Black holes in microquasars can launch powerful relativistic jets, that can travel up to several parsecs from the compact object and interact with the interstellar medium. Recently, the detection of large-scale ultra-high-energy gamma-ray emission around black hole transient V4641 Sgr and other BH-jet systems suggested that jets from microquasars may play an important role in the production of...
The Large High Altitude Air Shower Observatory (LHAASO) is a mega facility designed to investigate cosmic rays and gamma rays at very-high (VHE; E > 0.1 TeV) and ultra-high energies (UHE; E > 0.1 PeV). In its initial years of operation, LHAASO has detected more than 100 gamma-ray sources, with approximately half constituting a newly emerging population of UHE gamma-ray emitters. Among these...
Cygnus X-3 is a microquasar consisting of a compact object of unknown nature and a Wolf-Rayet star, which orbit each other with a period of 4.8 hours. The compact object launches powerful jets that are an excellent site for particle acceleration up to relativistic energies. The presence of these relativistic particles, combined with the proximity to the star and its high luminosity, create a...
The recent discovery of ultra-high-energy gamma-ray emission from a set of five Galactic microquasars by the LHAASO collaboration has significantly strengthened the case for this class of sources as potential accelerators of cosmic rays up to the knee region of the spectrum. This breakthrough opens a completely new window for studying the mechanisms of particle acceleration in binary systems...
The origin of the cosmic-ray spectrum measured at Earth remains one of the biggest mysteries in high-energy astrophysics. Microquasar jets have long been proposed as sites for particle acceleration to TeV and PeV energies, and experimental evidence supporting such claims is mounting. In my talk I will review the recent observational results and their implications. I will also briefly discuss...
Microquasars are galactic binary systems that exhibit relativistic jets
whose composition remains uncertain. If protons are present in situ,
neutrino production becomes possible. The relative proximity of
these systems and the evidence of their high-energy emissions
documented in the literature make neutrinos good candidates for
addressing the question of jet composition and...
