BL Lac objects are active nuclei, hosted in massive elliptical galaxies, the emission of which
is dominated by a relativistic jet closely aligned with the line of sight. This implies the …

Over the past few decades, our knowledge of jets produced by active galactic nuclei (AGN)
has greatly progressed thanks to the development of very-long-baseline interferometry …

We analyze the parsec-scale jet kinematics from 2007 June to 2013 January of a sample of
γ-ray bright blazars monitored roughly monthly with the Very Long Baseline Array at 43 GHz …

We present the Black Hole Explorer (BHEX), a mission that will produce the sharpest images
in the history of astronomy by extending submillimeter Very-Long-Baseline Interferometry …

Using microwaves to treat metal-based materials is rapidly emerging as an energy-efficient
tool to interact with metals for a number of processes such as sintering, melting, brazing …

We analyze the multi-frequency behavior of the quasar 3C 454.3 during three prominent γ-
ray outbursts: 2009 Autumn, 2010 Spring, and 2010 Autumn. The data reveal a repeating …

We combine time-dependent multi-waveband flux and linear polarization observations with
submilliarcsecond-scale polarimetric images at λ= 7 mm of the BL Lacertae type blazar …

The exact location of the γ-ray emitting region in blazars is still controversial. In order to
attack this problem we present first results of a cross-correlation analysis between radio (11 …

Markarian 421 (Mrk 421 hereafter) is a nearby active galaxy with a featureless optical
spectrum devoid of prominent emission or absorption lines, strongly polarized variable …

We present time-resolved broadband observations of the quasar 3C 279 obtained from multi-
wavelength campaigns conducted during the first two years of the Fermi Gamma-ray Space …