Aperture synthesis observations of molecular clouds in the dwarf irregular galaxy IC 10

Details Aperture synthesis observations of molecular clouds in the dwarf irregular galaxy IC 10 Aperture synthesis observations of molecular clouds in the dwarf irregular galaxy IC 10

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44..585o&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 6, p. 585-592.

Other

11

Carbon Monoxide, Dwarf Galaxies, Emission Spectra, Irregular Galaxies, Molecular Clouds, Synthetic Apertures, Spectral Line Width, Star Formation

Scientific paper

We carried out aperture synthesis observations of the dwarf irregular galaxy IC 10 with the Nobeyama Millimeter Array in the (C-12)O (J = 1-0) line. The observations have revealed the presence of three molecular clouds in the most active star-forming region; the line widths, masses, and deconvolved sizes of the molecular clouds are about 7 km/s, about 10 exp 5 solar masses, and 30-40 pc, respectively. The sizes and line widths of the molecular clouds are consistent with the size line width relation for giant molecular clouds in our Galaxy. The H II regions and other features showing star-formation activity are adjacent to these molecular clouds. All of these properties of the molecular clouds are very similar to those of the giant molecular clouds in our Galaxy, M31, and M33, indicating that giant molecular clouds are formed in the dwarf irregular galaxy without any density wave. The results of CO and optical observations suggest that the molecular clouds are receding from the galactic plane of IC 10 with velocities of a few km/s.

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