Cygnus X-3 and Other Ultra-High-Energy γ-Ray Sources

AGNs and microquasars as high energy γ-ray sources

The microquasar phenomenon has grown in prominence recently, as it has been found that most X-ray binaries show radio emission, associated with jets collimated beams of relativistic plasma. The ejection takes place in a bipolar way perpendicular to the accretion disk associated with the compact star, a black hole or a neutron star. The word microquasar itself was chosen by the analogy of these ...

The Radio : X-ray Correlation in Cygnus X-3 and Other Galactic Microquasars

Cygnus X-3, a Galactic X-ray binary, shows the presence of outflows in the form of radio jets. The SED in the X-ray band shows a complicated structure and evolution. We review some recent results of the long-term correlation of the radio and X-ray emissions, chiefly in the low (hard) states of the source. Comparing the results with those of other Galactic microquasars, we attempt to provide a c...

Ultra-High Energy Cosmic Ray Nuclei from Individual Magnetized Sources

We investigate the dependence of composition, spectrum and angular distributions of ultra-high energy cosmic rays above 10 eV from individual sources on their magnetization. We find that, especially for sources within a few megaparsecs from the observer, observable spectra and composition are severely modified if the source is surrounded by fields of ∼ 10 G on scales of a few megaparsecs. Low e...

Ultra-high energy cosmic rays, cascade γ-rays, and high-energy neutrinos from gamma-ray bursts

Gamma-ray bursts (GRBs) are sources of energetic, highly variable fluxes of γ rays, which demonstrates that they are powerful particle accelerators. Besides relativistic electrons, GRBs should also accelerate high-energy hadrons, some of which could escape cooling to produce ultra-high energy cosmic rays (UHECRs). Acceleration of high-energy hadrons in GRB blast waves will be established if hig...

Are Ultra Luminous X-Ray Sources Microblazars?