Mathematics – Probability
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.9708b&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #97.08; Bulletin of the American Astronomical Society, Vol. 24, p.1273
Mathematics
Probability
Scientific paper
We present one-zone and one dimensional models of galaxy evolution with and without multiphase ISM assumptions and stochastic star formation. Multiphase ISM characteristics are handled on a sub-grid scale under the assumption of pressure equilibrium. Star formation is limited to cold (T <= 100 K) regions of the ISM either according to a Schmidt star formation prescription or stochastically according to an assigned probability. We do several case studies at different probabilities. Energy balance of the ISM is maintained via the competition between supernovae, massive star winds, ionization by high energy photons and cosmic rays, dissipation due to cloud-cloud collisions and a composition dependent cooling function which includes molecular cooling. Local compositions are determined from the input of enriched ejecta from a variety of sources including supernovae of both Type I and II and AGB stars. Type Ia rates are calculated via the coalescing binary white dwarf scenario. Results of these models show that, while we confirm the presence of a long-lived extended halo (thick disk) phase found in previous studies with continuous star formation and energy deposition, stochastic star formation establishes more irregular gas, stellar, and composition distributions.
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