Istituto Nazionale di Fisica Nucleare, Sezione di Padova

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…

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…

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…

Precision spectral measurements of Chromium and Titanium from 10 to 250 GeV $/ n$ and sub-Iron to Iron ratio with the Calorimetric Electron Telescope on the ISS

O. Adriani, Y. Akaike, K. Asano +77

The Calorimetric Electron Telescope (CALET), in operation on the International Space Station since 2015, collected a large sample of cosmic-ray (CR) iron and sub-iron events over a…

astro-ph.HE2025★ 4 cited

Transient QPOs of Fermi-LAT blazars under the Curved Jet Model

P. Penil, J. Otero-Santos, A. Banerjee +4

This study explores transient quasi-periodic oscillations (QPOs) in the $γ$ -ray emission of two blazars, PMN J0531 $-$ 4827 and PKS 1502+106, using over a decade of Fermi Large Area…

astro-ph.HE2025★ 9 cited

Determining the origin of the X-ray emission in blazars through multiwavelength polarization

Ioannis Liodakis, Haocheng Zhang, Stella Boula +48

The origin of the high-energy emission in astrophysical jets from black holes is a highly debated issue. This is particularly true for jets from supermassive black holes that are a…

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

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

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 t…

Jet-environment interaction after delayed collapse in binary neutron star mergers

Jay V. Kalinani, Riccardo Ciolfi, Manuela Campanelli +4

We present general relativistic magnetohydrodynamic simulations of binary neutron star (BNS) mergers, where the collapse of the metastable massive neutron star (MNS) remnant leads…

astro-ph.HE2025★ 2 cited

Puzzling Variation of Gamma Rays from the Sun over the Solar Cycle Revealed with Fermi-LAT

A. Acharyya, A. Adelfio, M. Ajello +100

The steady-state gamma-ray emission from the Sun is thought to consist of two emission components due to interactions with Galactic cosmic rays: (1) a hadronic disk component, and…

astro-ph.HE2025★ 8 cited

X-ray Polarization of the High-Synchrotron-Peak BL Lacertae Object 1ES 1959+650 during Intermediate and High X-ray Flux States

Luigi Pacciani, Dawoon E. Kim, Riccardo Middei +97

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

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

K. Abe, S. Abe, J. Abhir +231

Among the blazars whose emission has been detected up to very-high-energy (VHE; 100 GeV < E < 100 TeV) gamma rays, intermediate synchrotron-peaked BL Lacs (IBLs) are quite rare. Th…

Accelerating LISA inference with Gaussian processes

Jonas El Gammal, Riccardo Buscicchio, Germano Nardini +1

Source inference for deterministic gravitational waves is a computationally demanding task in LISA. In a novel approach, we investigate the capability of Gaussian Processes to lear…