Exploiting Orbital Constraints from Optical Data to Detect Binary Gamma-Ray Pulsars
Exploiting Orbital Constraints from Optical Data to Detect Binary Gamma-Ray Pulsars
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DOI：
10.3847/1538-4357/abaf53
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发表时间：
2020-04
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影响因子：
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通讯作者：
L. Nieder;B. Allen;C. Clark;H. J. P. M. F. Gravitationsphysik;L. Hannover;D. O. Physics;U. Wisconsin-Milwau
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文献类型：
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作者：
L. Nieder;B. Allen;C. Clark;H. J. P. M. F. Gravitationsphysik;L. Hannover;D. O. Physics;U. Wisconsin-Milwau
通过脉冲星的伽马射线发射来发现脉冲星是困难的，因为目前的仪器通常每百万转检测到不到一个光子。这给孤立的脉冲星带来了巨大的计算挑战，在这种情况下，典型的参数搜索空间在四个维度上跨越了很大的范围。当脉冲星处于双星系统中时，这一要求甚至更高，因为在双星系统中，轨道运动引入了几个额外的未知参数。在Pletsch&Clark早期工作的基础上，我们提出了此类搜索的最佳方法。这些还可以包括对要搜索的参数空间的外部约束，例如来自对假定的二元伴的光学观测。解决方案由两部分组成。第一种是通过参数空间度量在参数空间中构造最优搜索网格，用于初始半相干搜索和后续完全连贯的后续搜索。第二种是对周期性脉动进行解调和检测的方法。这些方法与传统的双星脉冲星无线电搜索方法具有不同的敏感性，并可能揭示新的脉冲星群体。
It is difficult to discover pulsars via their gamma-ray emission because current instruments typically detect fewer than one photon per million rotations. This creates a significant computing challenge for isolated pulsars, where the typical parameter search space spans wide ranges in four dimensions. It is even more demanding when the pulsar is in a binary system, where the orbital motion introduces several additional unknown parameters. Building on earlier work by Pletsch & Clark, we present optimal methods for such searches. These can also incorporate external constraints on the parameter space to be searched, for example, from optical observations of a presumed binary companion. The solution has two parts. The first is the construction of optimal search grids in parameter space via a parameter space metric, for initial semicoherent searches and subsequent fully coherent follow-ups. The second is a method to demodulate and detect the periodic pulsations. These methods have different sensitivity properties than traditional radio searches for binary pulsars and might unveil new populations of pulsars.