Results 131 to 140 of about 20,672 (255)

Detection of Periodic Radio Signal from the Blazar J1043+2408

Galaxies, 2018
The search for periodic signals from blazars has become a widely discussed topic in recent years. In the scenario that such periodic changes originate from the innermost regions of blazars, the signals bear imprints of the processes occurring near the ...
Gopal Bhatta
doaj   +1 more source

The gamma-ray Doppler factor determinations for a Fermi blazar sample [PDF]

, 2013
J. H. Fan, J. H. Yang, Yi Liu, Jingyi Zhang   +3 more
openalex   +1 more source

Millimeter-VLBI Detection and Imaging of the Gravitationally Lensed Gamma-Ray Blazar JVAS B0218+357 [PDF]

, 2020
Kazuhiro Hada, Kotaro Niinuma, J. Sitarek, Cristiana Spingola, Ayumi Hirano   +4 more
openalex   +1 more source

Blazar Compton Efficiencies

Journal of Physics: Conference Series, 2012
The Fermi gamma-ray space telescope has dramatically increased the number of gamma-ray blazars known and means that for the first time, a large sample of blazars selected by the strength of their inverse Compton emission exists. We have cross-identified the blazars listed in the first Fermi-LAT catalog (1FGL) with the CRATES radio catalogue.
J A Gupta, I W A Browne, M W Peel
openaire   +1 more source

Optical Photometric Monitoring of the Blazar OT 355 and Local Standard Stars’ Calibration

Universe
OT 355 (4FGL J1734.3 + 3858) is a relatively rarely studied but highly variable, moderate-redshift (z = 0.975) flat-spectrum radio quasar (blazar). With this work, we aim to study its optical variability on different timescales, which can help us to ...
R. Bachev, Tushar Tripathi, Alok C. Gupta, A. Kurtenkov, Y. Nikolov, A. Strigachev, S. Boeva, G. Latev, B. Spassov, M. Minev, E. Ovcharov, W.-X. Yang, Yi Liu, J.-H. Fan   +13 more
doaj   +1 more source

First Results on Long-Term Multiwavelength Variability Analysis in Mrk 421

EPJ Web of Conferences, 2013
Due to the broad-band nature of the emission from blazars, strong efforts are being placed in recent years on simultaneous multiwavelength campaigns as a way to understand the mechanisms responsible for the acceleration of ultra-relativistic particles in
Racero Elena, de la Calle Ignacio
doaj   +1 more source

Cosmic Clues from Amaterasu: Blazar-driven Ultrahigh-energy Cosmic Rays?

The Astrophysical Journal Letters
The detection of the Amaterasu event of energy 244 EeV by the Telescope Array, one of the most energetic ultrahigh-energy cosmic rays (UHECRs; E  ≳ 0.1 EeV) observed to date, invites scrutiny of its potential source.
Saikat Das, Srijita Hazra, Nayantara Gupta   +2 more
doaj   +1 more source

CHARACTERISTICS OF GAMMA-RAY LOUD BLAZARS IN THE VLBA IMAGING AND POLARIMETRY SURVEY [PDF]

, 2010
Justin D. Linford, G. B. Taylor, Roger W. Romani, S. E. Healey, J. F. Helmboldt, A. C. S. Readhead, R. Reeves, J. L. Richards, Garret Cotter   +8 more
openalex   +1 more source

Blazars as Probes for Fundamental Physics

Universe
Blazars are a class of active galactic nuclei characterized by having one of their relativistic jets oriented close to our line of sight. Their broad emission spectrum makes them exceptional laboratories for probing fundamental physics.
Giorgio Galanti
doaj   +1 more source

Temporal and Spectral Variabilities of High‐Energy Emission from Blazars Using Synchrotron Self‐Compton Models [PDF]

, 2000
Hui Li, Masaaki Kusunose
openalex   +1 more source