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Modern detectors of cosmic gamma-rays are a special type of imaging telescopes (air Cherenkov telescopes) supplied with cameras with a relatively large number of photomultiplier-based pixels. For example, the camera of the TAIGA-IACT…

VERITAS (Very Energetic Radiation Imaging Telescope Array System) is the current-generation array comprising four 12-meter optical ground-based Imaging Atmospheric Cherenkov Telescopes (IACTs). Its primary goal is to indirectly observe…

Instrumentation and Methods for Astrophysics · Physics 2023-08-23 J. Hoang , D. A. Williams

Imaging Air Cherenkov Telescopes (IACTs) are essential to ground-based observations of gamma rays in the GeV to TeV regime. One particular challenge of ground-based gamma-ray astronomy is an effective rejection of the hadronic background.…

Instrumentation and Methods for Astrophysics · Physics 2023-11-08 Jonas Glombitza , Vikas Joshi , Benedetta Bruno , Stefan Funk

Imaging Atmospheric Cherenkov Telescopes (IACTs) have resulted in a breakthrough in very-high energy (VHE) gamma-ray astrophysics. While early IACT installations faced the problem of detecting any sources at all, current instruments are…

Astrophysics · Physics 2009-11-19 Konrad Bernlohr

The TAIGA experimental complex is a hybrid observatory for high-energy gamma-ray astronomy in the range from 10 TeV to several EeV. The complex consists of such installations as TAIGA- IACT, TAIGA-HiSCORE and a number of others. The…

Instrumentation and Methods for Astrophysics · Physics 2022-11-23 Anna Vlaskina , Alexander Kryukov

The Cherenkov Telescope Array is the next generation of observatory using imaging air Cherenkov technique for very-high-energy gamma-ray astronomy. Its first prototype telescope is operational on-site at La Palma and its data acquisitions…

Instrumentation and Methods for Astrophysics · Physics 2024-03-22 Michaël Dell'aiera , Mikaël Jacquemont , Thomas Vuillaume , Alexandre Benoit

In order to better utilize the information contained in the shower images generated by imaging Cherenkov telescopes (IACTs) equipped with cameras with small pixels, images are fit to a parametrization of image shapes gained from Monte Carlo…

Astrophysics · Physics 2007-05-23 M. Ulrich , A. Daum , G. Hermann , W. Hofmann

We estimate the limiting angular resolution and detection area for an array of 3 large-aperture Imaging Atmospheric Cherenkov Telescopes. We consider an idealized IACT system in order to understand the limitations imposed by the intrinsic…

Astrophysics · Physics 2007-10-02 V. V. Bugaev , J. H. Buckley , H. Krawczynski

The Cherenkov Telescope Array (CTA) will be the world's leading ground-based gamma-ray observatory allowing us to study very high energy phenomena in the Universe. CTA will produce huge data sets, of the order of petabytes, and the…

Instrumentation and Methods for Astrophysics · Physics 2018-10-02 S. Mangano , C. Delgado , M. Bernardos , M. Lallena , J. J. Rodríguez Vázquez

The precise reconstruction of properties of photons and electrons in modern high energy physics detectors, such as the CMS or Atlas experiments, plays a crucial role in numerous physics results. Conventional geometrical algorithms are used…

High Energy Physics - Experiment · Physics 2023-11-30 Polina Simkina , Fabrice Couderc , Julie Malclès , Mehmet Özgür Sahin

The HEGRA system of Imaging Atmospheric Cherenkov Telescopes (IACTs) detects Cherenkov light produced by air showers. The concept of stereoscopic observation with the five HEGRA telescopes allows the reconstruction of various shower…

Astrophysics · Physics 2007-05-23 M. Doering , K. Bernloehr , G. Hermann , W. Hofmann , H. Lampeitl

The extremely low flux of ultra-high energy cosmic rays (UHECR) makes their direct observation by orbital experiments practically impossible. For this reason all current and planned UHECR experiments detect cosmic rays indirectly by…

High Energy Astrophysical Phenomena · Physics 2020-09-15 D. Ivanov , O. E. Kalashev , M. Yu. Kuznetsov , G. I. Rubtsov , T. Sako , Y. Tsunesada , Y. V. Zhezher

HAWC is a ground-based observatory consisting of 300 water Cherenkov detectors, which observes the extensive air showers induced by cosmic rays from some TeV to a few PeV and, in particular, gamma rays from 300 GeV to more than 100 TeV. One…

High Energy Astrophysical Phenomena · Physics 2023-10-12 A. Alvarado , T. Capistrán , I. Torres , J. R. SacahuÍ , R. Alfaro

For the current generation of Imaging Atmospheric Cherenkov Telescopes (IACTs), with their large mirrors and their cameras with fine segmentation of photodetectors, the focusing capability is a relevant issue. The optical system of an IACT…

High Energy Astrophysical Phenomena · Physics 2019-08-14 C. Trichard , A. Fiasson , G. Maurin , G. Lamanna

Imaging atmospheric Cherenkov telescopes (IACTs) are the main technique for detecting gamma rays with energies between tens of GeV and hundreds of TeV. Amongst them, the High Energy Stereoscopic System (H.E.S.S.) has pioneered the use of…

High Energy Astrophysical Phenomena · Physics 2026-04-01 Rodrigo Guedes Lang , Tim Unbehaun , Lars Mohrmann , Simon Steinmassl , Jim Hinton , Stefan Funk

The Cosmic Multiperspective Event Tracker (CoMET) R&D project aims to optimize the techniques for the detection of soft-spectrum sources through very-high-energy gamma-ray observations using particle detectors (called ALTO detectors), and…

Instrumentation and Methods for Astrophysics · Physics 2021-07-30 Tomas Bylund , Gašper Kukec Mezek , Mohanraj Senniappan , Yvonne Becherini , Michael Punch , Satyendra Thoudam , Jean-Pierre Ernenwein

Imaging Air Cherenkov Telescopes (IACTs) detect the Cherenkov light flashes of Extended Air Showers (EAS) triggered by very high energy (VHE) gamma-rays impinging on the Earth's atmosphere. Due to the overwhelming background from hadron…

Astrophysics · Physics 2008-02-06 S. C. Commichau , A. Biland , D. Kranich , R. de los Reyes , A. Moralejo , D. Sobczynska

The High Energy Stereoscopic System (H.E.S.S.) very high energy gamma-ray telescope array has added a fifth telescope of 600 m$^{2}$ mirror area to the centre of the 4 existing telescopes, lowering its energy threshold to the sub-100 GeV…

Instrumentation and Methods for Astrophysics · Physics 2019-08-14 R. D. Parsons , M. Gajdus , T. Murach

We present a new paradigm for the simulation of arrays of Imaging Atmospheric Cherenkov Telescopes (IACTs) which overcomes limitations of current approaches. Up to now, all major IACT experiments rely on the same Monte-Carlo simulation…

High Energy Astrophysical Phenomena · Physics 2017-11-06 M. Holler , J. Chevalier , J. -P. Lenain , M. de Naurois , D. Sanchez

In recent years, Imaging Atmospheric Cherenkov Telescopes (IACTs) have discovered a rich diversity of very high energy (VHE, > 100 GeV) gamma-ray emitters in the sky. These instruments image Cherenkov light emitted by gamma-ray induced…

Instrumentation and Methods for Astrophysics · Physics 2009-05-27 Stefan Ohm , Christopher van Eldik , Kathrin Egberts