MULTI-TeV GAMMA-RAY OBSERVATION FROM THE CRAB NEBULA USING THE TIBET-III AIR SHOWER ARRAY FINELY TUNED BY THE COSMIC RAY MOON'S SHADOW

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	MULTI-TeV GAMMA-RAY OBSERVATION FROM THE CRAB NEBULA USING THE TIBET-III AIR SHOWER ARRAY FINELY TUNED BY THE COSMIC RAY MOON'S SHADOW
	Tibet ASGamma Collaboration
刊名	ASTROPHYSICAL JOURNAL
	2009
卷号	692 期号:1 页码:61-72
关键词	HELIUM SPECTRA GALACTIC PLANE SOLAR-ACTIVITY ENERGY-RANGE NORTHERN SKY SEARCH EMISSION PULSARS SUN ANTIPROTONS
通讯作者	Amenomori, M (reprint author), Hirosaki Univ, Dept Phys, Hirosaki, Aomori 0368561, Japan.
英文摘要	The Tibet-III air shower array, consisting of 533 scintillation detectors, has been operating successfully at Yangbajing in Tibet, China since 1999. Using the data set collected by this array from 1999 November through 2005 November, we obtained the energy spectrum of gamma-rays from the Crab Nebula, expressed by a power law as (dJ/dE) = (2.09 +/- 0.32) x 10(-12)(E/3 TeV)(-2.96 +/- 0.14) cm(-2) s(-1) TeV(-1) in the energy range of 1.7-40 TeV. This result is consistent with other independent gamma-ray observations by imaging air Cherenkov telescopes. In this paper, we carefully checked and tuned the performance of the Tibet-III array using data on the Moon's shadow in comparison with a detailed Monte Carlo (MC) simulation. The shadow is shifted to the west of the Moon's apparent position as an effect of the geomagnetic field, although the extent of this displacement depends on the primary energy of positively charged cosmic rays. This finding enables us to estimate the systematic error in determining the primary energy from its shower size. This error is estimated to be less than +/- 12% in our experiment. This energy scale estimation is the first attempt among cosmic ray experiments at ground level. The systematic pointing error is also estimated to be smaller than 0 degrees.011. The deficit rate and the position of the Moon's shadow are shown to be very stable within a statistical error of +/- 6% year by year. This guarantees the long-term stability of pointlike source observation with the Tibet-III array. These systematic errors are adequately taken into account in our study of the Crab Nebula.
学科主题	Astronomy & Astrophysics
类目[WOS]	Astronomy & Astrophysics
收录类别	SCI
语种	英语
WOS记录号	WOS:000263553000005
公开日期	2016-02-25
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/212890]
专题	高能物理研究所_粒子天体物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Tibet ASGamma Collaboration. MULTI-TeV GAMMA-RAY OBSERVATION FROM THE CRAB NEBULA USING THE TIBET-III AIR SHOWER ARRAY FINELY TUNED BY THE COSMIC RAY MOON'S SHADOW[J]. ASTROPHYSICAL JOURNAL,2009,692(1):61-72.
APA	Tibet ASGamma Collaboration.(2009).MULTI-TeV GAMMA-RAY OBSERVATION FROM THE CRAB NEBULA USING THE TIBET-III AIR SHOWER ARRAY FINELY TUNED BY THE COSMIC RAY MOON'S SHADOW.ASTROPHYSICAL JOURNAL,692(1),61-72.
MLA	Tibet ASGamma Collaboration."MULTI-TeV GAMMA-RAY OBSERVATION FROM THE CRAB NEBULA USING THE TIBET-III AIR SHOWER ARRAY FINELY TUNED BY THE COSMIC RAY MOON'S SHADOW".ASTROPHYSICAL JOURNAL 692.1(2009):61-72.