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K-band Radio Observations of Comet Hale-Bopp: Detections of Ammonia and (Possibly) Water |
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| Authors: | Bird M K Janardhan P Wilson T L Huchtmeier W K Gensheimer P Lemme C |
| Institution: | 1.Radioastronomisches Institut, Universit?t Bonn, Auf dem Hügel 71, 53121, Bonn, Germany. E-mail ;2.Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany ;3.Institut für Planetenerkundung, DLR, Rudower Chaussee 5, 12489, Berlin, Germany ; |
| Abstract: | K-band radio observations of comet Hale-Bopp (C/1995 O1) were conducted in March/April 1997 at the 100-m Telescope of the Max-Planck-Institut für Radioastronomie. Emission was firmly detected from the five lowest metastable (J = K)inversion transitions of ammonia. Assuming a thermal distribution for the metastable states of NH3, we derive a rotational temperature of 104 ± 30 K and an ammonia production rate at perihelion of6.6 ± 1.3 × 1028 s-1.The updated ammonia-to-water abundance ratio is found to be of the order of 1.0%. We also report a marginal detection of the 616–523transition line of water at λ = 1.35 cm. This revised version was published online in July 2006 with corrections to the Cover Date. |
| Keywords: | Radio line emission comets comet Hale-Bopp |
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