Collimated outflows (jets) appear to be a ubiquitous phenomenon associated with the
accretion of material onto a compact object. Despite this ubiquity, many fundamental physics …

This review provides an overview of recent advances in multi-wavelength and multi-
messenger observations of blazars, the current status of theoretical models for blazar …

In magnetized astrophysical outflows, the dissipation of field energy into particle energy via
magnetic reconnection is often invoked to explain the observed non-thermal signatures. By …

The author presents a model for variability of the flux and polarization of blazars in which
turbulent plasma flowing at a relativistic speed down a jet crosses a standing conical shock …

The recent Fermi observation of GRB 080916C shows that the bright photosphere emission
associated with a putative fireball is missing, which suggests that the central engine likely …

Observations of gamma-ray-bursts and jets from active galactic nuclei reveal that the jet flow
is characterized by a high radiative efficiency and that the dissipative mechanism must be a …

Magnetic reconnection is thought to be the driver for many explosive phenomena in the
universe. The energy release and particle acceleration during reconnection have been …

Gas accretion onto some massive black holes (MBHs) at the centers of galaxies actively
powers luminous emission, but most MBHs are considered dormant. Occasionally, a star …

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 studied all blazars of known redshift detected by the Fermi satellite during its first 3-
month survey. For the majority of them, pointed Swift observations ensure a good …