Observations of TeV Gamma Ray from the Galactic Plane

XU Chun-Xian; ZHANG Yong; HE Hui-Lin; HE Hui-Hai; CHEN Yong-Zhong; JIANG Yin-Lin

Chinese Physics C> 2001, Vol. 25> Issue(9) : 799-806

Observations of TeV Gamma Ray from the Galactic Plane

Laboratory of Cosmic Ray and High Energy Astrophysics, Institute of High Energy Physics, CAS, Beijing 100039, China

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Abstract：
We present here the result of observation of TeV gamma ray emission from the galactic plane at a galactic longitude of 79.3866 deg. With Atmospheric Cherenkov Telescopes (ACT2 and ACT3) located at Xinglong station. The data was taken between Oct. 1995 and Nov. 1998 over a total time of 224.4h in the standard ON-OFF mode. Assuming the data obey Gaussian distribution, a formula of the maximum likelihood ratio λ was derived that gives the probability of significance level directly. Using the formula, we analysed the data and found that there is no evidence for TeV gamma ray emission from the galactic plane within statistic error.

References

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XU Chun-Xian, ZHANG Yong, HE Hui-Lin, HE Hui-Hai, CHEN Yong-Zhong and JIANG Yin-Lin. Observations of TeV Gamma Ray from the Galactic Plane[J]. Chinese Physics C, 2001, 25(9): 799-806.

XU Chun-Xian, ZHANG Yong, HE Hui-Lin, HE Hui-Hai, CHEN Yong-Zhong and JIANG Yin-Lin. Observations of TeV Gamma Ray from the Galactic Plane[J]. Chinese Physics C, 2001, 25(9): 799-806. shu

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Received: 2000-08-22
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Observations of TeV Gamma Ray from the Galactic Plane

Corresponding author: XU Chun-Xian,

Laboratory of Cosmic Ray and High Energy Astrophysics, Institute of High Energy Physics, CAS, Beijing 100039, China

Received Date: 2000-08-22
Accepted Date: 1900-01-01
Available Online: 2001-09-05

Abstract: We present here the result of observation of TeV gamma ray emission from the galactic plane at a galactic longitude of 79.3866 deg. With Atmospheric Cherenkov Telescopes (ACT2 and ACT3) located at Xinglong station. The data was taken between Oct. 1995 and Nov. 1998 over a total time of 224.4h in the standard ON-OFF mode. Assuming the data obey Gaussian distribution, a formula of the maximum likelihood ratio λ was derived that gives the probability of significance level directly. Using the formula, we analysed the data and found that there is no evidence for TeV gamma ray emission from the galactic plane within statistic error.