J. A. Barrio
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View article: Prospects for dark matter observations in dwarf spheroidal galaxies with the Cherenkov Telescope Array Observatory
Prospects for dark matter observations in dwarf spheroidal galaxies with the Cherenkov Telescope Array Observatory Open
The dwarf spheroidal galaxies (dSphs) orbiting the Milky Way are widely regarded as systems supported by velocity dispersion against self-gravity, and as prime targets for the search for indirect dark matter (DM) signatures in the GeV-to-T…
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: 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 GeV up to 300 TeV, with two sites in La Palma (Spain) and Paranal (Chile). It will consist of tele…
View article: Constraining the TeV gamma-ray emission of SN 2024bch, a possible type IIn-L from a red supergiant progenitor
Constraining the TeV gamma-ray emission of SN 2024bch, a possible type IIn-L from a red supergiant progenitor Open
We present very high-energy optical photometry and spectroscopic observations of SN 2024bch in the nearby galaxy NGC 3206 (∼20 Mpc). We used gamma-ray observations performed with the first Large-Sized Telescope (LST-1) of the Cherenkov Tel…
The design of NectarCAM, a camera for the Medium-Sized Telescopes of CTAO Open
NectarCAM is a Cherenkov camera which will equip the Medium-Sized Telescopes (MST) of the northern site of the Cherenkov Telescope Array Observatory (CTAO). This contribution presents the hardware design of NectarCAM. The camera has a modu…
View article: Very high energy observations of the Seyfert galaxy NGC 4151 with MAGIC
Very high energy observations of the Seyfert galaxy NGC 4151 with MAGIC Open
Seyfert galaxies are emerging as a promising source class of high-energy neutrinos. The Seyfert galaxies NGC 4151 and NGC 1068 have respectively come up as the most promising counterparts of a 3 σ and of a 4.2 σ neutrino excesses detected …
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: Very-high-energy observations of the Seyfert galaxy NGC 4151 with MAGIC -- Indication of another gamma-ray obscured candidate neutrino source
Very-high-energy observations of the Seyfert galaxy NGC 4151 with MAGIC -- Indication of another gamma-ray obscured candidate neutrino source Open
Seyfert galaxies are emerging as a promising source class of high-energy neutrinos. The Seyfert galaxies NGC 4151 and NGC 1068 have come up respectively as the most promising counterparts of a 3$σ$ and of a 4.2$σ$ neutrino excesses detecte…
View article: Testing the ubiquitous presence of very high energy emission in gamma-ray bursts with the MAGIC telescopes
Testing the ubiquitous presence of very high energy emission in gamma-ray bursts with the MAGIC telescopes Open
Gamma-ray bursts (GRBs) are the most powerful transient objects in the Universe, and they are a primary target for the MAGIC Collaboration. Recognizing the challenges of observing these elusive objects with Imaging Atmospheric Cherenkov Te…
View article: Detection of the Geminga pulsar at energies down to 20 GeV with the LST-1 of CTAO
Detection of the Geminga pulsar at energies down to 20 GeV with the LST-1 of CTAO Open
Context. Geminga is the third gamma-ray pulsar firmly detected by imaging atmospheric Cherenkov telescopes (IACTs) after the Crab and the Vela pulsars. Most of its emission is expected at tens of giga-electronvolts, and, out of the planned…
View article: Galactic transient sources with the Cherenkov Telescope Array Observatory
Galactic transient sources with the Cherenkov Telescope Array Observatory Open
A wide variety of Galactic sources show transient emission at soft and hard X-ray energies: low- and high-mass X-ray binaries containing compact objects, isolated neutron stars exhibiting extreme variability as magnetars as well as pulsar-…
View article: Very high-energy gamma-ray detection and long-term multiwavelength view of the flaring blazar B2 1811+31
Very high-energy gamma-ray detection and long-term multiwavelength view of the flaring blazar B2 1811+31 Open
Context. Among the blazars whose emission has been detected up to very high-energy (VHE; 100 GeV< E <100 TeV) γ rays, intermediate synchrotron-peaked BL Lacs (IBLs) are quite rare. The IBL B2 1811+31 ( z = 0.117) exhibited intense flaring …
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: Insights from the first flaring activity of a high synchrotron peaked blazar with X-ray polarization and VHE gamma rays
Insights from the first flaring activity of a high synchrotron peaked blazar with X-ray polarization and VHE gamma rays Open
Context. Blazars exhibit strong variability across the entire electromagnetic spectrum, including periods of high-flux states commonly known as flares. The physical mechanisms in blazar jets responsible for flares remain poorly understood …
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: Characterization of Markarian 421 during its most violent year: Multiwavelength variability and correlations
Characterization of Markarian 421 during its most violent year: Multiwavelength variability and correlations Open
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…
View article: Time-dependent modelling of short-term variability in the TeV-blazar VER J0521+211 during the major flare in 2020
Time-dependent modelling of short-term variability in the TeV-blazar VER J0521+211 during the major flare in 2020 Open
The BL Lacertae object VER J0521+211 underwent a notable flaring episode in February 2020. A short-term monitoring campaign, led by the MAGIC (Major Atmospheric Gamma Imaging Cherenkov) collaboration, covering a wide energy range from radi…
View article: Insights from the first flaring activity of a high synchrotron peaked blazar with X-ray polarization and VHE gamma rays
Insights from the first flaring activity of a high synchrotron peaked blazar with X-ray polarization and VHE gamma rays Open
Context. Blazars exhibit strong variability across the entire electromagnetic spectrum, including periods of high-flux states commonly known as flares. The physical mechanisms in blazar jets responsible for flares remain poorly understood …
View article: Cosmic-ray acceleration and escape from supernova remnant W44 as probed by <i>Fermi</i>-LAT and MAGIC
Cosmic-ray acceleration and escape from supernova remnant W44 as probed by <i>Fermi</i>-LAT and MAGIC Open
Context. The supernova remnant (SNR) W44 and its surroundings are a prime target for studying the acceleration of cosmic rays (CRs). Several previous studies established an extended gamma-ray emission that is set apart from the radio shell…
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: Standardised formats and open-source analysis tools for the MAGIC telescopes data
Standardised formats and open-source analysis tools for the MAGIC telescopes data Open
This data set constitutes the first release of MAGIC telescopes data to the public. The data are produced according to the Data formats for gamma-ray astronomy (GADF) specifications, we recommend to examine the GADF documentation to become…
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: Prospects for γ-ray observations of the Perseus galaxy cluster with the Cherenkov Telescope Array
Prospects for γ-ray observations of the Perseus galaxy cluster with the Cherenkov Telescope Array Open
Galaxy clusters are expected to be both dark matter (DM) reservoirs and storage rooms for the cosmic-ray protons (CRp) that accumulate along the cluster's formation history. Accordingly, they are excellent targets to search for signals of …
View article: A detailed study of the very high-energy Crab pulsar emission with the LST-1
A detailed study of the very high-energy Crab pulsar emission with the LST-1 Open
Context. To date, three pulsars have been firmly detected by imaging atmospheric Cherenkov telescopes (IACTs). Two of them reached the TeV energy range, challenging models of very high-energy (VHE) emission in pulsars. More precise observa…
View article: Prospects for a survey of the galactic plane with the Cherenkov Telescope Array
Prospects for a survey of the galactic plane with the Cherenkov Telescope Array Open
Approximately one hundred sources of very-high-energy (VHE) gamma rays are known in the Milky Way, detected with a combination of targeted observations and surveys. A survey of the entire Galactic Plane in the energy range from a few tens …
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: Dark matter line searches with the Cherenkov Telescope Array
Dark matter line searches with the Cherenkov Telescope Array Open
Monochromatic gamma-ray signals constitute a potential smoking gun signature for annihilating or decaying dark matter particles that could relatively easily be distinguished from astrophysical or instrumental backgrounds. We provide an upd…
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: 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…