IMPACTS OF A SUPERSONIC SHOCK FRONT ON STAR FORMATION IN THE BULLET CLUSTER

被引：23

作者：

Chung, Sun Mi ^{[1
]}

Gonzalez, Anthony H. ^{[1
]}

Clowe, Douglas ^{[2
]}

Zaritsky, Dennis ^{[3
]}

Markevitch, Maxim ^{[4
]}

Jones, Christine ^{[4
]}

机构：

[1] Univ Florida, Dept Astron, Gainesville, FL 32611 USA

[2] Ohio Univ, Dept Phys & Astron, Clippinger Lab 251B, Athens, OH 45701 USA

[3] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[4] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

来源：

ASTROPHYSICAL JOURNAL | 2009年 / 691卷 / 02期

关键词：

galaxies:; clusters:; individual; (1E0657-56; The Bullet Cluster); galaxies: evolution; POLYCYCLIC AROMATIC-HYDROCARBONS; NEED ULTRAVIOLET EXCITATION; SPITZER-SPACE-TELESCOPE; ACTIVE GALACTIC NUCLEI; RAM-PRESSURE; EMISSION FEATURES; VIRGO CLUSTER; DARK-MATTER; SPECTROSCOPIC SURVEY; SPIRAL GALAXIES;

D O I：

10.1088/0004-637X/691/2/963

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 mu m PAH feature is redshifted into the 8 mu m 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 2 sigma, 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.

引用

页码：963 / 970

页数：8

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