Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...343..644v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 343, Aug. 15, 1989, p. 644-658. Research supported by Texas Advanced Resear
Astronomy and Astrophysics
Astrophysics
29
Galactic Evolution, Interacting Galaxies, Star Formation, Density Distribution, Intergalactic Media
Scientific paper
The behavior of model galaxies as cloud fluids that increase their density by some mechanism corresponding to processes that are sources of internal energy for galactic gas. The models typically evolve in three major phases: (1) a density-increasing phase during which the energy injected by the external mechanism causes the clouds to undergo shredding collisions, a decrease in the mean cloud mass, and a corresponding decrease of the star formation rate; (2) a 'recovery' period after the turnoff of the external mechanism, during which the small clouds produced by shredding in the previous phase recoalesce until they reach the star-forming mass; and (3) a final stage in which the system either returns to a quasi-equilibrium state near the initial one or undergoes bursts of star formation, depending on whether the net increase in density was large enough to drive the system past the threshold for bursting behavior.
Scalo John M.
Vazquez Enrique C.
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