Search
Now showing items 1-10 of 69
The violent hard X-ray variability of Mrk 421 observed by NuSTAR in 2013 April
(American Astronomical Society, 2015)
The well-studied blazar Markarian 421 (Mrk 421, z = 0.031) was the subject of an intensive multi-wavelength campaign when it flared in 2013 April. The recorded X-ray and very high-energy (E > 100 GeV) γ-ray fluxes are the ...
Magnetic field generation and particle energization at relativistic shear boundaries in collisionless electron-positron plasmas
(IOP Science, 2013)
Using particle-in-cell simulations, we study the kinetic physics of relativistic shear flow in collisionless electron–positron (e+e−) plasmas. We find efficient magnetic field generation and particle energization at the ...
Particle diffusion and localized acceleration in inhomogeneous AGN jets. I. Steady-state spectra
(Oxford University Press, 2015)
We study the acceleration, transport, and emission of particles in relativistic jets. Localized stochastic particle acceleration, spatial diffusion, and synchrotron as well as synchrotron self-Compton (SSC) emission are ...
Probing cluster environments of blazars through γγ absorption
(EDP Sciences, 2015)
Most blazars are known to be hosted in giant elliptic galaxies, but their cluster environments have not been thoroughly investigated. Cluster environments may contain radiation fields of low-energy photons created by nearby ...
Re-awakening of GRS 1716-249 after 23 yr, observed by Swift/XRT and NuSTAR
(Oxford Univ Press, 2019)
In this work, we present a spectral and temporal analysis of Swift/XRT and NuSTAR
observations of GRS 1716–249 during its recent 2016–2017 outburst. This low-mass X-ray
binary underwent an extraordinary outburst after a ...
Hadronic models of blazars require a change of the accretion paradigm
(Oxford University Press, 2015)
We study hadronic models of broad-band emission of jets in radio-loud active galactic nuclei, and their implications for the accretion in those sources. We show that the models that account for broad-band spectra of blazars ...
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 ...
Synchrotron polarization in blazars
(IOP Publishing, 2014)
We present a detailed analysis of time- and energy-dependent synchrotron polarization signatures in a shock-in-jet model for γ-ray blazars. Our calculations employ a full three-dimensional radiation transfer code, assuming ...
Constraining relativistic bow shock properties in rotation-powered millisecond pulsar binaries
(AAS, 2017)
Multiwavelength follow-up of unidentified Fermi sources has vastly expanded the number of known galactic-field "black widow" and "redback" millisecond pulsar binaries. Focusing on their rotation-powered state, we interpret ...
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 ...