The last few years have seen gamma-ray astronomy maturing and advancing in the field of
time-domain astronomy, utilizing source variability on timescales over many orders of …

The recent hint of correlated γ-ray and neutrino emission from the blazar TXS 0506+ 056
has renewed interest in blazars as the source of high-energy neutrinos, in which the …

Very high energy (VHE) γ-ray emission from the flat spectrum radio quasar (FSRQ) PKS
1222+ 21 (4C 21.35, z= 0.432) was detected with the MAGIC Cherenkov telescopes during …

ABSTRACT Inverse Compton cascades (ICCs) initiated by energetic gamma rays (E≳ 100
GeV) enhance the GeV emission from bright, extragalactic TeV sources. The absence of this …

Supernova remnants exhibit shock fronts (shells) that can accelerate charged particles up to
very high energies. In the past decade, measurements of a handful of shell-type supernova …

The extragalactic background light (EBL) is the diffuse radiation with the second highest
energy density in the Universe after the cosmic microwave background. The aim of this study …

Axionlike particles (ALPs) are hypothetical light (sub-eV) bosons predicted in some
extensions of the Standard Model of particle physics. In astrophysical environments …

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 …

In an effort to locate the sites of emission at different frequencies and physical processes
causing variability in blazar jets, we have obtained high time-resolution observations of BL …

We present 23 new VLBA images of the six established TeV blazars Markarian 421,
Markarian 501, H 1426+ 428, 1ES 1959+ 650, PKS 2155− 304, and 1ES 2344+ 514 …