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 …

Radio Galaxies have by now emerged as a new γ-ray emitting source class on the
extragalactic sky. Given their remarkable observed characteristics, such as unusual gamma …

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 the black hole accretion code (BHAC), a new multidimensional general-
relativistic magnetohydrodynamics module for the MPI-AMRVAC framework. BHAC has …

We investigate whether the emission of neutrinos observed in 2014–2015 from the direction
of the blazar TXS 0506+ 056 can be accommodated with leptohadronic multiwavelength …

Supermassive black holes with masses of millions to billions of solar masses are commonly
found in the centers of galaxies. Astronomers seek to image jet formation using radio …

The giant radio galaxy M 87 provides a unique environment to study relativistic plasma
outflows and the surroundings of supermassive black holes (SMBHs). Its prominent jet …

It is proposed that the variable TeV emission observed in M87 may be produced in a starved
magnetospheric region, above which the outflow associated with the VLBA jet is …

ABSTRACT We report on 230 GHz (1.3 mm) very long baseline interferometry (VLBI)
observations of M87 with the Event Horizon Telescope using antennas on Mauna Kea in …

Despite the uncovered association of a high-energy neutrino with the apparent flaring state
of blazar TXS 0506+ 056 in 2017, the mechanisms leading to astrophysical particle …