Results 121 to 130 of about 6,418 (210)

Blazars (VLBA & Glast)

open access: yes, 2003
This review paper discusses the past and present observations of gamma-ray blazars with both space and ground-based gamma-ray telescopes (such as EGRET and current TeV telescopes), and with the VLBA. I also discuss the more sensitive gamma-ray telescopes such as AGILE and GLAST that will become available over the next several years, and how ...
openaire   +2 more sources

Swift for blazars

open access: yesJournal of High Energy Astrophysics, 2015
I will review recent advances in the field of blazars, highlighting the contribution of Swift. Together with other operating satellites (most notably Fermi, but also AGILE, WISE, Planck) and ground based facilities such as Cherenkov telescopes, Swift was (and is) crucial for improving our understanding of blazars.
openaire   +3 more sources

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

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

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

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

A unifying theoretical scheme for gamma-ray bright blazars

open access: yes, 1998
The phenomenology of gamma-ray bright blazars can be accounted for by a sequence in the source power and intensity of the diffuse radiation field surrounding the relativistic jet.
Celotti, Anna Lisa   +4 more
core   +1 more source

TeV blazars and their distance

open access: yes, 2010
Recently, a new method to constrain the distance of blazars with unknown redshift using combined observations in the GeV and TeV regimes has been developed, with the underlying assumption that the Very High Energy (VHE) spectrum corrected for the ...
Maraschi, Laura   +4 more
core   +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

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

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