Results 1 to 10 of about 34,122 (236)
Gaussian Processes for Blazar Variability Studies
Galaxies, 2017 This article briefly introduces Gaussian processes as a new approach for modelling time series in the field of blazar physics. In the second part of the paper, recent results from an application of GP modelling to the multi-wavelength light curves of the
Vassilis Karamanavis
doaj +4 more sources
Assigning Degrees of Stochasticity to Blazar Light Curves in the Radio Band Using Complex Networks
Entropy, 2022 We focus on characterizing the high-energy emission mechanisms of blazars by analyzing the variability in the radio band of the light curves of more than a thousand sources.
Belén Acosta-Tripailao +3 more
doaj +1 more source
Universe, 2023 In this work, we study the parameter space of neutrino-emitting BL Lacs under the framework of the one-zone lepto-hadronic model. We show that constraints on the model come from various aspects of observations such as the variability timescale of blazar ...
Zhi-Peng Ma, Kai Wang
doaj +1 more source
Jetted Narrow-Line Seyfert 1 Galaxies & Co.: Where Do We Stand?
Universe, 2020 The discovery in 2008 of high-energy gamma-rays from Narrow-Line Seyfert 1 Galaxies (NLS1s) made it clear that there were active galactic nuclei (AGN) other than blazars and radio galaxies that can eject powerful relativistic jets.
Luigi Foschini
doaj +1 more source
Polarimetric Properties of Blazars Caught by the WEBT
Galaxies, 2021 Active galactic nuclei come in many varieties. A minority of them are radio-loud, and exhibit two opposite prominent plasma jets extending from the proximity of the supermassive black hole up to megaparsec distances.
Claudia M. Raiteri, Massimo Villata
doaj +1 more source
The Astrophysical Journal, 2023 Among the ∼2157 unassociated sources in the third data release (DR3) of the fourth Fermi catalog, ∼1200 were observed with the Neil Gehrels Swift Observatory pointed instruments.
Amanpreet Kaur +2 more
doaj +1 more source
The Effect of Blazar Spectral Breaks on the Blazar Contribution to the Extragalactic Gamma-ray Background [PDF]
, 2011 The spectral shapes of the contributions of different classes of unresolved gamma-ray emitters can provide insight into their relative contributions to the extragalactic gamma-ray background (EGB) and the natures of their spectra at GeV energies.
Abazajian +36 more
core +3 more sources
Multifrequency Study of the Blazar 3C 454.3
Galaxies, 2016 This work is devoted to multi-frequency studying of the blazar 3C 454.3. The study includes spectroscopic and photometric observations in the optical, IR, and gamma-ray bands.
Ilhuiyolitzin Villicaña-Pedraza +3 more
doaj +1 more source
Using gravitational lensed images to investigate the intrinsic AGN variability [PDF]
, 2016 We discuss about how the relative flux densities among the images of gravitationally-lensed active galactic nuclei, AGN, can be used to study the intrinsic AGN variability with high accuracy.
Marti-Vidal, I., Muller, S.
core +2 more sources
Polarimetric Monitoring of Jets with Kanata Telescope
Galaxies, 2018 The polarization of relativistic jets is of interest for the understanding of their origin, confinement, and propagation. However, even though numerous measurements have been performed, the mechanisms behind jet variability, creation, and composition are
Ryosuke Itoh +3 more
doaj +1 more source