NGC 206, a hole in M31

Details NGC 206, a hole in M31 NGC 206, a hole in M31

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....95l...1b&link_type=abstract

Astronomy and Astrophysics, vol. 95, no. 1, Feb. 1981, p. L1-L4. Research supported by the Netherlands Foundation for Astronomi

Astronomy and Astrophysics

Astronomy

54

Andromeda Galaxy, B Stars, Galactic Structure, Hydrogen Clouds, Interstellar Gas, O Stars, H Alpha Line, Magellanic Clouds, Radio Astronomy, Radio Emission

Scientific paper

New high resolution 21 cm line observations of M31 show that the interstellar medium of this galaxy contains numerous holes in the H I distribution, some of which are clearly correlated with OB-associations. These holes appear to belong to the same class of objects as the super shells and giant bubbles in the Galaxy and the Magellanic Clouds. NGC 206, a 20-million yr old rich OB-association, coincident with a large 400 x 800 pc hole is studied in detail. Here, 2-million solar masses of H I is missing. This is partly ionized and partly blown away. The observed H-alpha emission is in agreement with the number of OB-stars found.

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