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arXiv 1607.08833astro-ph.COastro-ph.GA
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5弧秒处的Sunyaev-Zel'dovich效应:RXJ1347 .5-1145由ALMA成像

The Sunyaev-Zel'dovich Effect at Five Arc-seconds: RXJ1347.5-1145 Imaged by ALMA

T. Kitayama, S. Ueda, S. Takakuwa, T. Tsutsumi, E. Komatsu, T. Akahori, D. Iono, T. Izumi, R. Kawabe, K. Kohno, H. Matsuo, N. Ota, Y. Suto, M. Takizawa, K. Yoshikawa

摘要:

我们提出的热Sunyaev-Zel'dovich效应(SZE)的阿塔卡马大型毫米/亚毫米阵列(ALMA)获得的第一个图像。结合波段3中的7米和12米阵列,我们创建了一个朝向星系团RXJ1347.5-1145的SZE地图,分辨率为5弧秒(对应于20 kpc/h的物理大小),这是迄今为止成像SZE所达到的最高角度和物理空间分辨率,同时保留了40弧秒的扩展信号。图像的1-sigma统计灵敏度为0.017 mJy/束或0.12 mK_CMB(5弧秒半高全宽)。的SZE图像显示出良好的协议与独立重建的X射线数据的电子压力图,并提供了一个新的探测小尺度结构的集群内介质。我们的研究结果表明,ALMA是一个强大的仪器成像的SZE在紧凑的星系团前所未有的角分辨率和灵敏度。作为ALMA探测SZE的第一份报告,我们提出了详细的分析程序,包括对丢失的通量的校正,为分析和解释未来的SZE图像ALMA提供指导方法。

英文摘要:

We present the first image of the thermal Sunyaev-Zel'dovich effect (SZE) obtained by the Atacama Large Millimeter/submillimeter Array (ALMA). Combining 7-m and 12-m arrays in Band 3, we create an SZE map toward a galaxy cluster RXJ1347.5-1145 with 5 arc-second resolution (corresponding to the physical size of 20 kpc/h), the highest angular and physical spatial resolutions achieved to date for imaging the SZE, while retaining extended signals out to 40 arc-seconds. The 1-sigma statistical sensitivity of the image is 0.017 mJy/beam or 0.12 mK_CMB at the 5 arc-second full width at half maximum. The SZE image shows a good agreement with an electron pressure map reconstructed independently from the X-ray data and offers a new probe of the small-scale structure of the intracluster medium. Our results demonstrate that ALMA is a powerful instrument for imaging the SZE in compact galaxy clusters with unprecedented angular resolution and sensitivity. As the first report on the detection of the SZE by ALMA, we present detailed analysis procedures including corrections for the missing flux, to provide guiding methods for analyzing and interpreting future SZE images by ALMA.

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