Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...150l..25h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 150, no. 2, Sept. 1985, p. L25-L27.
Astronomy and Astrophysics
Astrophysics
28
Astronomical Spectroscopy, Carbon Compounds, Interstellar Gas, Molecular Gases, Carbon Monoxide, Cyanoacetylene, Electron Transitions, Galactic Nuclei, Irregular Galaxies, Line Spectra, Milky Way Galaxy, Starburst Galaxies, Sulfides
Scientific paper
The J = 2-1 transition of CS has been detected in M82 and in IC342, suggesting the presence of large amounts of high density gas (n greater than 1000/cu cm). The integrated intensities are 1.51 km/s and 0.44 km/s for M82 and IC342, respectively. The probable location of the peak of the CS emission relative to the nucleus of IC342 is discussed. The molecular line intensity ratios in M82 and IC342 are similar to those found in the Galactic center region and in local molecular cloud cores. They are, however, different from the line intensity ratios in the GMCs of the Galactic disk. The larger integrated intensity of M82 is consistent with the occurrence of a nuclear starburst in this galaxy. Searching in IC342 for the J = 11-10 transition of HC3N leads to the discovery of an upper limit 3 times below the intensity of the J = 2-1 CS line.
Bally John
Henkel Carsten
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