Synchronized formation of starburst and poststarburst galaxies in merging clusters of galaxies - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




Synchronized formation of starburst and poststarburst galaxies in merging clusters of galaxies - Astrophysics > Cosmology and Nongalactic Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: We propose that synchronized triggering of star formation in gas-richgalaxies is possible during major mergers of cluster of galaxies, based on newnumerical simulations of the time evolution of the physical properties of theintracluster medium ICM during such a merger event. Our numerical simulationsshow that the external pressure of the ICM in which cluster member galaxies areembedded, can increase significantly during cluster merging. As such, efficientstar formation can be triggered in gas-rich members as a result of the strongcompression of their cold gas by the increased pressure. We also suggest thatthese star-forming galaxies can subsequently be transformed into poststarburstgalaxies, with their spatial distribution within the cluster being different tothe rest of its population. We discuss whether this possible merger-inducedenhancement in the number of star-forming and post-star-forming clustergalaxies is consistent with the observed evolution of galaxies in mergingclusters.



Author: Kenji Bekki, Matt S. Owers, Warrick J. Couch

Source: https://arxiv.org/







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