An H I superbubble in the spiral galaxy M 101

Details An H I superbubble in the spiral galaxy M 101 An H I superbubble in the spiral galaxy M 101

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...244l..29k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 1, April 1991, p. L29-L32.

Astronomy and Astrophysics

Astronomy

73

Galactic Structure, H Ii Regions, Interstellar Matter, Radio Astronomy, Spiral Galaxies, Emission Spectra, Gray Scale, Hydrogen, Star Formation, Stellar Winds, Supernovae

Scientific paper

A remarkable H I superbubble, 1.5 kpc in size with a mass of 30 million solar, an expansion velocity of 50 km/sec and probably accelerating into the halo, has been found in the nearby spiral galaxy M 101. This is the first clear case of an expanding H I shell associated with a hole in the H I layer. It indicates, beyond any doubt, that this hole is related to energetic phenomena in the disk of the galaxy. The kinetic energy of the H I shell is a few 10 to the 53rd erg, which is the equivalent of at least one thousand supernovae.

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