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Radiation and polarization signatures of the 3D multizone time-dependent hadronic blazar model
(IOP Publishing, 2016)
We present a newly developed time-dependent three-dimensional multizone hadronic blazar emission model. By coupling a Fokker–Planck-based lepto-hadronic particle evolution code, 3DHad, with a polarization-dependent radiation ...
Gamma-gamma absorption in the broad line region radiation fields of gamma-ray blazars
(IOP Publishing, 2016)
The expected level of γγ absorption in the Broad Line Region (BLR) radiation field of γ-ray loud Flat Spectrum Radio Quasars (FSRQs) is evaluated as a function of the location of the γ-ray emission region. This is done ...
Robopol: optical polarisation monitoring of blazars
(HEASA, 2016)
The RoboPol program has been monitoring the R-band linear polarisation parameters of an unbiased
sample of 60 gamma-ray-loud blazars and a “control” sample of 15 gamma-ray-quite ones.
The prime drive for the program has ...
Observations of the flaring Fermi-LAT blazars and prospects in spectro-polarimetry with SALT-RSS
(HEASA, 2016)
The Fermi Gamma-Ray Space telescope has identified 1741 active galactic nuclei during its first four years of observation (2008-2012) and detected 1145 blazars and 573 blazar candidates of uncertain type (BCUs) as listed ...
Gamma-gamma absorption in gamma-ray burst environments
(HEASA, 2016)
Gamma-ray bursts (GRBs) are the most violent explosions in the universe, seen primarily as
bright, short flashes of g-rays. Long GRBs are most likely associated with the violent death
of a very massive star. They are ...
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 ...
A hard gamma-ray flare from 3C 279 in 2013 December
(IOP, 2016)
The blazar 3C 279 exhibited twin γ-ray flares of similar intensity in 2013 December and 2014 April. In this work, we present a detailed multi-wavelength analysis of the 2013 December flaring event. Multi-frequency observations ...
Polarization signatures of relativistic magnetohydrodynamic shocks in the blazar emission region. I. Force-free helical magnetic fields
(IOP, 2016)
The optical radiation and polarization signatures in blazars are known to be highly variable during flaring activities. It is frequently argued that shocks are the main driver of the flaring events. However, the spectral ...
Gravitational light-bending prevents γγ absorption in gravitational lenses
(EDP Sciences, 2016)
The magnification effect that is due to gravitational lensing enhances the chances of detecting moderate-redshift (z ~ 1) sources in very high-energy (VHE; E > 100 GeV) γ-rays by ground-based atmospheric Cherenkov telescope ...