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Title:
Impacts of a Supersonic Shock Front on Star Formation in the Bullet Cluster
Authors:
Chung, Sun Mi; Gonzalez, Anthony H.; Clowe, Douglas; Zaritsky, Dennis; Markevitch, Maxim; Jones, Christine
Affiliation:
AA(Department of Astronomy, University of Florida, Gainesville, FL 32611-2055, USA ), AB(Department of Astronomy, University of Florida, Gainesville, FL 32611-2055, USA ), AC(Department of Physics and Astronomy, Ohio University, 251B Clippinger Lab, Athens, OH 45701, USA ), AD(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA ), AE(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA), AF(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA)
Publication:
The Astrophysical Journal, Volume 691, Issue 2, pp. 963-970 (2009). (ApJ Homepage)
Publication Date:
02/2009
Origin:
IOP
ApJ Keywords:
galaxies: clusters: individual: 1E0657-56 The Bullet Cluster, galaxies: evolution
DOI:
10.1088/0004-637X/691/2/963
Bibliographic Code:
2009ApJ...691..963C

Abstract

We use the Bullet Cluster (1E0657-56) to investigate the extent to which star formation in cluster galaxies is influenced by ram pressure from supersonic gas (Mach 3) during a cluster merger. While the effects of ram pressure have been studied for individual galaxies infalling into galaxy clusters, this system provides a unique opportunity to investigate the impact of dramatic merger events on the cluster galaxy population. In this analysis, we use Spitzer IRAC data to study star formation. At the redshift of the cluster, the 6.2 μm PAH feature is redshifted into the 8 μm band, enabling use of the m 4.5 - m 8 color as a proxy for specific star formation rate. We find that the color distribution on the two sides of the shock differs by less than 2σ, and conclude that ram pressure from the shock front has no dramatic, immediate impact on the star formation of cluster galaxies in the Bullet Cluster.

This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.

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