Radio detection of ammonia in comet Hale-Bopp.

Details Radio detection of ammonia in comet Hale-Bopp. Radio detection of ammonia in comet Hale-Bopp.

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...325l...5b&link_type=abstract

Astronomy and Astrophysics, v.325, p.L5-L8

Astronomy and Astrophysics

Astrophysics

34

Radio Line Emission, Comets, Comet Hale-Bopp

Scientific paper

Radio emission from ammonia, a suspected parent molecule in comets, was detected from comet Hale-Bopp near its perihelion passage with the 100-m Effelsberg Radio Telescope. Signals from the five lowest metastable inversion transitions of NH_3_ were obtained to derive a rotational temperature of 104+/-30K, assumed to be representative of the kinetic temperature in the comet's inner coma (R<5000km). The ammonia production rate at perihelion is calculated from these observations to be 6.6+/-1.3x10^28^s^-1^ (almost two tons of ammonia per second). Compared with independently determined water production rates near perihelion, the implied ammonia abundance ratio to water is in the range 1.0-1.8%.

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