Arecibo observations of the 18 cm OH lines of six comets

Details Arecibo observations of the 18 cm OH lines of six comets Arecibo observations of the 18 cm OH lines of six comets

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.500..681l&link_type=abstract

In: Proceedings of Asteroids, Comets, Meteors - ACM 2002. International Conference, 29 July - 2 August 2002, Berlin, Germany. Ed

Physics

2

Comets: Oh Lines

Scientific paper

Using the 300m Arecibo telescope, we have obtained observations of 18cm OH emission in six comets since May 2000: C/1999 S4 LINEAR, C/1999 T1 McNaught-Hartley, C/2001 A2-B LINEAR, C/2002 C1 Ikeya-Zhang, C/2000 WM1 LINEAR, and C/2002 F1 Utsunomiya. These comets are detected with production rates between 3×1027 and 4×1029mol/s. We find strong OH emission from C/2001 A2-B in July, 2001, which was likely enhanced by the breakup of the nucleus a few weeks prior to the observations. Asymmetric OH spectra may thus occur either as a result of physical jet structures or of differing line excitation across the coma, or both. Both comets C/2000 WM1 and C/Ikeya-Zhang show unusual line shapes, which indicate complex outflow behavior and excitation characteristics.

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