3D MODELLING OF FORMING GALAXIES; The History of Star Formation Activity

Details 3D MODELLING OF FORMING GALAXIES; The History of Star Formation Activity 3D MODELLING OF FORMING GALAXIES; The History of Star Formation Activity

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996ap%26ss.245...27b&link_type=abstract

Astrophysics and Space Science, Volume 245, Issue 1, pp.27-42

Astronomy and Astrophysics

Astrophysics

9

Scientific paper

Using a simplified approach we have followed the collapse and subsequent evolution of isolated protogalaxy perturbations over the cosmological timescale. As initial model perturbation we considered a constant-density homogeneous sphere of gas and dark matter in Hubble flow and in solid-body rotation (for set of spin parameters λ≈0.01, 0.04, 0.08). Its baryonic and nonbaryonic masses were taken to beM gas=1011 M &sun; andM DM=1012 M &sun; and initial radius was set equal toR=100 kpc. Using the 3D Smoothed Particle Hydrodynamics technique we modelled gasdynamic and thermal processes, star formation and supernova feedback. Our results show that modified star formation criterion, which takes care of chaotic motions and the time lag between initial development of suitable conditions for star formation and star formation itself, provides a realistic description of the process of galaxy formation and evolution over the cosmological timescale.

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