Results 11 to 20 of about 34,519 (239)

The contribution of Fermi-2LAC blazars to the diffuse TeV-PeV neutrino flux [PDF]

open access: yes, 2016
The recent discovery of a diffuse cosmic neutrino flux extending up to PeV energies raises the question of which astrophysical sources generate this signal. One class of extragalactic sources which may produce such high-energy neutrinos are blazars.
Aartsen, M. G.   +322 more
core   +5 more sources

A tool to understand emission mechanisms of blazars through their high‐energy gamma‐ray emission [PDF]

open access: hybridAstronomische Nachrichten, Volume 344, Issue 6, August 2023., 2023
The blazar SED is characterized by two energy components. Evidence suggests that the low‐energy component is generated by the synchrotron mechanism, but for the high‐energy component, the mechanism is still uncertain. Two main models have been proposed to explain this emission. According to the leptonic model, a correlation between the emission of both
Mabel Osorio   +3 more
openalex   +2 more sources

The space density of z>4 blazars [PDF]

open access: yesMonthly notices of the Royal Astronomical Society, 2019
High redshift blazars are an important class of Active Galactic Nuclei (AGN) that can provide an independent estimate of the supermassive black-hole mass function in high redshift radio-loud AGN without the bias due to absorption along the line-of-sight.
Antón, Sonia   +11 more
core   +4 more sources

Leptohadronic multi-messenger modeling of 324 gamma-ray blazars [PDF]

open access: yesAstronomy & Astrophysics, 2023
The origin of the diffuse astrophysical neutrino flux observed by the IceCube experiment is still under debate. Multiple associations have been reported between high-energy neutrino events and individual blazars, such as the source TXS 0506+056, which ...
X. Rodrigues   +5 more
semanticscholar   +1 more source

Correlating High-energy IceCube Neutrinos with 5BZCAT Blazars and RFC Sources [PDF]

open access: yesAstrophysical Journal Letters, 2023
We investigate the possibility that blazars in the Roma-BZCAT Multifrequency Catalogue of Blazars (5BZCAT) are sources of the high-energy astrophysical neutrinos detected by the IceCube Neutrino Observatory, as recently suggested by Buson et al. Although
C. Bellenghi   +3 more
semanticscholar   +1 more source

Searches for Neutrinos in the Direction of Radio-bright Blazars with the ANTARES Telescope [PDF]

open access: yesAstrophysical Journal, 2023
Active galaxies, especially blazars, are among the most promising extragalactic candidates for high-energy neutrino sources. To date, ANTARES searches included these objects and used GeV–TeV γ-ray flux to select blazars.
A. Albert   +161 more
semanticscholar   +1 more source

Kinematics of Parsec-scale Jets of Gamma-Ray Blazars at 43 GHz during 10 yr of the VLBA-BU-BLAZAR Program [PDF]

open access: yesAstrophysical Journal Supplement Series, 2022
We analyze the parsec-scale jet kinematics from 2007 June to 2018 December of a sample of γ-ray bright blazars monitored roughly monthly with the Very Long Baseline Array (VLBA) at 43 GHz under the VLBA-BU-BLAZAR program.
Z. Weaver   +9 more
semanticscholar   +1 more source

Growing evidence for high-energy neutrinos originating in radio blazars [PDF]

open access: yesMonthly notices of the Royal Astronomical Society, 2022
Evidence for bright radio blazars being high-energy neutrino sources was found in recent years. However, specifics of how and where these particles get produced still need to be determined.
A. Plavin   +3 more
semanticscholar   +1 more source

BASS. XXXIII. Swift-BAT Blazars and Their Jets through Cosmic Time [PDF]

open access: yesAstrophysical Journal, 2022
We derive the most up-to-date Swift-Burst Alert Telescope (BAT) blazar luminosity function in the 14–195 keV range, making use of a clean sample of 118 blazars detected in the BAT 105 month survey catalog, with newly obtained redshifts from the BAT ...
L. Marcotulli   +15 more
semanticscholar   +1 more source

The first hard X-ray spectral catalogue of Blazars observed by NuSTAR [PDF]

open access: yes, 2022
Blazars are a peculiar class of active galactic nuclei (AGNs) that enlighten the sky at all wavelengths. The electromagnetic emission of these sources is jet-dominated resulting in a spectral energy distribution (SED) that has a typical double-humped ...
R. Middei   +7 more
semanticscholar   +1 more source

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