Explanipedia

Development and quality control of PMT modules for the large-sized telescopes of the Cherenkov Telescope Array Observatory Open

T. Saito, Mitsunari Takahashi, Yusuke Inome, Hidetarô Abe, Manuel Artero , et al. · 2025

International audience

Characterization of Markarian 421 during its most violent year: Multiwavelength variability and correlations Open

K. Abe, S. Abe, J. Abhir, A. Abhishek, V. A. Acciari , et al. · 2025

Aims. Mrk 421 was in its most active state around early 2010, which led to the highest TeV gamma-ray flux ever recorded from any active galactic nuclei (AGN). We aim to characterize the multiwavelength behavior during this exceptional year…

Multiwavelength study of OT 081: broadband modelling of a transitional blazar Open

Hidetarô Abe, S. Abe, V. A. Acciari, I. Agudo, T. Aniello , et al. · 2024

OT 081 is a well-known, luminous blazar that is remarkably variable in many energy bands. We present the first broadband study of the source, which includes very high energy (VHE, $E\gt $ 100 GeV) $\gamma$-ray data taken by the MAGIC (Majo…

Multi-wavelength study of OT 081: broadband modelling of a transitional blazar Open

Hidetarô Abe, S. Abe, V.A Acciari, I. Agudo, T. Aniello , et al. · 2024

OT 081 is a well-known, luminous blazar that is remarkably variable in many energy bands. We present the first broadband study of the source which includes very-high-energy (VHE, $E>$100\,GeV) $γ$-ray data taken by the MAGIC and H.E.S.S. i…

Methodology for the integration of the array control and data acquisition system with array elements of the Cherenkov Telescope Array Observatory Open

Bernhard Lopez, Pierre Aubert, Leonardo Baroncelli, Jan-Philipp Bolle, Pietro Bruno , et al. · 2024

International audience

The first release of the Cherenkov Telescope Array Observatory array control and data acquisition software Open

R. Mirzoyan, Pierre Aubert, Leonardo Baroncelli, Jan-Philipp Bolle, Pietro Bruno , et al. · 2024

International audience

Constraints on Lorentz invariance violation from the extraordinary Mrk 421 flare of 2014 using a novel analysis method Open

S. Abe, J. Abhir, A. Abhishek, V. A. Acciari, Arnau Aguasca-Cabot , et al. · 2024

The Lorentz Invariance Violation (LIV), a proposed consequence of certain quantum gravity (QG) scenarios, could instigate an energy-dependent group velocity for ultra-relativistic particles. This energy dependence, although suppressed by t…

Performance and first measurements of the MAGIC stellar intensity interferometer Open

MAGIC Collaboration, S. Abe, J. Abhir, V. A. Acciari, Arnau Aguasca-Cabot , et al. · 2024

In recent years, a new generation of optical intensity interferometers has emerged, leveraging the existing infrastructure of Imaging Atmospheric Cherenkov Telescopes (IACTs). The MAGIC telescopes host the MAGIC-SII system (Stellar Intensi…

First characterization of the emission behavior of Mrk 421 from radio to very high-energy gamma rays with simultaneous X-ray polarization measurements Open

S. Abe, J. Abhir, V. A. Acciari, I. Agudo, T. Aniello , et al. · 2024

Aims. We have performed the first broadband study of Mrk 421 from radio to TeV gamma rays with simultaneous measurements of the X-ray polarization from IXPE. Methods. The data were collected as part of an extensive multiwavelength campaign…

Constraints on axion-like particles with the Perseus Galaxy Cluster with MAGIC Open

Hidetarô Abe, S. Abe, J. Abhir, V. A. Acciari, I. Agudo , et al. · 2024

Constraints on axion-like particles with the Perseus Galaxy Cluster with MAGIC Open

MAGIC Collaboration, Hidetarô Abe, S. Abe, J. Abhir, V. A. Acciari , et al. · 2024

Axion-like particles (ALPs) are pseudo-Nambu-Goldstone bosons that emerge in various theories beyond the standard model. These particles can interact with high-energy photons in external magnetic fields, influencing the observed gamma-ray …

Multi-year characterisation of the broad-band emission from the intermittent extreme BL Lac 1ES 2344+514 Open

Hyuga Abe, S. Abe, V. A. Acciari, I. Agudo, T. Aniello , et al. · 2023

Aims. The BL Lac 1ES 2344 +514 is known for temporary extreme properties characterised by a shift of the synchrotron spectral energy distribution (SED) peak energy nu(synch.p) above 1 keV. While those extreme states have only been observed…

Constraints to axion-like particles with the Perseus Galaxy Cluster with MAGIC Open

Giacomo D’Amico, Hyuga Abe, Shotaro Abe, J. Abhir, V. A. Acciari , et al. · 2023

Axion-like particles (ALPs) are pseudo-Nambu-Goldston bosons that appear in theories beyond the standard model and are capable of converting to photons in the presence of magnetic fields. Such interaction can have an observable effect on t…

New constraints on Lorentz invariance violation using the extraordinary flare of Mrk 421 in 2014 Open

Giacomo D’Amico, Hyuga Abe, Shotaro Abe, J. Abhir, V. A. Acciari , et al. · 2023

An extraordinary flare from blazar Mrk 421 was recorded on the night of April 24, 2014, by the Major Atmospheric Gamma Imaging Cherenkov (MAGIC) telescopes at very high energy (VHE) from 100 GeV up to 10 TeV. Several quantum-gravity models…

Update on the performance of the MAGIC Intensity Interferometer Open

Irene Jiménez Martínez, V. A. Acciari, Alejo Cifuentes, E. Colombo, J. Cortina , et al. · 2023

In recent years, the MAGIC telescopes have been equipped with a setup that allows its Imaging Atmospheric Cherenkov Telescopes (IACTs) to function as an Intensity Interferometer. The deadtime-free setup includes a 4-channel GPU-based real-…

The Real Time Analysis framework of the Cherenkov Telescope Array's Large-Sized Telescope Open

Sami Caroff, Kazuki Abe, Shotaro Abe, Arnau Aguasca-Cabot, I. Agudo , et al. · 2023

The Large-Sized Telescopes (LSTs) of the Cherenkov Telescope Array\nObservatory (CTAO) will play a crucial role in the study of transient gamma-ray\nsources, such as gamma-ray bursts and flaring active galactic nuclei. The low\nenergy thre…

MAGIC Upper Limits on the VHE emission from Flat Spectrum Radio Quasars Open

H. A. Mondal, Hyuga Abe, Shotaro Abe, J. Abhir, V. A. Acciari , et al. · 2023

Blazars are a class of active galactic nuclei (AGN) where the relativistic jet is pointed towards the observer. They are powerful sources of non-thermal radiation from radio to Very high energy(VHE) gamma-rays. Flat Spectrum Radio Quasars …

The broadband 3-year monitoring of the blazar 1ES1959+650: a SED analysis of the low state Open

C. Nanci, Hyuga Abe, Shotaro Abe, J. Abhir, V. A. Acciari , et al. · 2023

The Spectral Energy Distribution (SED) of blazars consists of two components. The low-energy\nbump is interpreted as synchrotron radiation from accelerated electrons, while the high-energy\none is produced via inverse Compton scattering of…

Highlights of Galactic Science with the MAGIC telescopes Open

M. Strzys, Hyuga Abe, Shotaro Abe, J. Abhir, V. A. Acciari , et al. · 2023

There are several types of Galactic sources that can potentially accelerate charged particles up to GeV and TeV energies. These accelerated particles can produce Very High Energy (E>100 GeV) gamma-ray emission through different non-thermal…

Improvement of the follow-up observations of IceCube neutrinos by CTA LST Open

K. Noda, Francesco Gabriele Saturni, Kazuki Abe, Shotaro Abe, Arnau Aguasca-Cabot , et al. · 2023

A decade has passed since high-energy astrophysical neutrinos have been discovered by IceCube, however the corresponding sources have not been fully identified yet. The reported coincidence of the high-energy IceCube-170922A with the gamma…

First results of pulsar observations with the LST-1 Open

Alvaro Mas-Aguilar, Francesco Gabriele Saturni, Kazuki Abe, Shotaro Abe, Arnau Aguasca-Cabot , et al. · 2023

After the discovery of Crab, Vela, and Geminga pulsars at Very High Energies, the search for\nnew pulsars at tens of GeV has been gaining huge importance. However, their steep spectra\nalong with the sensitivity of the current generation o…

Long-term study of the intermittent extreme behaviour of 1ES 2344+514 Open

Axel Arbet-Engels, WeiKang Zheng, A. V. Filippenko, C. Leto, C. M. Raiteri , et al. · 2023

Extreme high-frequency-peaked BL Lac objects (EHBLs) are the most energetic persistent sources in the universe. They are characterized by a spectral energy distribution (SED) featuring a synchrotron peak energy above 1 keV. 1ES 2344+514 is…

Performance of the Large-Sized Telescope prototype of the Cherenkov Telescope Array Open

Daniel Morcuende, Kazuki Abe, Shotaro Abe, Arnau Aguasca-Cabot, I. Agudo , et al. · 2023

The next-generation ground-based gamma-ray Cherenkov Telescope Array\nObservatory (CTAO) will consist of imaging atmospheric Cherenkov telescopes\n(IACTs) of three different sizes distributed in two sites. The Large-Sized\nTelescopes will …

First Science Results from CTA LST-1 Telescope and status of LST-2-4 Open

D. Mazin, Kazuki Abe, Shotaro Abe, Arnau Aguasca-Cabot, I. Agudo , et al. · 2023

The prototype Large-Sized Telescope (LST-1) of the Cherenkov Telescope Array (CTA) was inaugurated on La Palma, Canary Islands, in 2018. Since then, the telescope is in the commissioning phase and takes regular gamma-ray data on astrophysi…

Observation of Active Galactic Nuclei with the Large-Sized Telescope prototype of the Cherenkov Telescope Array Open

Ryuji Takeishi, Kazuki Abe, Shotaro Abe, Arnau Aguasca-Cabot, I. Agudo , et al. · 2023

Cherenkov Telescope Array (CTA) will be the next generation gamma-ray observatory. It\nwill consist of three different sizes of telescopes, with a collective improvement of about an order of magnitude in sensitivity, compared with the curr…

Long term study of the blazar S5 0716+714: investigating a turbulent jet at all wavelengths Open

F. Podobnik, Hyuga Abe, Shotaro Abe, J. Abhir, V. A. Acciari , et al. · 2023

The blazar S5 0716+714 is an intermediate BL Lacertae object remarkable for its variability in\nmany energy bands. It was discovered by MAGIC in the very-high-energy (VHE) gamma-ray\nrange in 2008. Later in 2015 an impressive electric vect…

Gamma-ray Spectral Line emission search from Dark Matter Annihilation up to 100 TeV towards the Galactic Centre with MAGIC Open

Tomohiro Inada, Hyuga Abe, Shotaro Abe, J. Abhir, V. A. Acciari , et al. · 2023

The detection of line-like TeV gamma-ray features configures as a smoking gun for the discovery of TeV-scale particle dark matter. We report the first search for dark matter spectral lines in the Galactic Centre region up to gamma-ray ener…

Defining the data legacy of the MAGIC telescopes: adopting a standardised data format and open-source analysis tools Open

Cosimo Nigro, Hyuga Abe, Shotaro Abe, J. Abhir, V. A. Acciari , et al. · 2023

Very-high-energy (VHE, $E > 100\\,{\\rm GeV}$) gamma-ray telescopes have traditionally conducted science with proprietary data and software. After two decades of operations, they have accumulated thousands of hours of observations whose fu…

Galactic Center Studies with CTA-LST-1 Open

Shotaro Abe, Kazuki Abe, Arnau Aguasca-Cabot, I. Agudo, Nuria Álvarez Crespo , et al. · 2023

The Galactic Center region is known to host a wide variety of very-high-energy gamma-ray sources. In 2018 the prototype of the Large-Sized Telescope (LST-1) for CTA was inaugurated, and has been regularly observing the Galactic Center sinc…

Characterization of SiPM and development of test bench modules for the next-generation cameras for Large-Sized Telescopes for Cherenkov Telescope Array Open

T. Saito, Kazuki Abe, Shotaro Abe, Arnau Aguasca-Cabot, I. Agudo , et al. · 2023

The recent improvements in the performance of the silicon photomultipliers (SiPMs) made them attractive options as photo sensors of imaging atmospheric Cherenkov telescopes (IACTs). In fact, they are already adopted in some IACTs such as F…

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