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H I shells and supershells
Heiles, C.
AA(California, University, Berkeley, Calif.)
Astrophysical Journal, Part 1, vol. 229, Apr. 15, 1979, p. 533-537, 539-544. NSF-supported research. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Centimeter Waves, Hydrogen Clouds, Interstellar Matter, Radio Sources (Astronomy), Angular Resolution, Astronomical Photography, Supernova Remnants
Bibliographic Code:


Photographic representations of H I antenna temperatures in narrow velocity intervals vs galactic longitude and latitude are presented for velocities of -143 to +141 km/s, longitudes of 10 to 250 deg, and latitudes of -10 to +10 deg. A multitude of structure, much of which is filamentary, is observed in the photographs. Forty-six stationary H I shells and 17 expanding H I shells are identified, and properties of these shells are tabulated. Distances to the shells and the velocity dispersion are estimated, along with the hydrogen content of the H I shells and the energies of the expanding shells. The results are compared with previous studies, the numbers and production rates of H I shells are considered, and explanations are offered for the observed shapes of the shells. Eleven 'supershells' are identified, and possible production agents for these shells are examined.

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