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Search for Periodic Variability in -ray Blazars Using \textit{Fermi}-LAT
P. Peñil, M. Ajello, S. Buson +5
Blazars are known to exhibit variability across a broad range of timescales. This behavior can include periodicity in their -ray emission, whose clear detection remains an ongoi…
Beginning a journey across the universe: the discovery of extragalactic neutrino factories
Sara Buson, Andrea Tramacere, Leonard Pfeiffer +4
Neutrinos are the most elusive particles in the Universe, capable of traveling nearly unimpeded across it. Despite the vast amount of data collected, a long standing and unsolved i…
The isotropic -ray emission above 100 GeV: where do very high energy rays come from?
Raniere de Menezes, Raffaele D'Abrusco, Francesco Massaro +1
Astrophysical sources of very high energy (VHE; GeV) rays are rare, since GeV and TeV photons can be only emitted in extreme circumstances involving interactions of rela…
Search for new cosmic-ray acceleration sites within the 4FGL catalog Galactic plane sources
LAT Collaboration, S. Abdollahi, F. Acero +117
Cosmic rays are mostly composed of protons accelerated to relativistic speeds. When those protons encounter interstellar material, they produce neutral pions which in turn decay in…
A Gamma-ray Pulsar Timing Array Constrains the Nanohertz Gravitational Wave Background
M. Ajello, W. B. Atwood, L. Baldini +129
After large galaxies merge, their central supermassive black holes are expected to form binary systems whose orbital motion generates a gravitational wave background (GWB) at nanoh…
Observing the inner parsec-scale region of candidate neutrino-emitting blazars
Cristina Nanci, Marcello Giroletti, Monica Orienti +14
Context. Many questions on the nature of astrophysical counterparts of high-energy neutrinos remain unanswered. There is increasing evidence of a connection between blazar jets and…