Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/88779

Title

Synchronized formation of starburst and post-starburst galaxies in merging clusters of galaxies

Author(s)

Bekki, Kenji;  Owers, Matt S.;  Couch, Warrick J.

Abstract

We propose that synchronized triggering of star formation in gas-rich galaxies is possible during major mergers of cluster of galaxies, based on new numerical simulations of the time evolution of the physical properties of the intracluster medium (ICM) during such a merger event. Our numerical simulations show that the external pressure of the ICM, in which cluster member galaxies are embedded, can increase significantly during cluster merging. As such, efficient star formation can be triggered in gas-rich members as a result of the strong compression of their cold gas by the increased pressure. We also suggest that these star-forming galaxies can subsequently be transformed into post-starburst galaxies, with their spatial distribution within the cluster being different than that of the rest of the population. We discuss whether this possible merger-induced enhancement in the number of star-forming and post-star-forming cluster galaxies is consistent with the observed evolution of galaxies in merging clusters.

Publication type

Journal article

Research centre

Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing

Source

Astrophysical Journal Letters, Vol. 718, no. 1 (Jul 2010), pp. L27-L31

Publication year

2010

Keyword(s)

Dynamics;  Galaxy evolution;  Galaxy structure;  Haloes;  Kinematics

Publisher

Institute of Physics Publishing

ISSN

2041-8205

Publisher URL

http://dx.doi.org/10.1088/2041-8205/718/1/L27

Copyright

Copyright © 2010 The American Astronomical Society.

Peer reviewed