Istituto Nazionale di Fisica Nucleare, Sezione di Padova

Revisiting EBL Constraints from Gamma-Ray Observations: A Critical Assessment and Methodological Improvements

K. Abe, S. Abe, J. Abhir +185

The extragalactic background light (EBL), ranging from the infrared to the ultraviolet bands, is the second most intense photon field in the universe, surpassed only by the cosmic…

Constraints on the VHE counterpart of two binary black hole mergers observed by the MAGIC and CTAO LST-1 telescopes

K. Abe, S. Abe, J. Abhir +358

We present very-high-energy gamma-ray observations of two binary black hole merger candidates, GW240615_113620 and GW241125_010116, performed with the Major Atmospheric Gamma Imagi…

Long-term study of the gamma-ray emission of Cygnus X-3 with MAGIC and Fermi-LAT

K. Abe, S. Abe, J. Abhir +185

Cygnus X-3 is a microquasar composed of a compact object of unknown nature closely orbiting around a Wolf-Rayet star. The particularities of this source make it a unique case among…

The January 2010 flare of Mrk421: Insights from a stochastic acceleration model

MAGIC collaboration, K. Abe, S. Abe +191

Mrk421 displayed its highest flux state ever observed in February of 2010 with very high TeV fluxes and interesting cross-band correlations and a spectral energy distribution (SED)…

Chasing Gamma-Ray Signals from Binary Neutron Star Coalescences with the Cherenkov Telescope Array: Prospects and Observing Strategies

S. Abe, J. Abhir, A. Abhishek +457

The detection of gravitational waves (GWs) from a binary neutron star (BNS) merger by Advanced LIGO and Advanced Virgo (GW170817), together with its electromagnetic counterpart, th…

Gravitational-Wave Signals for Supernova Explosions of Three-Dimensional Progenitors

Alessandro Lella, Giuseppe Lucente, Daniel Kresse +3

Core-collapse supernovae (SNe) are sources of gravitational waves (GWs) produced by hydrodynamical instabilities and highly time-dependent anisotropies of the neutrino radiation. I…

The second H.E.S.S. gamma-ray burst catalogue: 15 years of observations with the H.E.S.S. telescopes

A. Acharyya, F. Aharonian, C. Arcaro +143

Recent observational efforts using imaging atmospheric Cherenkov telescopes (IACTs) have led to firm detections of very-high-energy (VHE) signals from bright gamma-ray bursts (GRBs…

Constraining the synchrotron peak and estimating the VHE brightness of a sample of extreme high synchrotron peak blazars

Federica Sibani, Stefano Marchesi, Ettore Bronzini +5

We present the results of a multi-wavelength study of a population of X-ray bright ( $log (F_{0.2 - 12 keV}) > - 12.5$ ), non- $γ$ -ray detected high and extreme high synchrotron peak…

astro-ph.HE2026★ 3 cited

Estimatingthe Contribution of Galactic Neutrino Sources

Mohadeseh Ozlati Moghadam, Kathrin Egberts, Rowan Batzofin +2

The Milky Way hosts astrophysical accelerators capable of producing high-energy cosmic rays. These cosmic rays can interact with the interstellar medium (ISM) across the Galaxy to…

Optical spectral characterization of OP 313. Constraining the contribution of thermal and non-thermal optical emission

J. Otero-Santos, M. Nievas Rosillo, J. A. Acosta-Pulido +1

The quasar OP 313 was discovered in December 2023 in very-high-energy $γ$ rays above 100 GeV, enabling for the first time a complete characterization of its emission. However, the…

astro-ph.HE2026★ 2 cited

First detection of VHE gamma-ray signal from the FSRQ TON 0599

MAGIC Collaboration, K. Abe, S. Abe +245

TON\,0599 (z=0.7247) belongs to the few flat spectrum radio quasars (FSRQs) detected in the very high energy (VHE, $E > 100$ \,GeV) gamma-ray band. Its redshift makes it currently o…

Search for Diffuse Supernova Neutrino Background with 956.2 days of Super-Kamiokande Gadolinium Dataset

K. Abe, S. Abe, Y. Asaoka +245

We report the search result for the Diffuse Supernova Neutrino Background (DSNB) in neutrino energies beyond 9.3~MeV in the gadolinium-loaded Super-Kamiokande (SK) detector with $2…

Recasting and Forecasting Dark Matter Limits Without Raw Data: A Generalized Algorithm for Gamma-Ray Telescopes

Giacomo D'Amico, Michele Doro, Michela De Caria

We present a novel method for both forecasting and recasting upper limits (ULs) on dark matter (DM) annihilation cross sections, $⟨ σ v ⟩^{U L}$ , or decay lifetime $τ^{LL}…

1FLAT: a Firmamento-based catalog of AGN in Fermi-LAT high Galactic latitude γ-ray sources

P. Giommi, M. Doro, M. Gouvêa +15

We present a systematic reassessment of 5,062 high-Galactic latitude gamma-ray sources from the Fermi-LAT 4FGL-DR4 catalog using Firmamento, a web-based platform for multi-frequenc…

The very high energy view of gamma-ray bursts with the MAGIC telescopes

Alessio Berti, Željka Bošnjak, Alberto Castro-Tirado +22

Gamma-ray bursts (GRBs) are one of the main targets for the observations of the MAGIC telescopes. As a result of the effort in improving the sensitivity of the instrument and the a…

astro-ph.HE2025★ 2 cited

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

The CTAO-LST Project, :, K. Abe +331

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…

astro-ph.HE2025★ 3 cited

Optically thick winds of very massive stars suppress intermediate-mass black hole formation

Stefano Torniamenti, Michela Mapelli, Lumen Boco +3

Intermediate-mass black holes (IMBHs) are the link between stellar-mass and supermassive black holes. Gravitational waves have started unveiling a population of IMBHs in the $\sim…

Non-thermal emission in the central starburst region of M82

M. Persic, R. Rando, Y. Rephaeli

Diffuse non-thermal (NT) emission from the central starburst (CSB) of M82 has been measured at radio, X-ray and gamma-ray energies. Far-infrared (FIR), radio, and X-ray emission ma…

astro-ph.HE2025★ 5 cited

Combined dark matter search towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS

LAT Collaboration, S. Abdollahi, L. Baldini +586

Dwarf spheroidal galaxies (dSphs) are excellent targets for indirect dark matter (DM) searches using gamma-ray telescopes because they are thought to have high DM content and a low…

Constraining the TeV gamma-ray emission of SN 2024bch, a possible type IIn-L from a red supergiant progenitor. Multiwavelength observations and analysis of the progenitor

The CTAO-LST Project, :, K. Abe +332

We present very high-energy optical photometry and spectroscopic observations of SN 2024bch in the nearby galaxy NGC 3206 (\sim 20 Mpc). We used gamma-ray observations performed wi…

astro-ph.HE2025★ 3 cited

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

K. Abe, S. Abe, J. Abhir +491

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 sear…

The role of migration traps in the formation of binary black holes in AGN disks

Maria Paola Vaccaro, Yannick Seif, Michela Mapelli

Binary black holes (BBHs) forming in the accretion disks of active galactic nuclei (AGNs) represent a promising channel for gravitational-wave production. BBHs are often assumed to…

Broadband Modelling of GRB 230812B Afterglow: Implications for VHE $γ$ -ray Detection with IACTs

Shraddha Mohnani, Biswajit Banerjee, Davide Miceli +13

A significant fraction of the energy from the $γ$ -ray burst (GRB) jets, after powering the keV-MeV emission, forms an ultra-relativistic shock propagating into the circumburst medi…