Results 61 to 70 of about 16,751 (259)
Directional Association of TeV to PeV Astrophysical Neutrinos with Radio Blazars
, 2020 Recently we have shown that high-energy neutrinos above 200 TeV detected by IceCube are produced within several parsecs in the central regions of radio-bright blazars, that is active galactic nuclei with jets pointing toward us.
A. Plavin +3 more
semanticscholar +1 more source
Gaussian Process Modeling Fermi-LAT γ-Ray Blazar Variability: A Sample of Blazars with γ-Ray Quasi-periodicities [PDF]
, 2020 Blazar variability may be driven by stochastic processes. On the other hand, quasi-periodic oscillation (QPO) behaviors were recently reported to be detected in the Fermi-LAT data of blazars.
Shenbang Yang +4 more
semanticscholar +1 more source
The Nature of Micro-Variability in Blazars
Galaxies, 2021 We present the results of a long-term study designed to investigate the nature of micro-variability in blazars carried out primarily at the Southeastern Association for Research in Astronomy (SARA) observatories.
James R. Webb +8 more
doaj +1 more source
Multiwavelength study of high-redshift blazars [PDF]
Monthly notices of the Royal Astronomical Society, 2020 High-redshift blazars are among the most powerful objects in the Universe. The spectral and temporal properties of 33 distant blazars (z > 2.5) detected in the high-energy γ-ray band are investigated by analysing the Fermi-LAT and Swift Ultraviolet and
N. Sahakyan +4 more
semanticscholar +1 more source
Universe, 2022 Blazars are observed to emit non-thermal radiation across the entire electromagnetic spectrum from the radio to the very-high-energy γ-ray region. The broadband radiation measured from a blazar is dominated by emission from a relativistic plasma jet ...
Krishna Kumar Singh +4 more
doaj +1 more source
The Nature of γ-Ray Variability in Blazars [PDF]
Astrophysical Journal, 2019 We present an in-depth and systematic variability study of a sample of 20 powerful blazars, including 12 BL Lacs and 8 flat-spectrum radio quasars, applying various analysis tools such as flux distribution, symmetry analysis, and time-series analysis on ...
G. Bhatta, N. Dhital
semanticscholar +1 more source
The 3HSP catalogue of extreme and high-synchrotron peaked blazars [PDF]
Astronomy & Astrophysics, 2019 Aims. High-synchrotron peaked blazars (HSPs or HBLs) play a central role in very high-energy (VHE) γ-ray astronomy, and likely in neutrino astronomy. Currently, the largest compilation of HSP blazars, the 2WHSP sample, includes 1691 sources, but it is ...
Yu-Ling Chang +4 more
semanticscholar +1 more source
The CLASS blazar survey: testing the blazar sequence [PDF]
Monthly Notices of the Royal Astronomical Society, 2004 We discuss the properties of the sources in the CLASS Blazar survey which aims at the selection of low radio power (P(5GHz)<10^25 W Hz^-1) blazars. We use VLA data from available catalogues and from our own observations to constrain the radio core-dominance of the sample which, together with the flat radio spectral index, is a signature of the ...
Caccianiga, A., Marchã, M. J. M.
openaire +3 more sources
Optical spectroscopy of blazars for the Cherenkov Telescope Array [PDF]
Astronomy & Astrophysics, 2020 Context. Blazars are the most numerous class of High Energy (HE; E about 50 MeV - few 100 GeV) and Very High Energy (VHE; E about 100 GeV - 10 TeV) gamma-ray emitters.
P. Goldoni +16 more
semanticscholar +1 more source
Multifrequency observations of Blazars [PDF]
, 1987 This paper reports the results of a programme of multifrequency observations of a sample of Blazars concentrating particularly on the millimetre through infrared region.
E. I. Robson +5 more
core +1 more source