Results 141 to 150 of about 33,870 (293)
Variability of Blazars and Blazar Models over 38 Years [PDF]
Galaxies, 2016 Since 1978, when BL Lac objects and violently variable quasars were married to become “blazars”, physical interpretations of the phenomenon have evolved. Remarkably, though, the general picture of relativistic jets beaming their radiation in our direction, proposed that year by Blandford and Rees, remains intact.
openaire +3 more sources
Fermi-LAT Stacking Analysis Technique: An Application to Extreme Blazars and Prospects for their CTA Detection [PDF]
Astrophysical Journal, 2019 We present a likelihood profile stacking technique based on the Fermi-Large Area Telescope (LAT) data to explore the γ-ray characteristics of Fermi-LAT undetected astrophysical populations.
V. Paliya +4 more
semanticscholar +1 more source
, 2011 We examine the constraints on the luminosity-dependent density evolution model for the evolution of blazars given the observed spectrum of the diffuse gamma-ray background (DGRB), blazar source-count distribution, and the blazar spectral energy ...
D. J. Thompson +7 more
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Asca Observations of Blazars [PDF]
Highlights of Astronomy, 1998 During the last years it has become evident that blazar class of AGN emit a lot of energy in the gamma-ray regime. It is generally thought that the non-thermal emission from blazars, observed from radio to GeV/TeV 7-rays, is radiation of very energetic particles via both synchrotron and Compton processes.
Greg Madejski +2 more
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Cascading Constraints from Neutrino-emitting Blazars: The Case of TXS 0506+056 [PDF]
Astrophysical Journal, 2018 We present a procedure to generally constrain the environments of neutrino-producing sites in photomeson production models of jetted active galactic nuclei (AGNs) where any origin of the dominant target photon field can be accommodated.
A. Reimer, M. Boettcher, S. Buson
semanticscholar +1 more source
The extension of variability properties in gamma-ray bursts to blazars
, 2015 Both gamma-ray bursts (GRBs) and blazars have relativistic jets pointing at a small angle from our line of sight. Several recent studies suggested that these two kinds of sources may share similar jet physics.
Cao, Xinwu +5 more
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Polarization swings in blazars [PDF]
Monthly Notices of the Royal Astronomical Society, 2017 11 pages, 18 figures, 2 tables; accepted for publication by ...
E. V. Kravchenko, Maxim Lyutikov
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Gamma-ray quasi-periodicities of blazars. A cautious approach [PDF]
Monthly notices of the Royal Astronomical Society, 2018 The availability of about a decade of uninterrupted sky monitoring by the Fermi satellite has made possible to study long-term quasi-periodicities for high-energy sources.
S. Covino, A. Sandrinelli, Aldo Treves
semanticscholar +1 more source
Implications on the blazar sequence and inverse Compton models from Fermi bright blazars
, 2011 In this paper, we use the quasi-simultaneous spectra of Fermi bright blazars and Fermi detected narrow line Seyfert 1 (NLS1) to study the blazar sequence and inverse Compton (IC) models. I.
Abdo +32 more
core +1 more source
A blazar in the epoch of reionization
Nature AstronomyAbstract Relativistic jets are thought to play a crucial role in the formation and evolution of massive galaxies and supermassive black holes. Blazars, which are quasars with jets aligned along our line of sight, provide insights into the jetted population and have been observed up to redshifts of z = 6.1.
Eduardo Bañados +23 more
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