Results 121 to 130 of about 34,122 (236)

Emissive Mechanism to Explain Spectral Variability of Blazars in High Frequencies [PDF]

, 2001
Jiancheng Wang, Jirong Mao, Jiancheng Wang, Jirong Mao   +3 more
openalex   +1 more source

X-Ray Studies of Blazar 1ES 1959+650 Using Swift and XMM-Newton Satellite [PDF]

, 2023
Kiran Wani, Haritma Gaur, M. K. Patil
openalex   +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

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

High‐Frequency VLBA Total and Polarized Intensity Images of Gamma‐Ray Bright Blazars [PDF]

, 2002
Alan P. Marscher, S. G. Jorstad, J. R. Mattox, A. E. Wehrle   +3 more
openalex   +1 more source

The Awakening of a Blazar at Redshift 2.7 Temporally Coincident with the Arrival of Cospatial Neutrino Event IceCube-201221A

The Astrophysical Journal Letters
We report on multiwavelength studies of a blazar NVSS J171822+423948, which is identified as the low-energy counterpart of 4FGL J1718.5+4237, the unique γ -ray source known to be cospatial with the IceCube neutrino event IC-201221A.
Xiong Jiang, Neng-Hui Liao, Yi-Bo Wang, Rui Xue, Ning Jiang, Ting-Gui Wang   +5 more
doaj   +1 more source

Hint at an axion-like particle from the redshift dependence of blazar spectra [PDF]

, 2019
Giorgio Galanti, M. Roncadelli, A. De Angelis, G. F. Bignami   +3 more
openalex   +1 more source

Diffuse astrophysical neutrinos from dark matter around blazars

Physics Letters B
Neutrinos from blazars can originate from inelastic scatterings between protons within their jets and sub-GeV dark matter (DM) around them, explaining IceCube detections of neutrinos from TXS 0506+056 that are otherwise challenging for models of its jet.
Andrea Giovanni De Marchi, Alessandro Granelli, Jacopo Nava, Filippo Sala   +3 more
doaj   +1 more source

Frequency-dependent time delays for strong outbursts in selected blazars from the Metsähovi and UMRAO monitoring data bases – II [PDF]

, 2007
T. B. Pyatunina, N. A. Kudryavtseva, D. C. Gabuzda, S. G. Jorstad, M. F. Aller, H. D. Aller, H. Teräsranta   +6 more
openalex   +1 more source

Optical photopolarimetry of blazar OJ287★ [PDF]

, 2014
V. Bozhilov, E. Ovcharov, G. Nikolov
openalex   +1 more source