Browsing by Subject "Blazars"
Now showing items 1-10 of 11
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A comprehensive power spectral density analysis of astronomical time series. I. The Fermi-LAT gamma-ray light curves of selected blazars
(IOP Publishing, 2020)We present the results of the Fermi-Large Area Telescope 10 yr long light curve (LC) modeling of selected blazars: six flat-spectrum radio quasars (FSRQs) and five BL Lacertae (BL Lacs), examined in 7, 10, and 14 day ... -
The fourth catalog of active galactic nuclei detected by the Fermi large area telescope
(IOP, 2020)The fourth catalog of active galactic nuclei (AGNs) detected by the Fermi Gamma-ray Space Telescope Large Area Telescope (4LAC) between 2008 August 4 and 2016 August 2 contains $2863$ objects located at high Galactic ... -
Impact of ordered and disordered magnetic fields on multiwavelength emission of blazars
(IOP Publishing, 2020)We present a detailed analysis of the effects of magnetic field topology on the spectral energy distribution (SED) and spectral variability patterns (SVPs) of blazars. In order to study these effects, we have extended our ... -
Modelling the spectral energy distribution and polarisation of blazars
(North-West University (South Africa), 2019)The optical emission from most blazars is dominated by the polarised synchrotron radiation of relativistic electrons in the jet. However, the thermal radiation from the accretion disc and host galaxy also contributes towards ... -
Monte Carlo Simulations of Compton Polarization in Astrophysical Sources
(North-West University (South Africa)North-West University, 2020)The description of many high-energy astrophysical sources relies on the production of relativistic jets that are accompanied by the acceleration of particles up to very high energies, and the production of non-thermal ... -
Multi-wavelength variability signatures of relativistic shocks in blazar jets
(IOP Publishing, 2019)Mildly relativistic shocks that are embedded in colliding magnetohydrodynamic flows are prime sites for relativistic particle acceleration and the production of strongly variable, polarized multi-wavelength emission from ... -
New hard-TeV extreme blazars detected with the MAGIC telescopes
(IOP, 2020)Extreme high-frequency-peaked BL Lac objects (EHBLs) are blazars that exhibit extremely energetic synchrotron emission. They also feature nonthermal gamma-ray emission whose peak lies in the very high-energy (VHE, E > 100 ... -
On the detection potential of blazar flares for current neutrino telescopes
(IOP Publishers, 2020)Blazar jets are extreme environments, in which relativistic proton interactions with an ultraviolet photon field could give rise to photopion production. High-confidence associations of individual high-energy neutrinos ... -
Optical observations reveal strong evidence for high-energy neutrino progenitor
(IOP Publishing, 2020)We present the earliest astronomical observation of a high-energy neutrino error box of which the variability was discovered after high-energy-neutrino detection. The one robotic telescope of the MASTER global international ... -
Progress in multi-wavelength and multi-messenger observations of blazars and theoretical challenges
(MDPI, 2019)This review provides an overview of recent advances in multi-wavelength and multi-messenger observations of blazars, the current status of theoretical models for blazar emission, and prospects for future facilities. The ...