Search results for " Active galaxies"

showing 3 items of 3 documents

A Search for Ultra-high-energy Neutrinos from TXS 0506+056 Using the Pierre Auger Observatory

2020

Results of a search for ultra-high-energy neutrinos with the Pierre Auger Observatory from the direction of the blazar TXS 0506+056 are presented. They were obtained as part of the follow-up that stemmed from the detection of high-energy neutrinos and gamma rays with IceCube, Fermi-LAT, MAGIC, and other detectors of electromagnetic radiation in several bands. The Pierre Auger Observatory is sensitive to neutrinos in the energy range from 100 PeV to 100 EeV and in the zenith-angle range from θ = 60° to θ = 95°, where the zenith angle is measured from the vertical direction. No neutrinos from the direction of TXS 0506+056 have been found. The results were analyzed in three periods: One of 6 m…

010504 meteorology & atmospheric sciencesAstronomyAstrophysicspower spectrum7. Clean energy01 natural sciencesIceCubeObservatoryMAGIC (telescope)UHE Cosmic Rays010303 astronomy & astrophysicsHigh energy astrophysics Neutrino astrony Blazars Transient sources Active galaxiesHigh Energy Astrophysical Phenomena (astro-ph.HE)Physicsastro-ph.HEOBSERVATÓRIOSAstrophysics::Instrumentation and Methods for Astrophysicsneutrino: UHEUHE [neutrino]AugerobservatoryHigh energy astrophysics; Neutrino astronomy; Blazars; Transient sources; Active galaxiesNeutrino detectorNeutrino astronomyNeutrinoAstrophysics - High Energy Astrophysical PhenomenaHigh energy astrophysicsradiation: electromagneticHigh-energy astronomyAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesGLASTblazar0103 physical sciencesNeutrinoHigh Energy PhysicsZenithAstrophysique0105 earth and related environmental sciencesPierre Auger ObservatoryFísicaAstronomy and AstrophysicsAstronomiesensitivityMAGICTransient sourcesSciences de l'espaceelectromagnetic [radiation]13. Climate actionSpace and Planetary Sciencegamma rayExperimental High Energy PhysicsActive galaxiesddc:520spectralNeutrino astronomy[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]Blazars
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Relativistic MHD simulations of extragalactic jets

2005

We have performed a comprehensive parameter study of the morphology and dynamics of axisymmetric, magnetized, relativistic jets by means of numerical simulations. The simulations have been performed with an upgraded version of the GENESIS code which is based on a second-order accurate finite volume method involving an approximate Riemann solver suitable for relativistic ideal magnetohydrodynamic flows, and a method of lines. Starting from pure hydrodynamic models we consider the effect of a magnetic field of increasing strength (up to β ≡ |b|2/2p ≈ 3.3 times the equipartition value) and different topology (purely toroidal or poloidal). We computed several series of models investigating the …

MHDAstrophysicsUNESCO::ASTRONOMÍA Y ASTROFÍSICANose coneRelativitysymbols.namesakeMagnetohydrodynamicsAstrophysical jetJetsAdiabatic processEquipartition theoremMagnetohydrodynamics ; MHD ; numerical method ; Relativity ; Active galaxies ; JetsPhysicsnumerical methodAstronomy and Astrophysics:ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia [UNESCO]Magnetic fieldComputational physicsLorentz factorClassical mechanicsSpace and Planetary SciencePoynting vectorsymbolsActive galaxiesMagnetohydrodynamicsUNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia:ASTRONOMÍA Y ASTROFÍSICA [UNESCO]
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The role of Kelvin-Helmholtz instability in the internal structure of relativistic outflows. The case of the jet in 3C 273

2006

Relativistic outflows represent one of the best-suited tools to probe the physics of AGN. Numerical modelling of internal structure of the relativistic outflows on parsec scales provides important clues about the conditions and dynamics of the material in the immediate vicinity of the central black holes in AGN. We investigate possible causes of the structural patterns and regularities observed in the parsec-scale jet of the well-known quasar 3C 273. We present here the results from a 3D relativistic hydrodynamics numerical simulation based on the parameters given for the jet by Lobanov & Zensus (2001), and one in which the effects of jet precession and the injection of discrete compone…

Astrophysics::High Energy Astrophysical PhenomenaPerturbation (astronomy)FOS: Physical sciencesAstrophysicsUNESCO::ASTRONOMÍA Y ASTROFÍSICAAstrophysics01 natural sciencesJets0103 physical sciencesVery-long-baseline interferometry010306 general physicsQuasars010303 astronomy & astrophysicsPhysicsSuperluminal motionQuasars ; 3C 273 ; Active galaxies ; Galaxies ; Jets ; HydrodynamicsComputer simulationAstrophysics (astro-ph)Mode (statistics)Astronomy and AstrophysicsQuasarGalaxiesViewing angle:ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia [UNESCO]Wavelength13. Climate actionSpace and Planetary ScienceActive galaxiesHydrodynamics3C 273UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia:ASTRONOMÍA Y ASTROFÍSICA [UNESCO]
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