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1994ApJ...437..611M STAR-FORMING GALAXY MODELS: BLENDING STAR FORMATION INTO TREESPH J. CHRISTOPHER MIHOS AND LARS HERNQUIST Board of Studies in Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064; hos@lick.ucsc.edu; lars@lick.ucsc.edu Received 1994 March 10; accepted 1994 June 29 ABSTRACT We have incorporated star-formation algorithms into a hybrid N- body/smoothed particle hydrodynamics code (TREESPH) in order to describe the star forming properties of disk galaxies over timescales of a few billion years. The models employ a Schmidt law of index n ~ 1.5 to calculate star-formation rates, and explicitly include the energy and metallicity feedback into the ISM. Modeling the newly formed stellar population is achieved through the use of hybrid SPH/young star particles which gradually convert from gaseous to collisionless particles, avoiding the computational difficulties involved in creating new particles. The models are shown to reproduce well the star-forming properties of disk galaxies, such as the morphology, rate of star formation, and evolution of the global star-formation rate and disk gas content. As an example of the technique, we model an encounter between a disk galaxy and a small companion which gives rise to a ring galaxy reminiscent of the Cartwheel (AM 0035-35). The primary galaxy in this encounter experiences two phases of star forming activity: an initial period during the expansion of the ring, and a delayed phase as shocked material in the ring falls back into the central regions. Subject headings: galaxies: evolution - galaxies: individual (AM 0035-35) - galaxies: stellar content - hydrodynamics - methods: numerical - stars: formation
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