Supershells: origin,evolution and fragmentation |
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| Institution: | 1. Institut d''Astrophysique de Paris, 98bis Bd. Arago, 75014 Paris, France;1. Blackett Laboratory, Imperial College, London SW7 2BZ, UK;2. lsaac Newton Group, Apartado 321, 38700 Santa Cruz de La Palma, The Canary Islands, Spain;1. NAOJ, Mitaka, Tokyo, 181-8588 Japan;2. ISAS, Sagamihara, Kanagawa, 229-8510 Japan |
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| Abstract: | The origin of HI shells in the Milky Way and nearby galaxies may be connected to the energy released by young and massive OB stars, supernova or hypernova explosions, or to the energy inputs related to gamma ray bursts. We describe the evolution of shells in spiral and dwarf galaxies and distinguish between different origins. We also discuss the conditions, when they fragment and trigger star formation. |
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