艾伦望远镜阵列20厘米巡天--700平方度多历元射电数据集-- II：单个历元瞬态统计
The Allen Telescope Array Twenty-centimeter Survey -- A 700-Square-Degree, Multi-Epoch Radio Dataset -- II: Individual Epoch Transient Statistics
摘要：
我们提出了我们的第二篇论文艾伦望远镜阵列二十厘米调查（ATATS），多时代，~700平方米。°的1.4 GHz的无线电图像和目录。该调查旨在检测罕见的明亮瞬变，以及委托ATA的广域调查能力。ATATS探讨了多历元瞬态和可变源调查在动态范围限制和变化（u，v）覆盖范围领域的挑战。在这里，我们提出的图像使用的数据从个别时期，以及修订后的图像结合数据从所有ATATS时期。组合图像的RMS噪声为3.96 mJy /光束，圆形光束的FWHM为150 arcsec。使用错误检测率算法生成的目录包含4984个源，并且>90%完成到37.9 mJy。从各个时代的快照图像生成的目录包含564平方米的1170到2019个源。°的所有时代的共同点。单历元星表的90%完整性极限范围为98.6 ~ 232 mJy。我们将从组合图像生成的目录与来自各个时期的目录以及来自NRAO VLA巡天（NVSS）的目录进行比较，NVSS是相同频率的传统巡天。我们能够对临时人口施加新的限制：少于6 e-4个临时人口/平方。度，对于亮度超过350 mJy的瞬变，其特征时间尺度为几分钟到几天。根据Matsumura等人（2009）所报告的3.1e-3 / sq的速率，这强烈地排除了~1 Jy源的天文起源。°的
英文摘要：
We present our second paper on the Allen Telescope Array Twenty-centimeter Survey (ATATS), a multi-epoch, ~700 sq. deg. radio image and catalog at 1.4 GHz. The survey is designed to detect rare, bright transients as well as to commission the ATA's wide-field survey capabilities. ATATS explores the challenges of multi-epoch transient and variable source surveys in the domain of dynamic range limits and changing (u,v) coverage. Here we present images made using data from the individual epochs, as well as a revised image combining data from all ATATS epochs. The combined image has RMS noise 3.96 mJy / beam, with a circular beam of 150 arcsec FWHM. The catalog, generated using a false detection rate algorithm, contains 4984 sources, and is >90% complete to 37.9 mJy. The catalogs generated from snapshot images of the individual epochs contain between 1170 and 2019 sources over the 564 sq. deg. area in common to all epochs. The 90% completeness limits of the single epoch catalogs range from 98.6 to 232 mJy. We compare the catalog generated from the combined image to those from individual epochs, and from the NRAO VLA Sky Survey (NVSS), a legacy survey at the same frequency. We are able to place new constraints on the transient population: fewer than 6e-4 transients / sq. deg., for transients brighter than 350 mJy with characteristic timescales of minutes to days. This strongly rules out an astronomical origin for the ~1 Jy sources reported by Matsumura et al. (2009), based on their stated rate of 3.1e-3 / sq. deg.
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