Results 21 to 30 of about 2,377,761 (195)
Reinforcement Learning-based Spectrum Sharing for Cognitive Radio [PDF]
, 2011 This thesis investigates how distributed reinforcement learning-based resource assignment algorithms can be used to improve the performance of a cognitive radio system.
Jiang, Tao
core +6 more sources
DISCERNING THE GAMMA-RAY-EMITTING REGION IN THE FLAT SPECTRUM RADIO QUASARS [PDF]
The Astrophysical Journal Supplement Series, 2016 ABSTRACT A model-dependent method is proposed to determine the location of the γ-ray-emitting region for a given flat spectrum radio quasar (FSRQ). In the model, the extra-relativistic electrons are injected at the base of the jet and non-thermal photons are produced by both synchrotron radiation and inverse-Compton (IC) scattering in ...
Y. G. Zheng +3 more
openaire +3 more sources
THE LUMINOSITY FUNCTION OFFERMI-DETECTED FLAT-SPECTRUM RADIO QUASARS [PDF]
The Astrophysical Journal, 2012 Submitted to the Astrophysical ...
Ajello, M. +10 more
openaire +3 more sources
On the evolution of Seyfert galaxies, BL Lacertae objects and flat-spectrum radio quasars [PDF]
Astrophysics and Space Science, 2022 11 Pages, 14 figures, 4 tables.
Iyida, Evaristus U. +2 more
openaire +2 more sources
Flat Spectrum Radio Quasars through the MAGIC glasses [PDF]
Proceedings of The 34th International Cosmic Ray Conference — PoS(ICRC2015), 2016 The detection of Flat Spectrum Radio Quasars (FSRQs) in the Very High Energy (VHE, E > 100 GeV) range is challenging, mainly because of their steep spectra in this energy band. Up to now, only five FSRQs are known to be VHE γ-ray emitters, all of them have been detected by the MAGIC telescopes, that discovered four of them in the VHE band.
Becerra González, J. +15 more
openaire +2 more sources
EeV astrophysical neutrinos from flat spectrum radio quasars [PDF]
Astronomy & Astrophysics, 2020 Context. Flat-spectrum radio quasars (FSRQs) are the most powerful blazars in the γ-ray band. Although they are supposed to be good candidates in producing high-energy neutrinos, no secure detection of FSRQs has been obtained to date, except for a possible case of PKS B1424-418. Aims.
C. Righi +3 more
openaire +2 more sources
Persistence of blazar state in flat-spectrum radio quasars
, 2022 Flat-spectrum radio quasars (FSRQs) whose brightness is dominated by a relativistically beamed core, are frequently found in 'blazar state' commonly inferred from a high optical polarization ( > 3%), and/or a large continuum variability. Here we use these two prime optical markers to investigate continuance of an FSRQ in blazar (or non-blazar) state
Chand, Krishan, Gopal-Krishna
openaire +2 more sources
Redshift distributions of steep and flat-spectrum radio quasars and relativistic beaming [PDF]
Symposium - International Astronomical Union, 1986 Redshift distributions of almost complete samples of steep as well as flat-spectrum radio quasars are investigated. It is found that flat-spectrum (core-dominated) quasars contain a higher fraction of high redshifts (z ≳ 1.4) compared to steep-spectrum ones.
V. K. Kapahi, V. K. Kulkarni
openaire +1 more source
The Long-Lasting Activity in the Flat Spectrum Radio Quasar (FSRQ) CTA 102 [PDF]
Galaxies, 2019 The flat spectrum radio quasar CTA 102 ( z = 1.032 ) went through a tremendous phase of variability. Since early 2016 the gamma-ray flux level has been significantly higher than in previous years. It was topped by a four month long giant outburst, where peak fluxes were more than 100 times higher than the quiescence level.
Michael Zacharias +5 more
openaire +5 more sources
Spectrum sharing and cognitive radio [PDF]
, 2009 Spectrum sharing has been the subject of a 3 year research programme organised by the UK's Virtual Centre of Excellence in Mobile and Personal Communications.
A. Yarmohammad +11 more
core +1 more source