Title

Collisional quenching of OH radio emission from comet Hale-Bopp

Publication Date

1997

Journal or Book Title

EARTH MOON AND PLANETS

Abstract

Observations 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 Λ-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 ∼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.

Comments

The published version is located at http://www.springerlink.com/content/w1p0345412416x3u/

Volume

78

Pages

45-51

Issue

1-3

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