Search for the radio lines of ammonia in comets

Details Search for the radio lines of ammonia in comets Search for the radio lines of ammonia in comets

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.500..697b&link_type=abstract

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

Physics

5

Comets: Comet C/2001 A2 (Linear), Comet C/2002 C1 (Ikeya-Zhang), Radio Line Emission

Scientific paper

Radio observations of Comets C/2001 A2 (LINEAR) and C/2002 C1 (Ikeya-Zhang) in the ammonia inversion lines were performed during their respective close approaches to Earth. None of the four lowest energy metastable lines (J,K=J, J=1,4), could be detected in Comet LINEAR, for which we derive a significant upper bound on the production rate of Q(NH3) < 1.4×1026s-1. There are indications of a marginal detection (~2σ) in Comet Ikeya-Zhang. The maximum possible integrated intensity of the four observed lines converts to an upper limit on the ammonia production rate of Q(NH3) < 3.4×1026s-1. These results imply remarkably low ammonia-to-water ratios of roughly 0.2-0.3% in both comets.

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