abstract
About 30 hours after the DI impact event, comet 9P/Tempel 1 has been observed with the 32\ m dish of Medicina observatory (Bologna, Italy) to search for the NH$_3$ inversion transitions in the region around 24 GHz. The results show the presence of a line with S/N of about 6 and a FWHM equal to 1.35 km/s close to the NH$_3$(1,1) frequency. The cometary origin of the line seems sure, because the search for possible background sources of such a emission, performed a few days later along the same comet path, did not show any line at that frequency. Its identification is however dubious because of its too high outflow projected velocity and the too high ammonia production necessary to fit the line intensity. The frequency of the line is also close to a transition of methyl formate, a species already observed in comet Hale-Bopp and in hot cores. The outflow projected velocity would be smaller than in the case of the ammonia, but its abundance would be too high as well.
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Tozzi, G.P., Palagi, F., Codella, C., Poppi, S., Crovisier, J. (2009). Search for Ammonia Radio Emission in Comet 9P/Tempel~1 after the Deep Impact Event. In: Käufl, H., Sterken, C. (eds) Deep Impact as a World Observatory Event: Synergies in Space, Time, and Wavelength. Eso Astrophysics Symposia. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-76959-0_37
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DOI: https://doi.org/10.1007/978-3-540-76959-0_37
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