Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.5307l&link_type=abstract
American Astronomical Society, DPS meeting #39, #53.07; Bulletin of the American Astronomical Society, Vol. 39, p.521
Astronomy and Astrophysics
Astronomy
Scientific paper
We obtained 18cm OH spectra of comet C/2006 M4 SWAN between 27 October and 16 November, 2006, using the Arecibo Observatory 305m radiotelescope. Spectra were obtained with a beam resolution of 2.9 arcminutes and a velocity resolution of 69 m/s, on 27--29 October, 13 November, and 16 November, 2006. Multiple locations in the coma were observed each date, at the nucleus position and at six coma positions offset by 4.1 arcminutes in a hexagonal pattern on the sky. Coma outflow velocities were 1.2 -- 1.3 km/s from 27--29 October, decreasing to 1.0 km/s or less in mid-November. Collisional quenching is important for the October observations, in the inner 80,000 to 100,000 km of the coma, with gas production rates between 3--6 x 10^{29} mol/s. Some asymmetry is present in the spectra and in the relative strengths of the lines across the maps. We will present the spectra and compare them to Monte Carlo simulations for all map positions.
Howell Ellen S.
Lovell Amy Jean
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