Results 171 to 180 of about 16,751 (259)

A Search for Millimeter-bright Blazars as Astrophysical Neutrino Sources

open access: yesThe Astrophysical Journal
The powerful jets of blazars have been historically considered as likely sites of high-energy cosmic-ray acceleration. However, the particulars of the launched jet and the locations of leptonic and hadronic jet loading remain unclear.
R. Abbasi   +428 more
doaj   +1 more source

Spin Tetrad Formalism of Circular Polarization States in Relativistic Jets

open access: yesUniverse
Relativistic jets from active galactic nuclei (AGN) have been a topic of peak interest in the high-energy astrophysics community for their uniquely dynamic nature and incredible radiative power emanating from supermassive black holes and similarly ...
Ronald Gamble
doaj   +1 more source

Evolving parsec-scale radio structure in the most distant blazar known. [PDF]

open access: yesNat Commun, 2020
An T   +9 more
europepmc   +1 more source

Synergies of THESEUS with the large facilities of the 2030s and guest observer opportunities. [PDF]

open access: yesExp Astron (Dordr), 2021
Rosati P   +39 more
europepmc   +1 more source

Simultaneous multifrequency observations of blazars [PDF]

open access: yes, 1997
Among active galactic nuclei, blazars have the most highly and rapidly variable spectral continua at all the wavelengths. Their repeated observation at different energies allows therefore to investigate the geometry and the physics of the emitting ...
Pian, E.
core  

Universal Stochastic Process in Blazar Gamma-Ray Variability Revealed by Bayesian Kernel Comparison

open access: yesThe Astrophysical Journal
Although Gaussian processes have been widely applied in modeling the high-energy light curves of blazars, a systematic comparison of the performances of different kernel functions within Gaussian processes has remained lacking.
Jiachao Liu   +6 more
doaj   +1 more source

Neutrino Detection Rates from Lepto-hadronic Model Simulations of Bright Blazar Flares

open access: yesThe Astrophysical Journal
There is mounting evidence that blazars are the sources of part of the very-high-energy astrophysical neutrino flux detected by IceCube. In particular, there have been several spatial and temporal coincidences of individual IceCube neutrino events with ...
Joshua Robinson, Markus Böttcher
doaj   +1 more source

Multiwavelength analysis of the variability of the blazar 3C 273. [PDF]

open access: yesMon Not R Astron Soc, 2020
Fernandes S   +4 more
europepmc   +1 more source

Gaia Sees Blazars Move: Locating Optical Flares Using Astrometry

open access: yesThe Astrophysical Journal Letters
When blazars flare, their optical position moves. We show this by combining Gaia DR3 proper motions with epoch photometry for blazars with strong optical jet emission.
A. V. Plavin
doaj   +1 more source

VLBI Analysis of a Potential High-Energy Neutrino Emitter Blazar

open access: yesUniverse
Recent studies suggest that high-energy neutrinos can be produced in the jets of blazars, radio-loud active galactic nuclei (AGN) with jets pointing close to the line of sight.
Janka Kőmíves   +3 more
doaj   +1 more source

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