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

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248p...8e&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Jan. 15, 1991, p. 8P-10P. Research supported by Mi

Astronomy and Astrophysics

Astronomy

58

Active Galaxies, Galactic Clusters, Red Shift, Gas Dynamics, Interstellar Gas, Star Formation, Three Dimensional Models

Scientific paper

New simulations of rich cluster evolution are used to evaluate the 'first infall' hypothesis of the Butcher-Oemler effect (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 ploughs into the hot intracluster medium. 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 is applied to define an 'active' fraction of the population. The results lend firm qualitative and some quantitative support to the first infall interpretation.

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