Star-forming galaxy models: Blending star formation into TREESPH

view Abstract Citations (183) References (72) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Star-forming Galaxy Models: Blending Star Formation into TREESPH Mihos, J. Christopher ; Hernquist, Lars 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. Publication: The Astrophysical Journal Pub Date: December 1994 DOI: 10.1086/175025 Bibcode: 1994ApJ...437..611M Keywords: Algorithms; Astronomical Models; Disk Galaxies; Galactic Evolution; Hydrodynamics; Many Body Problem; Ring Galaxies; Star Formation; Euler Equations Of Motion; Intergalactic Media; Interstellar Gas; Morphology; Numerical Analysis; Star Formation Rate; Astronomy; GALAXIES: EVOLUTION; GALAXIES: INDIVIDUAL ALPHANUMERIC: AM 0035-35; METHODS: NUMERICAL; STARS: FORMATION; GALAXIES: STELLAR CONTENT; HYDRODYNAMICS full text sources ADS | data products SIMBAD (1)