Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2011-10-09
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
32nd International Cosmic Ray Conference 2011 Beijing China, 4 pages, 4 figures
Scientific paper
The ARGO-YBJ experiment is an extensive air shower array with full coverage RPC detectors located at Yangbajing (4300 m asl, Tibet, China). It is operated with high duty cycle (>86%) and a large field of view ($\sim$ 2sr). It continuously monitors the entire overhead sky at $\gamma$-ray energies above 0.1 TeV. In the talk, we will present the result of the northern sky survey (between declinations of -10$^{\circ}$ and 70$^{\circ}$) from an analysis of ~4 years of the ARGO-YBJ data (between July 2006 and February 2011). There are four known TeV sources observed with significance greater than 5 S.D.. The significance from Crab Nebula is more than 16 S.D.. 90% confidence level upper limits to the flux from all directions in the sky are also presented, which vary from 0.09 to 0.53 Crab unit for Crab-like point sources.
ARGO-YBJ collaboration for the
Cao Zhoujian
Chen S. Z.
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