scholarly journals Highlights from H.E.S.S.

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.

EVOLUTION OF THE RADIO OUTFLOW IN LS 5039

2014 ◽  
Vol 28 ◽  
pp. 1460196
Author(s):  
J. MOLDÓN ◽  
M. RIBÓ ◽  
J. M. PAREDES
Keyword(s):  
Gamma Ray ◽  
Morphological Changes ◽  
High Energy ◽  
Physical Processes ◽  
Long Baseline ◽  
Very High Energy ◽  
Energy Gamma ◽  
Orbital Modulation ◽  
5 Ghz ◽  
Very High

Gamma-ray binaries allow us to study physical processes such as particle acceleration up to TeV energies as well as very high energy gamma-ray emission and absorption with changing geometrical configurations on a periodic basis. These sources produce outflows of radio-emitting particles whose structure can be imaged with very long baseline interferometry (VLBI). We observed the gamma-ray binary LS 5039 with the VLBA at 5 GHz during five consecutive days. We present the observed radio morphological changes, which display a periodic orbital modulation. Multifrequency and multiepoch VLBI observations conducted during the last decade confirm that the morphological periodicity is stable on timescales of years. Using a simple model we show that the observed behavior is compatible with the presence of a young non-accreting pulsar with an outflow behind it.

scholarly journals Gamma-Ray Bursts at TeV Energies: Observational Status

Galaxies ◽  
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.

scholarly journals Comparison of the Measurement and Simulation with KM2A Prototype Array

2019 ◽  
Vol 208 ◽  
pp. 14006
Author(s):  
Zhe Li ◽  
Songzhan Chen ◽  
Huihai He ◽  
Cong Li ◽  
Hongkui Lv ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Cosmic Ray ◽  
High Energy ◽  
Stable Operation ◽  
Air Shower ◽  
Very High Energy ◽  
Energy Gamma ◽  
Many Sources ◽  
Very High ◽  
Monte Carlo Simulation Program

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.

scholarly journals A STRONG RADIO BRIGHTENING AT THE JET BASE OF M 87 DURING THE ELEVATED VERY HIGH ENERGY GAMMA-RAY STATE IN 2012

2014 ◽  
Vol 788 (2) ◽  
pp. 165 ◽  
Author(s):  
K. Hada ◽  
M. Giroletti ◽  
M. Kino ◽  
G. Giovannini ◽  
F. D'Ammando ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
High Energy Gamma ◽  
Very High Energy ◽  
Energy Gamma ◽  
Very High
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