Results 1 to 10 of about 6,255 (211)

Polarized blazar X-rays imply particle acceleration in shocks. [PDF]

open access: yesNature, 2022
Liodakis I   +127 more
europepmc   +1 more source

Hunting Very High-energy-emitting (>100 GeV) High-synchrotron-peaked Blazars

open access: yesThe Astrophysical Journal Supplement Series
Very high-energy (VHE; >100 GeV) γ -ray emission originates via some of the most extreme particle acceleration processes in the Universe. Considering beamed active galactic nuclei, i.e., blazars, only a small fraction, mainly high-synchrotron-peaked BL ...
Sushmita Agarwal, Vaidehi S. Paliya
doaj   +1 more source

Extreme Blazars Observed with MAGIC: Second Catalog Release

open access: yesThe Astrophysical Journal
Extremely high-peaked BL Lac objects—also named extreme blazars —are among the most energetic and persistent extragalactic accelerators in the Universe, defined by a synchrotron emission peaking above 10 ^17 Hz in X-rays.
K. Abe   +356 more
doaj   +1 more source

PKS J0805-0111: A Second Owens Valley Radio Observatory Blazar Showing Highly Significant Sinusoidal Radio Variability—The Tip of the Iceberg

open access: yesThe Astrophysical Journal
Owens Valley Radio Observatory observations of the supermassive black hole binary (SMBHB) candidate PKS 2131−021 revealed, for the first time, six likely characteristics of the phenomenology exhibited by SMBHBs in blazars, of which the most unexpected ...
P. V. de la Parra   +25 more
doaj   +1 more source

Modeling Blazar Broadband Emission with a Convolutional Neural Network. I. Synchrotron Self-Compton Model

open access: yesThe Astrophysical Journal
Modeling the multiwavelength spectral energy distributions (SEDs) of blazars provides key insights into the underlying physical processes responsible for the emission.
D. Bégué   +7 more
doaj   +1 more source

From Equipartition to Curvature: The Spectral Evolution of 4FGL Blazars

open access: yesThe Astrophysical Journal Supplement Series
We investigate the evolution of spectral energy distribution (SED) and underlying electron energy distribution (EED) by modeling the nearly simultaneous broadband spectra of selected bright 4FGL blazars, in the context of a combined cooling and ...
Muhammad S. Anjum   +4 more
doaj   +1 more source

Optical Quasi-Periodic Oscillation of Blazar PKS 1440-389 in the TESS Light Curve

open access: yesUniverse
We report the results of time series analysis of blazar PKS 1440-389, observed by the Transiting Exoplanet Survey Satellite (TESS) in two sectors. We find that the source has a quasi-periodic oscillation (QPO) of about 3.1 days for sector 11 and around 3.
He Lu   +9 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

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