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Multiwavelength signatures of shocks in relativistic jets
(HEASA, 2016)
Mildly relativistic, oblique shocks are frequently invoked as possible sites of relativistic particle
acceleration and production of strongly variable, polarized multi-wavelength emission from
relativistic jet sources ...
The effects of EBL inhomogeneity on the gamma-gamma absorption of VHE gamma-rays
(HEASA, 2016)
Very High Energy Gamma Rays (VHE; more than 100 GeV) from Cosmological Gamma Ray
Sources such as blazars can be absorbed by the Extragalactic Background light (EBL), which
leads to a high-energy cut-off in blazar spectral ...
Studies of relativistic jets in active galactic nuclei with SKA
(Sissa Medialab, 2014)
Relativistic jets in active galactic nuclei (AGN) are among the most powerful astrophysical objects
discovered to date. Indeed, jetted AGN studies have been considered a prominent science case for
SKA, and were included ...
Studies of optical/gamma-ray flares of blazar 4C+01.02: recent updates from the 2016-2017 observations
(Sissa Medialab, 2017)
The flat spectrum radio quasar 4C +01.02 became one of the brightest active galactic nuclei detected at high redshift (z = 2.1) in gamma rays when it underwent a series of outbursts during several months in 2016. We monitored ...
Multi-wavelength observations of flaring blazars with ATOM and Fermi-LAT
(Sissa Medialab, 2017)
The Automatic Telescope for Optical Monitoring is a 75cm optical telescope located at the H.E.S.S. site in Namibia. Since 2005, it monitors around 250 gamma-ray emitting AGN and has observed numerous blazar flares in several ...
Why the universe is unexpectedly transparent to very high energy gamma rays
(Sissa Medialab, 2017)
Recent observations of distant gamma ray sources indicate that the universe may be more transparent to VHE-gamma-rays than expected. In this paper we study the reduction of the EBL gamma-gamma opacity due to the existence ...
The dependence of optical polarisation of blazars on the synchrotron peak frequency
(PoS, 2017)
The RoboPol instrument and the relevant program was developed in order to conduct a systematic
study of the optical polarisation variability of blazars. Driven by the discovery that long smooth
rotations of the optical ...
Challenges in reconciling observations and theory of the brightest high-energy flare ever of 3C 279
(PoS, 2017)
Recent high-energy missions have allowed keeping watch over blazars in flaring states, which
provide deep insights into the engine powered by supermassive black holes. However, having
a quasar caught in a very bright ...
On the underlying particles in the jet of 3C 279
(PoS, 2017)
Recent high-energy missions have allowed keeping watch over blazars in flaring states, which
provide deep insights into the engine powered by supermassive black holes. However, having
a blazar caught in a very bright ...
ThunderKAT: the MeerKAT large survey project for image-plane radio transients
(Sissa Medialab, 2016)
ThunderKAT is the image-plane transients programme for MeerKAT.
The goal as outlined in 2010, and still today, is to find, identify and understand high-energy
astrophysical processes via their radio emission (often in ...