Results 21 to 30 of about 16,751 (259)
Searches for Neutrinos in the Direction of Radio-bright Blazars with the ANTARES Telescope [PDF]
Astrophysical 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]
Astrophysical 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]
Monthly 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]
Astrophysical 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]
, 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
Characterizing Long-term Optical Variability Properties of γ-Ray-bright Blazars [PDF]
Astrophysical Journal, 2021 Optical observations of a sample of 12 γ-ray-bright blazars from four optical data archives—American Association of Variable Star Observers, Small and Moderate Aperture Research Telescope System, Catalina, and Steward Observatory—are compiled to create ...
G. Bhatta
semanticscholar +1 more source
Characterizing the Emission Region Properties of Blazars
Astrophysical Journal Supplement Series, 2023 Studies and constraints on the emission region are crucial to the blazar radiation mechanism. Yet previous works have mainly focused on individual sources.
Junhui Fan +6 more
semanticscholar +1 more source
Frequency and Time Dependence of Linear Polarization in Turbulent Jets of Blazars [PDF]
Galaxies, 2021 Time-variable polarization is an extremely valuable observational tool to probe the dynamical physical conditions of blazar jets. Since 2008, we have been monitoring the flux and linear polarization of a sample of gamma-ray bright blazars at optical ...
A. Marscher, S. Jorstad
semanticscholar +1 more source
The Astrophysical Journal, 2023 Recent works have developed samples of blazars from among the Fermi Large Area Telescope unassociated sources via machine-learning comparisons with known blazar samples. Continued analysis of these new blazars tests the predictions of the blazar sequence
Stephen Kerby, Abraham D. Falcone
doaj +1 more source
Classification of unassociated fermi-LAT sources [PDF]
ITM Web of Conferences, 2022 The Large Area Telescope (LAT) on board NASA’s Fermi Gamma-ray Space telescope has detected 5788 sources in the 4FGL catalogue. Among them, 271 have been associated to pulsars, 3436 to blazars, and 1782 remain unassociated sources.
Meng Qiyu
doaj +1 more source