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Astron. Astrophys. 354, 1036-1040 (2000)

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Probing the properties of methyl cyanide sources

S.V. Kalenskii 1, V.G. Promislov 1, A.V. AlakozA. Winnberg 1,3,2 and L.E.B. Johansson 2

1 Astro Space Center of Lebedev Physical Institute, Profsoyuznaya 84/32, 117810 Moscow, Russia (kalensky@dpc.asc.rssi.ru; vitaly@diogen.asc.rssi.ru; alakoz@dpc.asc.rssi.ru)
2 Onsala Space Observatory, 439 92 Onsala, Sweden (anders@oso.chalmers.se; leb@oso.chalmers.se)
3 Moscow State University, Physical Faculty, Astronomical Department, Universitetskii pr. 13, 119899 Moscow, Russia

Received 18 September 1998 / Accepted 22 December 1999

Abstract

A survey of 27 galactic star-forming regions in the [FORMULA] and [FORMULA] CH3CN lines at 110 and 92 GHz, respectively, was made. Twenty-five sources were detected at 110 GHz and nineteen at 92 GHz. The strongest CH3CN emission arise in hot cores in the regions of massive star formation. CH3CN abundance in these objects is increased up to [FORMULA] or larger. Weaker CH3CN lines were found in a number of sources. They may arise in warm (30-50 K) clouds.

Key words: ISM: clouds – ISM: molecules – ISM: abundances – radio lines: ISM

Send offprint requests to: A. Winnberg

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© European Southern Observatory (ESO) 2000

Online publication: February 25, 2000
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