A Northern Sky Survey for Both TeV CR anisotropy and - ray Sources with Tibet Air Shower Array Hongbo Hu ([email protected]) For Tibet AScollaboration • The Tibet AS-gamma Experiment ; • Two Analyses Methods; • Preliminary Results; • Discussion and Conclusions. 2004.8 Institute of High Energy Physics
13
Embed
A Northern Sky Survey for Both TeV CR anisotropy and -ray Sources with Tibet Air Shower Array Hongbo…
3,600m 2 (in area) Tibet-HD Tibet array: ~250 x 250 m 2 HD: 60 x 60m 2 Tibet-III: ~150x150 m 2 Tibet-III Tibet-HD Operation Time Live Time Selected Events Mode Energy Resolution ) Area Tibet- HD ~ days1.5×10 9 ~3TeV0.9 o 3600m 2 Tibet-III ~ days5.5×10 9 ~3TeV0.9 o 22050m 2 Tibet Air Shower Array
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
A Northern Sky Survey for Both TeV CR anisotropy and -ray Sources
• S.W. Cui and C.T. Yan, in Proc. 28th ICRC, 2315. Observed 4 σ; EGRET counterpart 3EG J2016+3657 RA :304.008 DEC : 37.2 Milagro (306.6,38.9) 4.2 σ (Atkins,R., et al 2004, ApJ, 608,680)
~0 σ
4.2 σ
b=+5˚b=0˚ b=-5˚
b=+5˚b=0˚ b=-5˚
b=+5˚b=0˚ b=-5˚
3.9 σ
4.4 σ
4.5 σ
2.9 σ
Up flux limit (by method I)
(30 degree of declination related to YBJ zenith direction)
Conclusions
• Large scale anisotropy of CR. intensity with a magnitude about 0.1% are observed in two dimensions in TeV energy range.
• Crab and Mrk421 are detected with 5 σ level.
• No other significant point source is found, and an upper-flux limit curve is given