Paris, 5 pl. J. Janssen, F-92195 Meudon, France
Éric Gérard
Affiliation:
Observatoire de Paris, 5 pl. J. Janssen, F-92195 Meudon, France

Abstract

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The 18-cm lines of the OH radical are the only well-documented masers in comets. They have been observed in more than 65 comets since 1973. The good knowledge of their excitation mechanisms and their linear regime allow us to estimate the water production rate and its variation with heliocentric distance from radio observations of OH in comets. Two bright comets, C/1996 B2 (Hyakutake) and C/1995 01 (Hale-Bopp), recently passed perihelion. We give an account of their observing campaigns and of the new insights they provide in the physics of comets. We also discuss the possibility of masering emission for other cometary molecules: H2O, CH, CH3OH.

Type
Part 6. Comets
Information
Symposium - International Astronomical Union , Volume 206: Cosmic Masers: From Protostars to Blackholes , 2002 , pp. 443 - 450
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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