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ALMA Deep Field in SSA22: Source Catalog and Number Counts

机译：SSA22中的ALMA深场：源目录和数量计数

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We present results from a deep 2' × 3' (comoving scale of 3.7 Mpc × 5.5 Mpc at z = 3) survey at 1.1 mm, taken with the Atacama Large Millimeter/submillimeter Array (ALMA) in the SSA22 field. We observe the core region of a z = 3.09 protocluster, achieving a typical rms sensitivity of 60 μJy beam^(−1) at a spatial resolution of 0"7. We detect 18 robust ALMA sources at a signal-to-noise ratio (S/N) > 5. Comparison between the ALMA map and a 1.1 mm map, taken with the AzTEC camera on the Atacama Submillimeter Telescope Experiment (ASTE), indicates that three submillimeter sources discovered by the AzTEC/ASTE survey are resolved into eight individual submillimeter galaxies (SMGs) by ALMA. At least 10 of our 18 ALMA SMGs have spectroscopic redshifts of z sime 3.09, placing them in the protocluster. This shows that a number of dusty starburst galaxies are forming simultaneously in the core of the protocluster. The nine brightest ALMA SMGs with S/N > 10 have a median intrinsic angular size of 0."32_(-0.06)^(+0.13)(2.4_(-0.4^(+1.0 physical kpc at z = 3.09), which is consistent with previous size measurements of SMGs in other fields. As expected, the source counts show a possible excess compared to the counts in the general fields at S_(1.1mm) ≥ 1.0 mJy, due to the protocluster. Our contiguous mm mapping highlights the importance of large-scale structures on the formation of dusty starburst galaxies.
机译：我们介绍了在SSA22场中使用Atacama大毫米/亚毫米阵列（ALMA）进行的1.1mm深度2'×3'（在z = 3时，转换范围为3.7 Mpc×5.5 Mpc）的结果。我们观察到az = 3.09原簇的核心区域，在空间分辨率为0“ 7的情况下，典型的均方根灵敏度为60μJy光束^（-1）。我们以信噪比（S / N）> 5.在阿塔卡马亚毫米望远镜实验（ASTE）上使用AzTEC相机拍摄的ALMA地图和1.1 mm地图之间的比较表明，通过AzTEC / ASTE测量发现的三个亚毫米源被分解为八个单独的亚毫米ALMA的18个星系（SMG）中，至少有10个具有z sime 3.09的光谱红移，并将它们置于原团簇中，这表明许多尘埃爆炸星系同时在原团簇的核心中形成。 S / N> 10的最亮ALMA SMG的中位固有角大小为0。“ 32 _（-0.06）^（+ 0.13）（2.4 _（-0.4 ^（+ 1.0物理kpc，z = 3.09），这是一致的与先前在其他领域中对SMG的尺寸测量一样，如预期的那样，源计数显示出由于存在原始簇，因此xcess与S_（1.1mm）≥1.0 mJy的常规字段中的计数相比。我们连续的毫米映射突出了大型结构对尘土飞扬星系星系形成的重要性。

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