Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...304l..33d&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 304, May 1, 1986, p. L33-L36. Research supported by
Astronomy and Astrophysics
Astrophysics
11
Astronomical Spectroscopy, Brightness Distribution, Halley'S Comet, Hydroxyl Emission, Astronomical Maps, Bow Waves, Comet Heads, Interstellar Masers, Shock Waves, Comets, Halley, Brightness, Distribution, Hydroxyl Radical, Emissions, Earth-Based Observations, Comae, Bow Shock, Ice, Fragments, Outgassing
Scientific paper
The first successful VLA observations of OH emission from any comet have been made for comet Halley. In 1985 November, 120 arcsec and 60 arcsec resolution images of the brightness distribution of the 1667 MHz line were obtained. The 120 arcsec image shows that the peak of the OH emission is displaced 40 arcsec to the west and 80 arcsec to the south. The 60 arcsec image shows that the emission is concentrated in 'clumps', which surround a 'hole' in the OH emission. The hole may be the first direct observation of OH maser quenching in the inner cometary coma. The clumps of OH emission can best be explained by bow shock excitation or by large ice fragments broken off the cometary nucleus.
de Pater Imke
Palmer Patrick
Snyder Lewis E.
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