Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.156..183b&link_type=abstract
(Instituto de Astrofisica de Canarias and Comision Interministerial de Ciencia y Tecnologia, Summer School on Evolutionary Pheno
Astronomy and Astrophysics
Astrophysics
6
Dwarf Galaxies, H I Regions, H Ii Regions, Markarian Galaxies, Star Formation, Brightness Distribution, Dark Matter, H Alpha Line, Spectral Emission, Velocity Distribution
Scientific paper
High-resolution observations of the star forming dwarf galaxies Haro 21 and Markarian 314 are presented and are compared with a set of narrow band (H-alpha) CCD images. The H I system related to Haro 21 measures about 12 kpc in diameter and is much more extended than the optical emission. The optical light follows that of an exponential disk and has a scale length of only 600 pc. The H I distribution shows a lack of neutral gas near its center where most of the H-alpha emission is found. The velocity field is regular and shows the characteristics of a disk in differential rotation. The rotation curve is rising out to the last measured point and the total mass is estimated to be about 1.5 x 10 to the 10th solar masses. This implies that Haro 21 is a galaxy which is dominated by dark matter.
Brinks Elias
Klein Ulrich
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