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arXiv 2004.11740astro-ph.HEastro-ph.IMgr-qc
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利用光学数据的轨道约束探测二元Gamma-ray脉冲星

Exploiting Orbital Constraints from Optical Data to Detect Binary Gamma-ray Pulsars

L. Nieder, B. Allen, C. J. Clark, H. J. Pletsch

摘要:

很难通过它们的伽马射线发射来发现双星,因为目前的仪器通常每百万次旋转检测不到一个光子。这为孤立的搜索器带来了巨大的计算挑战,其中典型的参数搜索空间在四维中跨越很宽的范围。当脉冲星处于双星系统中时,要求甚至更高,其中轨道运动引入了几个额外的未知参数。在Pletsch & Clark(arXiv:1408.6962)早期工作的基础上,我们提出了这种搜索的最佳方法。这些也可以结合外部约束的参数空间进行搜索,例如,从光学观测的一个假定的二进制伴侣。解决办法有两部分。首先是通过参数空间度量在参数空间中构建最优搜索网格,用于初始半相干搜索和随后的完全相干后续搜索。第二种是解调和检测周期性脉动的方法。这些方法与传统的无线电搜索双星具有不同的灵敏度特性,可能会发现新的双星种群。

英文摘要:

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 (arXiv:1408.6962), 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.

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