Clues to galaxy activity from rich cluster simulations

Details Clues to galaxy activity from rich cluster simulations Clues to galaxy activity from rich cluster simulations

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3084..343e&link_type=abstract

In NASA, Ames Research Center, The Interstellar Medium in External Galaxies: Summaries of Contributed Papers p 343-345 (SEE N91-

Physics

Active Galaxies, Galactic Clusters, Galaxies, Intergalactic Media, Red Shift, Simulation, Star Formation, Static Pressure, Hypotheses, Populations, Three Dimensional Models

Scientific paper

New simulations of rich cluster evolution are used to evaluate the first infall hypothesis of Gunn and Dressler - the idea that the enhanced fraction of active galaxies seen in high redshift clusters is due to a one-time burst of star formation triggered by the rapid rise in external pressure as a galaxy plows into the hot intracluster medium (ICM). Using three-dimensional simulations which contain both baryonic gas and collisionless dark material, local static pressure histories for test orbits of galaxies are generated and a simple trigger threshold based on dP/dt/PISM is applied to define an active fraction of the population. The results lend qualitative and quantitative support to the first infall interpretation.

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