Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.0604l&link_type=abstract
American Astronomical Society, DPS meeting #38, #06.04; Bulletin of the American Astronomical Society, Vol. 38, p.490
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We have obtained 18cm OH spectra of fragments of comet 73P/Schwassmann-Wachmann 3 during April and May of 2006. Spectra of fragments B and C were obtained at a spatial resolution of 200 arcsec using the 300m Arecibo telescope and at 442 arcsec using the 100m Green Bank Telescope (GBT). Fragment G was observed at Arecibo, but was not detected. Observations were carried out simultaneously with both telescopes on May 18-20, 2006. During that time, hexagonal maps were made sampling the coma at 4, 8, and 16 arcmin away from the nucleus in the plane of the sky. Preliminary results are consistent with an overall outflow velocity of 0.7 km/s, and no significant collisional quenching of the OH lines. Observed line strengths were strong and very similar for the two fragments, in spite of the much smaller size of fragment B (from coordinated radar observations at Arecibo). The GBT observations spanned nearly 12 hours each day, and permitted at least four complete mapping cycles on each fragment. We will present a comparison of the two detected fragments in terms of surface activity levels, extent of OH emission, the degree of collisional quenching, if any, and variations in time.
Butler Bryan Jay
Howell Ellen S.
Lovell Amy Jean
Marine H.
Schloerb Peter F.
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