An H-alpha velocity field in the irregular galaxy IC 10

Details An H-alpha velocity field in the irregular galaxy IC 10 An H-alpha velocity field in the irregular galaxy IC 10

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44..593s&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 6, p. 593-600.

Astronomy and Astrophysics

Astronomy

24

Emission Spectra, H Alpha Line, Irregular Galaxies, Star Formation, Velocity Distribution, Astronomical Spectroscopy, Cosmic Gases

Scientific paper

Slit spectral observations of the irregular galaxy IC 10 were made for the H alpha emission line in the central 4.2 x 1.0 arcmin region covering most of the star-forming regions of the galaxy; the H-alpha velocities were obtained at about 500 points with a spatial resolution of about 3 arcsec. The H-alpha velocities are similar to the velocities of CO molecules, while on most of the observed H II regions the H-alpha velocities are redshifted by 5-10 km/s or so relative to the velocities of the surrounding H I gas. It is suggested from a simple hydrodynamical consideration that the star-forming clouds originated due to the collision of high-velocity infalling gas with the central H I disk.

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