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Title:
HCN in the center of the galaxy IC 342
Authors:
Downes, D.; Radford, S. J. E.; Guilloteau, S.; Guelin, M.; Greve, A.; Morris, D.
Affiliation:
AA(Inst. de Radioastronomie Millimetrique, Saint-Martin-d'Heres, France), AB(Inst. de Radioastronomie Millimetrique, Saint-Martin-d'Heres, France), AC(Inst. de Radioastronomie Millimetrique, Saint-Martin-d'Heres, France), AD(Inst. de Radioastronomie Millimetrique, Saint-Martin-d'Heres, France), AE(Inst. de Radioastronomie Millimetrique, Saint-Martin-d'Heres, France), AF(Inst. de Radioastronomie Millimetrique, Saint-Martin-d'Heres, France)
Publication:
Astronomy and Astrophysics (ISSN 0004-6361), vol. 262, no. 2, p. 424-432. (A&A Homepage)
Publication Date:
09/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
CARBON MONOXIDE, GALACTIC NUCLEI, HYDROCYANIC ACID, INTERSTELLAR MATTER, MOLECULAR SPECTRA, RADIO SPECTRA, GAS DYNAMICS, LINE SPECTRA, RADIO ASTRONOMY
Bibliographic Code:
1992A&A...262..424D

Abstract

HCN(1-0) line emission from the center of the galaxy IC 342 was mapped with the IRAM interferometer at 2.7-arcsec resolution. Comparison of this HCN map with other molecular line maps of similar resolution is used to determine molecular line ratios on a scale of 20 pc in a massive galaxy other than the Milky Way. In the five main clouds within 100 pc of IC 342's nucleus, the CO(1-0)/HCN(1-0) intensity ratio is 7 +/- 2 and is at least twice as high farther out in the minispiral arms. Comparison with other maps shows the 3.4-mm continuum radiation near the center of the galaxy at a level of 27 mJy is free-free emission rather than thermal radiation by dust. Since the free-free continuum is associated with only one of the dense molecular clouds traced by the HCN, most of the molecular clouds in the center of IC 342 do not exhibit any massive star formation activity.

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