Other
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...291...80w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 291, April 1, 1985, p. 80-87.
Other
41
Elliptical Galaxies, Galactic Structure, Intergalactic Media, Stellar Envelopes, Detonation Waves, Galactic Evolution, Galactic Nuclei, Interstellar Gas, Radiative Heat Transfer, Stellar Evolution, Stellar Motions, Supernovae
Scientific paper
The existence of stellar shells at large distances from isolated elliptical galaxies is explained in terms of a blast wave associated with an active nucleus phase early in the history of the galaxy. The blast wave sweeps the initial interstellar medium out of the galaxy into an expanding shell which radiatively cools behind its leading shock front. Cooling of the shell following turnoff of the nucleus activity, which keeps the shell photoionized, leads to a brief epoch of star formation which is terminated by heating of the shell from supernovae and UV radiation from massive stars. The stars so formed follow similar, highly radial, bound orbits, moving in phase with each other and spending much of their time near apogalacteum, thus taking on the appearance of a shell. Multiple shells may be produced when conditions allow repeated episodes of shell cooling and supernovae heating to occur in the blast wave.
Christiansen Wayne A.
Williams Robert E.
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