Explanipedia

Prospects for dark matter observations in dwarf spheroidal galaxies with the Cherenkov Telescope Array Observatory Open

K. Abe, Shinsuke Abe, J. Abhir, A. Abhishek, F. Acero , et al. · 2025

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…

VHE γ-ray observations of bright BL Lacs with the Large-Sized Telescope prototype (LST-1) of the CTAO Open

K. Abe, S. Abe, A. Abhishek, F. Acero, Arnau Aguasca-Cabot , et al. · 2025

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…

VHE $γ$-ray observations of bright BL Lacs with the Large-Sized Telescope prototype (LST-1) of the CTAO Open

The CTAO-LST Project, S. Abe, K. Abe, S. Abe, Arnau Aguasca-Cabot , et al. · 2025

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…

Constraining the TeV gamma-ray emission of SN 2024bch, a possible type IIn-L from a red supergiant progenitor Open

K. Abe, S. Abe, A. Abhishek, F. Acero, Arnau Aguasca-Cabot , et al. · 2025

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 optical calibration system for the CTAO-South Large-Sized Telescope camera Open

Michele Palatiello, Marco Mastrofini, Andrea Busatta, F. Lucarelli, F. Dazzi , et al. · 2025

X-Ray Polarization Detection of the Pulsar Wind Nebula in G21.5–0.9 with IXPE Open

Niccolò Di Lalla, N. Omodei, N. Bucciantini, Jack T. Dinsmore, Nicolò Cibrario , et al. · 2025

We present the X-ray polarization observation of G21.5−0.9, a young Galactic supernova remnant (SNR), conducted with the Imaging X-ray Polarimetry Explorer (IXPE) in 2023 October, with a total livetime of approximately 837 ks. Using differ…

Very high energy observations of the Seyfert galaxy NGC 4151 with MAGIC Open

S. Abe, J. Abhir, A. Abhishek, V.A. Acciari, Arnau Aguasca-Cabot , et al. · 2025

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 …

GRB 221009A: Observations with LST-1 of CTAO and Implications for Structured Jets in Long Gamma-Ray Bursts Open

K. Abe, S. Abe, A. Abhishek, F. Acero, Arnau Aguasca-Cabot , et al. · 2025

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…

Very-high-energy observations of the Seyfert galaxy NGC 4151 with MAGIC -- Indication of another gamma-ray obscured candidate neutrino source Open

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

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…

IXPE Observations of the Blazar Mrk 501 in 2022: A Multiwavelength View Open

Lindsey Lisalda, Ephraim Gau, H. Krawczynski, F. Tavecchio, Ioannis Liodakis , et al. · 2025

The blazar Markarian 501 (Mrk 501) was observed on three occasions over a 4-month period between 2022 March and 2022 July with the Imaging X-ray Polarimetry Explorer (IXPE). In this paper, we report for the first time on the third IXPE obs…

IXPE Observations of the Blazar Mrk 501 in 2022: A Multiwavelength View Open

Lindsey Lisalda, Ephraim Gau, H. Krawczynski, F. Tavecchio, I. Liodakis , et al. · 2025

The blazar Markarian 501 (Mrk 501) was observed on three occasions over a 4-month period between 2022 March and 2022 July with the Imaging X-ray Polarimetry Explorer (IXPE). In this paper, we report for the first time on the third IXPE obs…

Testing the ubiquitous presence of very high energy emission in gamma-ray bursts with the MAGIC telescopes Open

S. Abe, J. Abhir, A. Abhishek, V. A. Acciari, Arnau Aguasca-Cabot , et al. · 2025

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…

Testing the ubiquitous presence of very high energy emission in gamma-ray bursts with the MAGIC telescopes Open

S. Abe, J. Abhir, A. Abhishek, V.A. Acciari, Arnau Aguasca-Cabot , et al. · 2025

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…

A Two-week IXPE Monitoring Campaign on Mrk 421 Open

W. Peter Maksym, Ioannis Liodakis, M. Lynne Saade, Dawoon E. Kim, R. Middei , et al. · 2025

X-ray polarization is a unique new probe of the particle acceleration in astrophysical jets made possible through the Imaging X-ray Polarimetry Explorer. Here we report on the first dense X-ray polarization monitoring campaign on the blaza…

Detection of the Geminga pulsar at energies down to 20 GeV with the LST-1 of CTAO Open

K. Abe, S. Abe, A. Abhishek, F. Acero, Arnau Aguasca-Cabot , et al. · 2025

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…

High Optical-to-X-Ray Polarization Ratio Reveals Compton Scattering in BL Lacertae’s Jet Open

I. Agudo, Ioannis Liodakis, Jorge Otero-Santos, R. Middei, Alan P. Marscher , et al. · 2025

Blazars, supermassive black hole systems with highly relativistic jets aligned with the line of sight, are the most powerful long-lived emitters of electromagnetic emission in the Universe. We report here on a radio-to-gamma-ray multiwavel…

Galactic transient sources with the Cherenkov Telescope Array Observatory Open

K. Abe, S. Abe, J. Abhir, A. Abhishek, F. Acero , et al. · 2025

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-…

Erratum: “AGILE Gamma-Ray Detection of the Exceptional GRB 221009A” (2023, ApJL, 956, L23) Open

M. Tavani, G. Piano, A. Bulgarelli, L. Foffano, A. Ursi , et al. · 2025

X-Ray Polarization of the High-synchrotron-peak BL Lacertae Object 1ES 1959+650 during Intermediate and High X-Ray Flux States Open

L. Pacciani, Dawoon E. Kim, R. Middei, Herman L. Marshall, Alan P. Marscher , et al. · 2025

We report the Imaging X-ray Polarimetry Explorer (IXPE) polarimetric and simultaneous multiwavelength observations of the high-energy-peaked BL Lacertae object (HBL) 1ES 1959+650, performed in 2022 October and 2023 August. In 2022 October,…

Very high-energy gamma-ray detection and long-term multiwavelength view of the flaring blazar B2 1811+31 Open

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

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 …

Insights from the first flaring activity of a high synchrotron peaked blazar with X-ray polarization and VHE gamma rays Open

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

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 …

Detection of RS Oph with LST-1 and modelling of its HE/VHE gamma-ray emission Open

K. Abe, S. Abe, A. Abhishek, F. Acero, Arnau Aguasca-Cabot , et al. · 2025

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)…

IXPE observation of the low-synchrotron peaked blazar S4 0954+65 during an optical-X-ray flare Open

Pouya M. Kouch, Ioannis Liodakis, Francesco Fenu, Haocheng Zhang, Stella Boula , et al. · 2025

The X-ray polarization observations, made possible with the Imaging X-ray Polarimetry Explorer (IXPE), offer new ways of probing high-energy emission processes in astrophysical jets from blazars. Here, we report the first X-ray polarizatio…

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…

Time-dependent modelling of short-term variability in the TeV-blazar VER J0521+211 during the major flare in 2020 Open

S. Abe, J. Abhir, A. Abhishek, V. A. Acciari, Arnau Aguasca-Cabot , et al. · 2025

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…

Cosmic-ray acceleration and escape from supernova remnant W44 as probed by Fermi-LAT and MAGIC Open

Stanley K. Abe, J. Abhir, A. Abhishek, V. A. Acciari, Arnau Aguasca-Cabot , et al. · 2025

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…

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

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. We aim to characterize the multiwavelength behavior during this exceptional year for Mrk 421…

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…

Environmental credit products: Where do we stand? A response from an academic content analysis Open

Pina Murè, Saverio Giorgio, L. A. Antonelli, Lucilla Bittucci · 2024

Cosmic-ray acceleration and escape from supernova remnant W44 as probed by <i>Fermi</i>-LAT and MAGIC Open

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

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…

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