超音速激波阵面对子弹团恒星形成的影响
Impacts of a Supersonic Shock Front on Star Formation in the Bullet Cluster
摘要：
我们使用子弹星系团（1 E0657 -56），研究在星系团合并过程中，超音速气体（马赫数3）的冲压压力对星系团中恒星形成的影响程度。虽然冲压压力的影响已经研究了个别星系落入星系团，这个系统提供了一个独特的机会，调查戏剧性的合并事件对集群星系人口的影响。在这个分析中，我们使用{ \it Spitzer} IRAC数据来研究恒星的形成。在星团的红移处，6.2 $μ$ m PAH的特征被红移到8 $μ$ m波段，使得m $_{4.5}$ -m $_{8}$的颜色可以作为特定恒星形成率的代表。我们发现激波两侧的颜色分布相差不到2 $σ$，并得出结论：激波前沿的冲压压力对子弹星系团中星系团的恒星形成没有显著的直接影响。
英文摘要：
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 {\it Spitzer} IRAC data to study star formation. At the redshift of the cluster the 6.2 $μ$m PAH feature is redshifted into the 8 $μ$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 differ by less than 2$σ$, 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.
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