艾伦望远镜阵列快速射电瞬变蝇眼巡天
The Allen Telescope Array Fly's Eye Survey for Fast Radio Transients
摘要：
相对未被探索的快速无线电瞬态参数空间已知是各种有趣的来源的所在地，包括恒星、脉冲星巨脉冲和来自行星磁层的非热发射。此外，还提出了各种各样的假设，但尚未观察到的现象，如原始黑洞蒸发和与合并的大质量物体有关的瞬发辐射。2007年Lorimer等人宣布探测到一个明亮的（30 Jy）射电脉冲，推测其起源于河外，随后的惊愕表明明亮的射电脉冲作为星际介质和星系间介质探测器的潜在用途，以及需要进行表征快速瞬变参数空间的宽场调查。在这里，我们介绍了艾伦望远镜阵列（ATA）对明亮的分散射电脉冲进行的450小时、150度^2的蝇眼巡天的结果。Fly's Eye频谱仪在209 MHz带宽上产生128个通道的功率谱，中心频率为1430 MHz，在44个独立的信号路径上，由30个独立的ATA天线发出。在0 ~ 2000 pc cm^-3范围内对数据进行去色散处理，并在625 us ~ 5 s的持续时间内搜索色散测量值大于50 pc cm^-3的脉冲。观测中没有探测到脉冲，这意味着对于持续时间为10毫秒、视在能量密度大于440千焦μ s或平均通量密度大于44千焦μ s的脉冲，极限速率小于2天^-1小时^-1。在这里，我们提出的仪器，实验和观察的细节，包括讨论我们的结果，根据其他单脉冲搜索。
英文摘要：
The relatively unexplored fast radio transient parameter space is known to be home to a variety of interesting sources, including pulsars, pulsar giant pulses and non-thermal emission from planetary magnetospheres. In addition, a variety of hypothesized but as-yet-unobserved phenomena, such as primordial black hole evaporation and prompt emission associated with coalescing massive objects have been suggested. The 2007 announcement by Lorimer et al. of the detection of a bright (30 Jy) radio pulse that was inferred to be of extragalactic origin and the subsequent consternation have demonstrated both the potential utility of bright radio pulses as probes of the interstellar medium and intergalactic medium, as well as the need for wide-field surveys characterizing the fast-transient parameter space. Here we present results from the 450 hour, 150 deg^2 Fly's Eye survey for bright dispersed radio pulses at the Allen Telescope Array (ATA). The Fly's Eye spectrometer produces 128 channel power spectra over a 209 MHz bandwidth, centered at 1430 MHz, on 44 independent signals paths originating with 30 independent ATA antennas. Data were dedispersed between 0 and 2000 pc cm^-3 and searched for pulses with dispersion measures greater than 50 pc cm^-3 between 625 us and 5 s in duration. No pulses were detected in the survey, implying a limiting rate of less than 2 sky^-1 hour^-1 for 10 millisecond duration pulses having apparent energy densities greater than 440 kJy us, or mean flux densities greater than 44 Jy. Here we present details of the instrument, experiment and observations, including a discussion of our results in light of other single pulse searches.
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