Star Formation and the ISM in Four Dwarf Irregular Galaxies

Details Star Formation and the ISM in Four Dwarf Irregular Galaxies Star Formation and the ISM in Four Dwarf Irregular Galaxies

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...20310507y&link_type=abstract

American Astronomical Society Meeting 203, #105.07; Bulletin of the American Astronomical Society, Vol. 35, p.1375

Astronomy and Astrophysics

Astronomy

Scientific paper

We have used high sensitivity VLA observations of HI in four dwarf galaxies (UGCA 292, GR8, DDO 210, and DDO 216) to study interactions between star formation and the interstellar medium. UGCA 292, GR8, and DDO 210 are shown to contain both warm and cool or cold HI phases; the presence of the cold neutral medium is indicated by a low-dispersion (3--6 km/s) HI component or by the Gauss-Hermite shape parameter h4 > 0. Contrary to expectations, we find no trend between the incidence of the low-dispersion (colder) phase and the star formation rate in five dwarf galaxies. The colder HI phase may be a necessary ingredient for star formation, but it is clearly not sufficient. However, there is a global trend between the star formation rate of a galaxy andthe incidence of asymmetric HI profiles. This trend probably reflects kinetic energy input from young massive stars.

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