Tests of Statistical Significance and Background Estimation in Gamma-Ray Air Shower Experiments
Tests of Statistical Significance and Background Estimation in Gamma-Ray Air Shower Experiments
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DOI：
10.1086/381384
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发表时间：
2003-06
期刊：
影响因子：
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通讯作者：
R. Fleysher;L. Fleysher;P. Némethy;A. Mincer;T. Haines
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文献类型：
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作者：
R. Fleysher;L. Fleysher;P. Némethy;A. Mincer;T. Haines
在本文中，我们讨论了建立的方法的显着性计算测试存在的信号在未知的背景下，并指出其适用范围的限制。然后，我们介绍了一个新的自洽方案的源检测，并讨论了它的一些性质。该方法克服了以前使用的那些的弱点，并允许通过否决现有的本地化源和天空上的汇，并补偿已知的大规模各向异性纳入背景各向异性。通过给出一个例子，使用米拉格罗伽玛射线观测数据，我们演示了如何使用该方法来放松探测器的稳定性假设。新方法具有通用性，可用于任何大视场探测器，其中研究对象，稳态或瞬态，点或扩展，穿过其视场。
In this paper we discuss established methods of significance calculation for testing the existence of a signal in the presence of unknown background and point out the limits of their applicability. We then introduce a new self-consistent scheme for source detection and discuss some of its properties. The method overcomes weaknesses of those used previously and allows incorporating background anisotropies by vetoing existing localized sources and sinks on the sky and compensating for known large-scale anisotropies. By giving an example using the Milagro gamma-ray observatory data, we demonstrate how the method can be employed to relax the detector stability assumption. The new method is universal and can be used with any large field-of-view detector, in which the object of investigation, steady or transient, point or extended, traverses its field of view.