用单成像切伦科夫望远镜用分形和小波分析从银河系区域搜索弥散宇宙gamma-ray通量
Search for diffuse cosmic gamma-ray flux using Fractal and Wavelet analysis from Galactic region using single imaging Cerenkov telescopes
摘要：
我们表明，从基于模拟的研究TACTIC望远镜的分形和小波分析的切伦科夫图像，记录在一个单一的成像切伦科夫望远镜，使几乎完全隔离的各向同性伽马射线引发的事件从压倒性的背景宇宙射线强子引发的事件。这为测量1 TeV能量以上的银河系和河外γ射线本底提供了一种新的方法。本文报告了基于这种方法的初步结果。主要目的是探索使用单个成像大气切伦科夫望远镜（IACT）记录的数据进行精确测量的扩散银河和河外伽玛射线通量以上~1 TeV的能量的可能性。使用模拟数据的大气Cerenkov图像记录在IACT，发起的宇宙射线质子和扩散γ射线与能量分别超过4 TeV和2 TeV，我们确定最有效的分形/小波参数的记录图像的初步识别。该方法是基于模式识别技术，并采用分形和小波分析记录的γ-强子分离的Cerenkov图像。我们发现，小波维数参数B6的值可以隔离的切伦科夫图像的强子起源的漫伽玛射线起源的准确率几乎为100%。利用TACTIC望远镜记录的36小时数据，我们得到了|b| \leq -50和|l| \leq 2000星系范围内2 TeV以上弥散星系γ射线通量的初步上限估计。
英文摘要：
We show from a simulations-based study of the TACTIC telescope that fractal and wavelet analysis of Cerenkov images, recorded in a single imaging Cerenkov telescope, enables almost complete segregation of isotropic gamma-ray initiated events from the overwhelming background of cosmic-ray hadron-initiated events. This presents a new method for measuring galactic and extragalactic gamma-ray background above 1 TeV energy. Preliminary results based on this method are reported here. Primary aim is to explore the possibility of using data recorded by a single imaging atmospheric Cerenkov telescope(IACT) for making accurate measurements of diffuse galactic and extragalactic gamma-ray flux above ~1 TeV energy. Using simulated data of atmospheric Cerenkov images recorded in an IACT, initiated both by cosmic ray protons and diffuse gamma-rays with energies above 4 TeV and 2 TeV respectively, we identify the most efficient fractal /wavelet parameters of the recorded images for primary identification. The method is based on the pattern recognition technique and employs fractal and wavelet analysis of the recorded Cerenkov images for gamma-hadron segregation. We show that the value of wavelet dimension parameter B6 can segregate Cerenkov images of hadronic origin from those of diffuse gamma-ray origin with almost 100% accuracy. We use the results to get a preliminary upper limit estimate of the diffuse galactic gamma-ray flux within galactic range of |b|\leq -50 and |l|\leq 2000 above 2TeV from a 36h data set recorded by the TACTIC telescope.
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