VHE gamma-ray observation of Crab Nebula with HAGAR telescope array

被引：0
|
作者：
B. B. Singh
R. J. Britto
V. R. Chitnis
A. Shukla
L. Saha
A. Sinha
B. S. Acharya
P. R. Vishwanath
G. C. Anupama
P. Bhattacharjee
K. S. Gothe
B. K. Nagesh
T. P. Prabhu
S. K. Rao
R. Srinivasan
S. S. Upadhya
机构：
[1] Tata Institute of Fundamental Research,Department of Physics
[2] Indian Institute of Astrophysics,Institute for Theoretical Physics and Astrophysics
[3] Saha Institute of Nuclear Physics,undefined
[4] University of the Free State,undefined
[5] Universität Würzburg,undefined
[6] Universidad de Complutense,undefined
[7] Astroparticule et Cosmologie/CNRS/ Université Paris Diderot,undefined
来源：
Experimental Astronomy | 2019年 / 47卷
关键词：
Crab nebula; Cherenkov telescopes; VHE ; -rays;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
HAGAR is a system of seven Non-imaging Atmospheric Cherenkov Telescopes located at Hanle in the Ladakh region of the Indian Himalayas at an altitude of 4270 meters amsl. Since 2008, we have observed the Crab Nebula to assess the performance of the HAGAR telescopes. We describe the analysis technique for the estimation of γ-ray signal amidst cosmic ray background. The consolidated results spanning nine years of the Crab nebula observations show long term performance of the HAGAR telescopes. Based on about 219 hours of data, we report the detection of γ-rays from the Crab Nebula at a significance level of about 20σ, corresponding to a time averaged flux of (1.64±0.09) × 10− 10 photons cm− 2 sec− 1 above 230 GeV. Also, we perform a detailed study of possible systematic effects in our analysis method on data taken with the HAGAR telescopes.
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页码：177 / 198
页数：21
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