Angular resolution of the Ooty EAS array based on UHE gamma rays from Her X-1
Angular resolution of the Ooty EAS array based on UHE gamma rays from Her X-1
复制标题
基于 Her X-1 的 UHE 伽马射线的 Ooty EAS 阵列的角分辨率
DOI：
10.1088/0954-3899/17/8/016
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
S. Tonwar
中科院分区：
文献类型：
--
作者：
Sourendu Gupta;S. Tonwar
大多数实验小组在不知道任何稳定和强的离散源的情况下，通常通过子阵列之间的相互比较来确定用于研究超高能伽马射线宇宙源的广泛空气簇射阵列的角分辨率。子阵列主要是通过将主阵列分成两个阵列来获得的，一个包含偶数探测器，另一个包含奇数探测器。使用这种方法的24探测器阵列在Ooty在1984年至1987年期间的角分辨率估计为约1.5度。最近，Ooty小组报告了从Her X-1中探测到四次脉冲发射的超高能光子，这些光子已被证明是锁相的，周期为1.2357701 s。作者利用来自Her X-1的这一本底较低的信号对Ooty阵列的角分辨率进行了研究。阵列的角分辨率已被确定为1.6度+或-0.4度。这是第一次使用超高能光子点源直接测量空气簇射阵列的角分辨率。
The angular resolution of an extensive air shower array for studies on cosmic sources of ultra-high-energy gamma rays has been determined by most of the experimental groups generally by inter-comparison between sub-arrays, in the absence of the knowledge of any steady and strong discrete source. The sub-arrays have been obtained mostly by dividing the main array into two arrays, one containing the even-numbered detectors and another having the odd-numbered detectors. Using this method the angular resolution of the 24-detector array operated at Ooty during 1984-7 was estimated to be about 1.5 degrees . Recently the Ooty group has reported the detection of four episodes of pulsed emission of ultra-high-energy photons from Her X-1 which have been shown to be phase locked with a period of 1.2357701 s. The authors have made a study of the angular resolution for the Ooty array using this signal from Her X-1 which had a relatively low background. The angular resolution of the array has been determined to be 1.6 degrees +or-0.4 degrees . This is the first direct measurement of angular resolution of an air shower array using a point source of ultra-high-energy photons.