Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-07-27
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
4 pages, Proceedings of the 31st International Cosmic Ray Conference, 7-15 July 2009, Lodz (Poland)
Scientific paper
A sky monitoring at gamma ray energy E > 0.6 TeV has been performed by the full coverage Extensive Air Shower detector ARGO-YBJ, located in Tibet at 4300 m of altitude. We monitored 135 galactic and extragalactic gamma ray sources in the sky declination band from -10 to +70 degrees for 424 days, detecting the Crab Nebula and Mrk421 with a significance respectively of 7.0 and 8.0 standard deviations. For a set of 11 AGNs known to emit in the TeV energy range, the search has been performed in time scales of 1, 10 and 30 days in order to study possible flaring activities. Significant emissions has been observed from Mrk421 in the time scales of 10 and 30 days, during June and March 2008, when the source had a strong activity also observed in the X-rays waveband. The analysis of the background has revealed the existence of a significant excess of the CR flux in two localized regions of angular size 10-30 degrees, in agreement with previous indications.
for the ARGO-YBJ Collaboration
Guglielmotto Z.
Vernetto Silvia
Zhang Jie-Lin
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