Observations of very high energy gamma-ray emission from AGNs with the ground-based EAS arrays

Abstract

The ground-based EAS array is usually operated with a high duty cycle (> 90%) and a large field of view (~2 sr), which can continuously monitor the sky. It is essential and irreplaceable to understand the gamma-ray emission mechanism and intrinsic physics progress of the variable source AGN. The EAS arrays, AS-r experiment (since 1990) and ARGO-YBJ experiment (since 2007), have continuously monitored the northern sky at energies above 3 TeV and 0.3 TeV, respectively. They have made substantial contributions for long-term monitoring of Mrk 421 and Mrk 501. In this paper, we will review the results obtained by the EAS arrays. The next generation of EAS array, LHAASO project, will boost the sensitivity of current EAS array at least up to 30 times with a much wider energy range from 40 GeV to 1 PeV. Beside increasing the number of VHE gamma-ray sources, it will guide us look sight into the properties of jet, and throw light on the determining of the EBL, intergalactic magnetic fields, and the validity of the Lorentz Invariance.

10 pages, 12 figures

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• Fermi Large Area Telescope Second Source Catalog
• Very-High-Energy Gamma Rays from a Distant Quasar: How Transparent Is the Universe?
• Fast variability of TeV gamma-rays from the radio galaxy M 87
• New constraints on the Mid-IR EBL from the HESS discovery of VHE gamma rays from 1ES 0229+200
• Fermi Gamma-ray Imaging of a Radio Galaxy
• The 2010 very high energy gamma-ray flare & 10 years of multi-wavelength observations of M 87
• Search for Lorentz Invariance breaking with a likelihood fit of the PKS 2155-304 flare data taken on MJD 53944
• Gamma-ray induced cascades and magnetic fields in intergalactic medium
• Observation of TeV gamma rays from the Cygnus region with the ARGO-YBJ experiment
• Long-term Monitoring on Mrk 501 for Its VHE gamma Emission and a Flare in October 2011
• Collective Evidence for Inverse Compton Emission from External Photons in High-Power Blazars
• Observation of the TeV gamma-ray source MGRO J1908+06 with ARGO-YBJ
• Observation of TeV gamma-rays from the unidentified source HESS J1841-055 with the ARGO-YBJ experiment
• Correlated Variability in Blazars

Cited by in corpus (3)

• Identification of the TeV Gamma-ray Source ARGO J2031+4157 with the Cygnus Cocoon
• 4.5 years multi-wavelength observations of Mrk 421 during the ARGO-YBJ and Fermi common operation time
• Multi-wavelength study of the MGRO J2019+37