A. De Angelis
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View article: VHE γ-ray observations of bright BL Lacs with the Large-Sized Telescope prototype (LST-1) of the CTAO
VHE γ-ray observations of bright BL Lacs with the Large-Sized Telescope prototype (LST-1) of the CTAO Open
Cherenkov Telescope Array Observatory (CTAO) is the next-generation ground-based $\gamma$-ray observatory operating in the energy range from $20\, \mathrm{GeV}$ up to $300\, \mathrm{TeV}$, with two sites in La Palma (Spain) and Paranal (Ch…
View article: GRB 221009A: Observations with LST-1 of CTAO and Implications for Structured Jets in Long Gamma-Ray Bursts
GRB 221009A: Observations with LST-1 of CTAO and Implications for Structured Jets in Long Gamma-Ray Bursts Open
GRB 221009A is the brightest gamma-ray burst (GRB) observed to date. Extensive observations of its afterglow emission across the electromagnetic spectrum were performed, providing the first strong evidence of a jet with a nontrivial angula…
View article: Science Prospects for the Southern Wide-field Gamma-ray Observatory: SWGO
Science Prospects for the Southern Wide-field Gamma-ray Observatory: SWGO Open
Ground-based gamma-ray astronomy is now well established as a key observational approach to address critical topics at the frontiers of astroparticle physics and high-energy astrophysics. Whilst the field of TeV astronomy was once dominate…
View article: Combined search in dwarf spheroidal galaxies for branon dark matter annihilation signatures with the MAGIC telescopes
Combined search in dwarf spheroidal galaxies for branon dark matter annihilation signatures with the MAGIC telescopes Open
Massive brane fluctuations, called branons, behave as weakly interacting massive particles, which is one of the most favored class of candidates to fulfill the role of the dark matter (DM), an elusive kind of matter beyond the Standard Mod…
View article: Detection of RS Oph with LST-1 and modelling of its HE/VHE gamma-ray emission
Detection of RS Oph with LST-1 and modelling of its HE/VHE gamma-ray emission Open
Context. The recurrent nova RS Ophiuchi (RS Oph) underwent a thermonuclear eruption in August 2021. In this event, RS Oph was detected by the High Energy Stereoscopic System (H.E.S.S.), the Major Atmospheric Gamma Imaging Cherenkov (MAGIC)…
View article: Multiwavelength study of OT 081: broadband modelling of a transitional blazar
Multiwavelength study of OT 081: broadband modelling of a transitional blazar Open
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…
View article: A new method of reconstructing images of gamma-ray telescopes applied to the LST-1 of CTAO
A new method of reconstructing images of gamma-ray telescopes applied to the LST-1 of CTAO Open
Context . Imaging atmospheric Cherenkov telescopes (IACTs) are used to observe very high-energy photons from the ground. Gamma rays are indirectly detected through the Cherenkov light emitted by the air showers they induce. The new generat…
View article: Multi-wavelength study of OT 081: broadband modelling of a transitional blazar
Multi-wavelength study of OT 081: broadband modelling of a transitional blazar Open
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…
View article: Constraints on VHE gamma-ray emission of flat spectrum radio quasars with the MAGIC telescopes
Constraints on VHE gamma-ray emission of flat spectrum radio quasars with the MAGIC telescopes Open
Flat spectrum radio quasars (FSRQs) constitute a class of jetted active galaxies characterized by a very luminous accretion disc, prominent and rapidly moving line-emitting cloud structures (broad-line region, BLR), and a surrounding dense…
View article: Mind the Gap! Null Modals (and Other Functional Verbs) in Finite Complementation in Italo-Greek
Mind the Gap! Null Modals (and Other Functional Verbs) in Finite Complementation in Italo-Greek Open
Although Italo-Greek is characterized by a general retreat of infinitival complementation, it partly preserves the infinitive in restructuring contexts: a handful of functional auxiliaries—in an overt or covert form—allow for infinitival c…
View article: Constraints on Lorentz invariance violation from the extraordinary Mrk 421 flare of 2014 using a novel analysis method
Constraints on Lorentz invariance violation from the extraordinary Mrk 421 flare of 2014 using a novel analysis method Open
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…
View article: GRB 221009A observations with LST-1 at VHE gamma rays
GRB 221009A observations with LST-1 at VHE gamma rays Open
On October 9th, 2022, the brightest gamma-ray burst (GRB) since the first GRB observation in the late sixties was detected by the Fermi-GBM and Swift-BAT telescopes (GRB 221009A). The outstanding characteristics of this GRB triggered exten…
View article: Performance and first measurements of the MAGIC stellar intensity interferometer
Performance and first measurements of the MAGIC stellar intensity interferometer Open
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…
View article: Performance and first measurements of the MAGIC stellar intensity interferometer
Performance and first measurements of the MAGIC stellar intensity interferometer Open
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…
View article: The variability patterns of the TeV blazar PG 1553 + 113 from a decade of MAGIC and multiband observations
The variability patterns of the TeV blazar PG 1553 + 113 from a decade of MAGIC and multiband observations Open
PG 1553 + 113 is one of the few blazars with a convincing quasi-periodic emission in the gamma-ray band. The source is also a very high energy (VHE; >100 GeV) gamma-ray emitter. To better understand its properties and identify the under…
View article: Insights into the broadband emission of the TeV blazar Mrk 501 during the first X-ray polarization measurements
Insights into the broadband emission of the TeV blazar Mrk 501 during the first X-ray polarization measurements Open
Aims. We present the first multiwavelength study of Mrk 501 that contains simultaneous very-high-energy (VHE) γ -ray observations and X-ray polarization measurements from the Imaging X-ray Polarimetry Explorer (IXPE). Methods. We used radi…
View article: First characterization of the emission behavior of Mrk 421 from radio to very high-energy gamma rays with simultaneous X-ray polarization measurements
First characterization of the emission behavior of Mrk 421 from radio to very high-energy gamma rays with simultaneous X-ray polarization measurements Open
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…
View article: Insights into the broad-band emission of the TeV blazar Mrk 501 during the first X-ray polarization measurements
Insights into the broad-band emission of the TeV blazar Mrk 501 during the first X-ray polarization measurements Open
We present the first multi-wavelength study of Mrk 501 including very-high-energy (VHE) gamma-ray observations simultaneous to X-ray polarization measurements from the Imaging X-ray Polarimetry Explorer (IXPE). We use radio-to-VHE data fro…
View article: Constraints on axion-like particles with the Perseus Galaxy Cluster with MAGIC
Constraints on axion-like particles with the Perseus Galaxy Cluster with MAGIC Open
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 …
View article: First characterization of the emission behavior of Mrk421 from radio to VHE gamma rays with simultaneous X-ray polarization measurements
First characterization of the emission behavior of Mrk421 from radio to VHE gamma rays with simultaneous X-ray polarization measurements Open
We perform the first broadband study of Mrk421 from radio to TeV gamma rays with simultaneous measurements of the X-ray polarization from IXPE. The data were collected within an extensive multiwavelength campaign organized between May and …
View article: The Third Fermi Large Area Telescope Catalog of Gamma-Ray Pulsars
The Third Fermi Large Area Telescope Catalog of Gamma-Ray Pulsars Open
We present 294 pulsars found in GeV data from the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope. Another 33 millisecond pulsars (MSPs) discovered in deep radio searches of LAT sources will likely reveal pulsations once …
View article: MAGIC detection of GRB 201216C at<i>z</i> = 1.1
MAGIC detection of GRB 201216C at<i>z</i> = 1.1 Open
Gamma-ray bursts (GRBs) are explosive transient events occurring at cosmological distances, releasing a large amount of energy as electromagnetic radiation over several energy bands. We report the detection of the long GRB 201216C by the M…
View article: Performance of the joint LST-1 and MAGIC observations evaluated with Crab Nebula data
Performance of the joint LST-1 and MAGIC observations evaluated with Crab Nebula data Open
Aims. Large-Sized Telescope 1 (LST-1), the prototype for the Large-Sized Telescope at the upcoming Cherenkov Telescope Array Observatory, is concluding its commissioning phase at the Observatorio del Roque de los Muchachos on the island of…
View article: Observations of the Crab Nebula and Pulsar with the Large-sized Telescope Prototype of the Cherenkov Telescope Array
Observations of the Crab Nebula and Pulsar with the Large-sized Telescope Prototype of the Cherenkov Telescope Array Open
The Cherenkov Telescope Array (CTA) is a next-generation ground-based observatory for gamma-ray astronomy at very high energies. The Large-Sized Telescope prototype (LST-1) is located at the CTA-North site, on the Canary Island of La Palma…
View article: Constraints to axion-like particles with the Perseus Galaxy Cluster with MAGIC
Constraints to axion-like particles with the Perseus Galaxy Cluster with MAGIC Open
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…
View article: New constraints on Lorentz invariance violation using the extraordinary flare of Mrk 421 in 2014
New constraints on Lorentz invariance violation using the extraordinary flare of Mrk 421 in 2014 Open
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…
View article: The Supernova in Galileo’s Starry Sky and Its Impact on Astronomy
The Supernova in Galileo’s Starry Sky and Its Impact on Astronomy Open
In 1604, the last of the supernovae seen with the naked eye in the Milky Way had a great impact on the history of astronomy and cosmology. Scientists with different conceptions of the Universe - among them Galilei and Kepler but also Arab …
View article: Simulation of PeV atmospheric showers for SWGO
Simulation of PeV atmospheric showers for SWGO Open
The recent discovery of PeV gamma-ray emission especially from the LHAASO observatory, located in the Northern hemisphere, boosted the relevance of observing the Southern sky at such
\nenergies. SWGO (SouthernWide-Field Gamma-Ray Observato…
View article: The Mercedes water Cherenkov detector: a multi-PMT shallow tank design proposal for ground-based gamma-ray observatories
The Mercedes water Cherenkov detector: a multi-PMT shallow tank design proposal for ground-based gamma-ray observatories Open
We present the concept of a shallow, single-layer, multi-PMT water Cherenkov detector (WCD) unit for ground-based gamma-ray astronomy. The design was developed as part of the R&D activities for SWGO, as a candidate WCD unit solution for th…