子弹星系团（1 E0657 -56）之外的一个明亮的，尘埃遮蔽的，毫米选择的星系
A bright, dust-obscured, millimeter-selected galaxy beyond the Bullet Cluster (1E0657-56)
摘要：
10米阿塔卡马亚毫米望远镜实验（ASTE）上的毫米波长相机AzTEC对1 E0657 -56（“子弹星团”）进行了1.1毫米深连续观测，揭示了一个非常明亮的（S $_{\rm{1.1mm}}=15.9$ mJy）未分辨的源。这个来源，MMJ 065837 -5557.0，位于接近最大密度的基础质量分布，对较大的两个相互作用的集群跟踪的弱透镜分析的Clowe等。使用光学-红外颜色，我们认为MMJ 065837 -5557.0位于红移$z = 2.7 \pm 0.2$。子弹星系团的一个透镜衍生的质量模型显示了在阿兹台克源的几个弧秒内放大的临界线（焦散），足以将阿兹台克星系的固有毫米波长通量放大$\gg 20$倍。在扣除了Sunyaev-Zel'dovich效应导致的前景星团1.1毫米的辐射，并对放大率进行了修正后，MMJ 065837 -5557.0的静止帧远红外光度为$\le 10^{12} \rm L_{\odot}$，是一个亮红外星系（LIRG）的特征。我们探索各种方案来解释潜在的光学和IR对应物之间的颜色，形态和位置偏移，以及它们与MMJ 065837 -5557.0的关系。在更高分辨率和更灵敏的（亚）毫米观测可用之前，对接近大质量透镜星系团焦散线的背景星系的探测提供了研究这种本质上微弱的毫米星系群的唯一机会。
英文摘要：
Deep 1.1 mm continuum observations of 1E0657-56 (the "Bullet Cluster") taken with the millimeter-wavelength camera AzTEC on the 10-m Atacama Submillimeter Telescope Experiment (ASTE), have revealed an extremely bright (S$_{\rm{1.1mm}}=15.9$ mJy) unresolved source. This source, MMJ065837-5557.0, lies close to a maximum in the density of underlying mass-distribution, towards the larger of the two interacting clusters as traced by the weak-lensing analysis of Clowe et al. 2006. Using optical--IR colours we argue that MMJ065837-5557.0 lies at a redshift of $z = 2.7 \pm 0.2$. A lensing-derived mass-model for the Bullet Cluster shows a critical-line (caustic) of magnification within a few arcsecs of the AzTEC source, sufficient to amplify the intrinsic millimeter-wavelength flux of the AzTEC galaxy by a factor of $\gg 20$. After subtraction of the foreground cluster emission at 1.1mm due to the Sunyaev-Zel'dovich effect, and correcting for the magnification, the rest-frame FIR luminosity of MMJ065837-5557.0 is $\le 10^{12} \rm L_{\odot}$, characteristic of a luminous infrared galaxy (LIRG). We explore various scenarios to explain the colors, morphologies and positional offsets between the potential optical and IR counterparts, and their relationship with MMJ065837-5557.0. Until higher-resolution and more sensitive (sub)millimeter observations are available, the detection of background galaxies close to the caustics of massive lensing clusters offers the only opportunity to study this intrinsically faint millimeter-galaxy population.
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