When astrophysical jets were discovered one hundred years ago, the field of numerical
simulations did not yet exit. Since the arrival of programmable computers though, numerical …

Relativistic jets of active galactic nuclei have been known to exist for 100 years. Blazars with
their jet pointing close to our line of sight are some of the most variable and extreme objects …

ABSTRACT The Nuclear Spectroscopic Telescope Array (NuSTAR) mission, launched on
2012 June 13, is the first focusing high-energy X-ray telescope in orbit. NuSTAR operates in …

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 extragalactic background light (EBL) is of fundamental importance both for
understanding the entire process of galaxy evolution and for γ-ray astronomy, but the overall …

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 …

Current Cherenkov telescopes have identified a population of ultra-high-frequency peaked
BL Lac objects (UHBLs), also known as extreme blazars, that exhibit exceptionally hard TeV …

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 …

The relativistic wind of obliquely rotating pulsars consists of toroidal stripes of opposite
magnetic field polarity, separated by current sheets of hot plasma. By means of two-and …

It is widely accepted that strong and variable radiation detected over all accessible energy
bands in a number of active galaxies arises from a relativistic, Doppler-boosted jet pointing …