The exploration of the universe has recently entered a new era thanks to the multi-
messenger paradigm, characterized by a continuous increase in the quantity and quality of …

The discovery of high-energy astrophysical neutrinos and the first hints of coincident
electromagnetic and neutrino emissions opened new opportunities in multi-messenger …

The observation of electromagnetic radiation from radio to γ-ray wavelengths has provided a
wealth of information about the Universe. However, at PeV (10 15 eV) energies and above …

Astrophysical neutrinos are excellent probes of astroparticle physics and high-energy
physics. With energies far beyond solar, supernovae, atmospheric, and accelerator …

While active galactic nuclei with relativistic jets have long been prime candidates for the
origin of extragalactic cosmic rays and neutrinos, the BL Lac object TXS 0506+ 056 is the …

Abstract The ASTRI (Astrofisica con Specchi a Tecnologia Replicante Italiana) Project led by
the Italian National Institute for Astrophysics (INAF) is developing and will deploy at the …

We present evidence that TXS 0506+ 056, the first plausible non-stellar neutrino source,
despite appearances, is not a blazar of the BL Lac type but is instead a masquerading BL …

We investigate whether the emission of neutrinos observed in 2014–2015 from the direction
of the blazar TXS 0506+ 056 can be accommodated with leptohadronic multiwavelength …

Context. Identifying the most likely sources for high-energy neutrino emission has been one
of the main topics in high-energy astrophysics ever since the first observation of high-energy …

We present a procedure to generally constrain the environments of neutrino-producing sites
in photomeson production models of jetted active galactic nuclei (AGNs) where any origin of …