标题： SMA观测GOODS 850-11和GOODS 850-13 - 干涉仪解析的多个亚毫米波源的首批例子 显示英文标题

标题： SMAObservations of GOODS 850-11 and GOODS 850-13 - First Examples of Multiple Submillimeter Sources Resolved by an Interferometer

摘要： 我们对两个亚毫米波星系（SMGs）：GOODS 850-11 和 GOODS 850-13 进行了极其敏感的亚毫米阵列（SMA）340 GHz连续谱成像。 观测达到了亚毫焦耳每平方秒的均方根灵敏度，并且有趣的是，将这两个源分解为多个物理上无关的SMGs。 GOODS 850-11 在不同的红移下被分解为两个源。 GOODS 850-13 被分解为三个源，其中两个具有不同的光谱红移，一个仅具有光度红移。 所有SMA源的流量在3-5毫焦耳每平方秒范围内，并且都在1.4 GHz处被检测到。 其中三个被钱德拉探测到，其中一个是一个之前未知的X射线SMG。 这是首次将单天线SMGs分解为多个不相关的源，也是SMA首次发现新的SMGs。 我们的结果表明，在亚毫米波以外的任何波长对SMGs的识别都可能产生误导，因为这种识别通常只捕捉到真实对应体中的一个。 通过模拟我们SCUBA和SMA观测的模拟，我们发现SMA调查中检测到的三重系统数量远高于目前最确定的数目统计所预期的数量。 我们初步将其归因于聚类。 我们还预测，ALMA将发现超过5毫焦耳每平方秒的850微米SCUBA源中有约1/3是多重系统。 基于我们的SMA观测和模拟，我们建议应使用灵敏的干涉测量观测对现有的大样本SMGs进行成像，即使这些SMGs之前被认为已被可靠地识别。 显示英文摘要

摘要： We carried out extremely sensitive Submillimeter Array (SMA) 340 GHz continuum imaging on two submillimeter galaxies (SMGs): GOODS 850-11 and GOODS 850-13. The observations reach sub-mJy rms sensitivities and, interestingly, resolve both sources into multiple, physically unrelated SMGs. GOODS 850-11 is resolved into two sources at different redshifts. GOODS 850-13 is resolved into three sources, two with different spectroscopic redshifts and one only with a photometric redshift. All the SMA sources have fluxes in the 3-5 mJy range and all are detected at 1.4 GHz. Three of them are detected by Chandra, and one is a previously unknown X-ray SMG. This is the first time that single-dish SMGs are resolved into multiple unrelated sources and also the first time that the SMA has discovered new SMGs. Our results show that identifications of SMGs at any wavelengths other than the submillimeter itself can be misleading, since such identifications usually only pick up one of the real counterparts. Using simulations that mimic our SCUBA and SMA observations, we find that the number of triple systems detected in our SMA survey is much higher than that expected from the current best-determined number counts. We tentatively attribute this to clustering. We also predict that ALMA will find ~1/3 of >5 mJy 850 um SCUBA sources to be multiple systems. Based on our SMA observations and simulations, we suggest that large samples of existing SMGs should be imaged with sensitive interferometric observations, even if the SMGs were previously thought to be securely identified.