Comparison of the Measurement and Simulation with KM2A Prototype Array

The Large High Altitude Air Shower Observatory (LHAASO) is a new hybrid array for very high energy gamma ray astronomy and cosmic ray physics. The KM2A array, one of the main parts of LHAASO, covers an area of 1.3 km2 to observe gamma rays above 10 TeV up to 1 PeV for many sources. A prototype with 1% the size of the whole KM2A has been in stable operation for more than two years. A Monte Carlo simulation program named G4KM2A was developed; based on this work, the trigger rate, hit multiplicity, angular and core reconstruction are compared with KM2A prototype data. Finally, the moon shadow with -6.5 significance was obtained. The G4KM2A simulation results are consistent with KM2A prototype data and can be used for the whole KM2A array in future.

Download Full-text

Gamma-Ray Bursts at TeV Energies: Observational Status

Galaxies ◽

10.3390/galaxies10010007 ◽

2022 ◽

Vol 10 (1) ◽

pp. 7

Author(s):

Koji Noda ◽

Robert Daniel Parsons

Keyword(s):

Gamma Ray ◽

Cosmic Ray ◽

High Energy ◽

Gamma Ray Bursts ◽

High Energy Gamma ◽

Cosmic Ray Acceleration ◽

Very High Energy ◽

Energy Gamma ◽

Observational Status ◽

Very High

Gamma-ray bursts (GRBs) are some of the most energetic events in the Universe and are potential sites of cosmic ray acceleration up to the highest energies. GRBs have therefore been a target of interest for very high energy gamma-ray observatories for many years, leading to the recent discovery of a number of bursts with photons reaching energies above 100 GeV. We summarize the GRB observational campaigns of the current generation of very high energy gamma-ray observatories as well as describing the observations and properties of the GRBs discovered so far. We compare the properties of the very high energy bursts to the total GRB distribution and make predictions for the next generation of very high energy gamma-ray observations.

Download Full-text

Obtaining Cosmic‐Ray Propagation Parameters from Diffuse Very High Energy Gamma‐Ray Emission from the Galactic Center Ridge

The Astrophysical Journal ◽

10.1086/510611 ◽

2007 ◽

Vol 656 (2) ◽

pp. 841-846 ◽

Cited By ~ 5

Author(s):

I. Busching ◽

O. C. de Jager ◽

J. Snyman

Keyword(s):

Gamma Ray ◽

Galactic Center ◽

Cosmic Ray ◽

High Energy ◽

High Energy Gamma ◽

Propagation Parameters ◽

Very High Energy ◽

Energy Gamma ◽

Gamma Ray Emission ◽

Very High

Download Full-text

Highlights from H.E.S.S.

EPJ Web of Conferences ◽

10.1051/epjconf/201920901025 ◽

2019 ◽

Vol 209 ◽

pp. 01025

Author(s):

Mathieu de Naurois

Keyword(s):

Gamma Ray ◽

Cosmic Ray ◽

High Energy ◽

Physical Processes ◽

Galactic Source ◽

Very High Energy ◽

Energy Gamma ◽

Galactic Cosmic Ray ◽

Fundamental Physical ◽

Very High

In the 15 years since its construction, the H.E.S.S. gamma-ray observatory has allowed the study of the Very High Energy gamma-ray sky at resolutions and sensitivities which were never before possible. During this period H.E.S.S. has discovered a rich zoo of both galactic and extra galactic source classes, made measurements of the galactic cosmic ray spectrum and placed limits on fundamental physical processes. A summary of the latest H.E.S.S. results for these source classes has been presented at the conference, describing the most interesting new observations and their physical interpretation. Additionally the latest upgrades and improvements to the H.E.S.S. hardware and data analyses, and the future science prospects for the experiment have been described.

Download Full-text