Velocity-resolved observations of water in comet Halley

Details Velocity-resolved observations of water in comet Halley Velocity-resolved observations of water in comet Halley

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...309l..95l&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 309, Oct. 15, 1986, p. L95-L99.

Astronomy and Astrophysics

Astrophysics

27

Astronomical Spectroscopy, Halley'S Comet, Infrared Spectra, Velocity Distribution, Water, Doppler Effect, Line Shape, Near Infrared Radiation

Scientific paper

High-resolution (λ/Δλ ≈ 3×105) near-infrared observations of H2O emission from comet Halley were acquired at the time of maximum postperihelion geocentric Doppler shift. The observed widths and absolute positions of the H2O line profiles reveal characteristics of the molecular velocity field in the coma. These results support H2O outflow from a Sun-lit hemisphere or the entire nucleus, but not from a single, narrow jet emanating from the nucleus. The measured pre- and postperihelion outflow velocities were 0.9±0.2 and 1.4±0.2 km s-1, respectively.

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