Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasj...42..361s&link_type=abstract
Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 42, no. 3, 1990, p. 361-369.
Astronomy and Astrophysics
Astronomy
15
Irregular Galaxies, Magellanic Clouds, Molecular Clouds, Carbon Monoxide, Emission Spectra, Radio Astronomy
Scientific paper
(C-12)O (J = 1-0) observations of a Magellanic irregular galaxy, NGC 4449, were made, using the 45-m telescope of the Nobeyama Radio Observatory. CO emissions were detected within two regions of the central region of the galaxy. The molecular clouds in these regions form molecular cloud complexes with masses of the order of 10 to the 7th solar masses and sizes of several hundred pc. These sizes are comparable to those of bright H II regions in the galaxy, indicating that they are a characteristic scale of star-forming regions in this irregular galaxy. The molecular cloud complexes are compared with molecular clouds in the LMC and IC 10, the metallicities of which are similar to that of NGC 4449. The molecular cloud complexes in NGC 4449 fall around a regression line of CO luminosity vs width for the molecular clouds in the LMC and IC 10.
Ohta Kouji
Saitō Mamoru
Sasaki Minoru
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