Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....75..170h&link_type=abstract
Astronomy and Astrophysics, vol. 75, no. 1-2, May 1979, p. 170-175. Deutsche Forschungsgemeinschaft
Astronomy and Astrophysics
Astrophysics
53
Galactic Structure, Giant Stars, Hydrogen Clouds, Neutral Gases, Stellar Envelopes, Interstellar Gas, Late Stars, Radio Telescopes, Stellar Luminosity, Stellar Mass, Velocity Distribution
Scientific paper
The distribution and velocity field of neutral hydrogen (H I) associated with the irregular galaxy IC 10 was studied using observations made with the 100-meter radio-telescope at Effelsberg. An enormous envelope extending to a diameter of about 10 minutes at a surface density of 3.6 times 10 to the 18th atoms per cubic centimeter was found. Assuming a distance of 1 Mpc, and low optical depth, the total H I mass of IC 10 is calculated to be 270 million solar masses. The global parameters such as total mass to luminosity, H I mass to luminosity, and relative H I content are within normal limits for late-type galaxies (Roberts, 1975). The velocity field gradient is differently oriented at small and large scale, and large line widths in the outer areas of the H I distribution are more pronounced than in the central area.
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