0000000000136338

AUTHOR

Dmitry Khangulyan

showing 6 related works from this author

Coupling hydrodynamics and radiation calculations for star-jet interactions in AGN

2016

Stars and their winds can contribute to the non-thermal (NT) emission in extragalactic jets. Given the complexity of jet-star interactions, the properties of the resulting emission are strongly linked to those of the emitting flows. We simulate the interaction between a stellar wind and a relativistic extragalactic jet and use the hydrodynamic results to compute the NT emission under different conditions. We perform relativistic axisymmetric hydrodynamical simulations of a relativistic jet interacting with a supersonic, non-relativistic stellar wind. We compute the corresponding streamlines out of the simulation results, and calculate the injection, evolution, and emission of NT particles a…

High Energy Astrophysical Phenomena (astro-ph.HE)Astrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstrophysics::Solar and Stellar AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics - High Energy Astrophysical PhenomenaAstrophysics::Galaxy Astrophysics
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Coupling hydrodynamics and radiation calculations for star-jet interactions in active galactic nuclei

2016

Context. Stars and their winds can contribute to the non-thermal emission in extragalactic jets. Because of the complexity of jet-star interactions, the properties of the resulting emission are closely linked to those of the emitting flows. Aims. We simulate the interaction between a stellar wind and a relativistic extragalactic jet and use the hydrodynamic results to compute the non-thermal emission under different conditions. Methods. We performed relativistic axisymmetric hydrodynamical simulations of a relativistic jet interacting with a supersonic, non-relativistic stellar wind. We computed the corresponding streamlines out of the simulation results and calculated the injection, evolut…

Active galactic nucleusElectromagnetic spectrumAstrophysics::High Energy Astrophysical PhenomenaAstrophysics::Cosmology and Extragalactic AstrophysicsElectronAstrophysicsRadiation7. Clean energy01 natural sciencessymbols.namesake0103 physical sciencesAstrophysics::Solar and Stellar Astrophysics010303 astronomy & astrophysicsAstrophysics::Galaxy AstrophysicsPhysicsHidrodinàmica010308 nuclear & particles physicsAstronomy and AstrophysicsStarsEstelsMagnetic fieldParticle accelerationStars13. Climate actionSpace and Planetary ScienceHydrodynamicssymbolsDoppler effectAstronomy & Astrophysics
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Non-thermal radiation from a pulsar wind interacting with an inhomogeneous stellar wind

2017

Binaries hosting a massive star and a non-accreting pulsar are powerful non-thermal emitters due to the interaction of the pulsar and the stellar wind. The winds of massive stars are thought to be inhomogeneous, which could have an impact on the non-thermal emission. We study numerically the impact of the presence of inhomogeneities or clumps in the stellar wind on the high-energy non-thermal radiation of high-mass binaries hosting a non-accreting pulsar. We compute the trajectories and physical properties of the streamlines in the shocked pulsar wind without clumps, with a small clump, and with a large one. This information is used to compute the synchrotron and inverse Compton emission fr…

Be starAstrophysics::High Energy Astrophysical PhenomenaPopulationEstels binarisFOS: Physical sciencesSynchrotron radiationAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics7. Clean energy01 natural sciencesRaigs gammaDouble starsPulsar0103 physical sciencesAstrophysics::Solar and Stellar AstrophysicsAdiabatic processeducation010303 astronomy & astrophysicsPulsarsSolar and Stellar Astrophysics (astro-ph.SR)Astrophysics::Galaxy AstrophysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)Physicseducation.field_of_studyHidrodinàmica010308 nuclear & particles physicsGamma raysAstronomy and AstrophysicsPúlsarsParticle accelerationStarsAstrophysics - Solar and Stellar Astrophysics13. Climate actionSpace and Planetary ScienceThermal radiationHydrodynamicsAstrophysics - High Energy Astrophysical PhenomenaAstronomy & Astrophysics
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Broadband Multi-wavelength Properties of M87 during the 2017 Event Horizon Telescope Campaign

2021

Full list of authors: EHT MWL Science Working Group; Algaba, J. C.; Anczarski, J.; Asada, K.; Baloković, M.; Chandra, S.; Cui, Y. -Z.; Falcone, A. D.; Giroletti, M.; Goddi, C.; Hada, K.; Haggard, D.; Jorstad, S.; Kaur, A.; Kawashima, T.; Keating, G.; Kim, J. -Y.; Kino, M.; Komossa, S.; Kravchenko, E. V.; Krichbaum, T. P.; Lee, S. -S.; Lu, R. -S.; Lucchini, M.; Markoff, S.; Neilsen, J.; Nowak, M. A.; Park, J.; Principe, G.; Ramakrishnan, V.; Reynolds, M. T.; Sasada, M.; Savchenko, S. S.; Williamson, K. E.; Event Horizon Telescope Collaboration; Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Anantua, Richard; Azulay, Rebecca; Baczko, Anne-Kathrin; Ball, David; Barrett, John; Bintley, Dan; …

Accretion010504 meteorology & atmospheric sciencesAstronomyFluxAstrophysics7. Clean energy01 natural sciencesActive galactic nuclei; Radio cores; Low-luminosity active galactic nuclei; High energy astrophysics; Astrophysical black holes; Accretion; Astrophysics - High Energy Astrophysical Phenomena; Astrophysics - Cosmology and Nongalactic Astrophysics; Astrophysics - Astrophysics of Galaxies010303 astronomy & astrophysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)Physicsastro-ph.HERadio coreAccretion (meteorology)PhysicsAstrophysical black holes520 Astronomie und zugeordnete WissenschaftenActive galactic nuclei ; Radio cores ; Low-luminosity ; active galactic nuclei ; High energy astrophysics ; Astrophysical black holes ; AccretionAstrophysical black holeLow-luminosity active galactic nucleiastro-ph.COAstrophysics - High Energy Astrophysical PhenomenaAccretion; Active galactic nuclei; Astrophysical black holes; High energy astrophysics; Low-luminosity active galactic nuclei; Radio coresHigh energy astrophysicsRadio coresAstrophysics - Cosmology and Nongalactic AstrophysicsCosmology and Nongalactic Astrophysics (astro-ph.CO)Active galactic nucleusHigh-energy astronomyastro-ph.GAAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesF500Astrophysics::Cosmology and Extragalactic AstrophysicsHigh energy astrophysic0103 physical sciencesVery-long-baseline interferometryddc:530Astrophysics::Galaxy Astrophysics0105 earth and related environmental sciencesEvent Horizon TelescopeSupermassive black holeActive galactic nucleiAstronomy and Astrophysics530 PhysikAstrophysics - Astrophysics of GalaxiesGalaxySpace and Planetary ScienceAstrophysics of Galaxies (astro-ph.GA)ddc:520Active galactic nuclei; Radio cores; Low-luminosity active galactic nuclei; High energy astrophysics; Astrophysical black holes; AccretionHESS - Abteilung Hinton[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
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3D simulations of wind-jet interaction in massive X-ray binaries

2010

High-mass microquasars may produce jets that will strongly interact with surrounding stellar winds on binary system spatial scales. We study the dynamics of the collision between a mildly relativistic hydrodynamical jet of supersonic nature and the wind of an OB star. We performed numerical 3D simulations of jets that cross the stellar wind with the code Ratpenat. The jet head generates a strong shock in the wind, and strong recollimation shocks occur due to the initial overpressure of the jet with its environment. These shocks can accelerate particles up to TeV energies and produce gamma-rays. The recollimation shock also strengthens jet asymmetric Kelvin-Helmholtz instabilities produced i…

X-rays : binaries; ISM: jets and outflows; Stars : winds outflows; Radiation mechanisms: non-thermalAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesContext (language use)Astrophysics:ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia::Fuentes de Rayos X [UNESCO]UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia::Fuentes de Rayos Xwinds outflows [Stars]Supersonic speedAstrophysics::Galaxy AstrophysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)PhysicsJet (fluid)non-thermal [Radiation mechanisms]Shock (fluid dynamics)OB starjets and outflows [ISM]Astronomy and AstrophysicsAstrophysics - Astrophysics of GalaxiesOverpressureParticle accelerationDiscontinuity (linguistics)Space and Planetary ScienceAstrophysics of Galaxies (astro-ph.GA)binaries [X-rays]High Energy Physics::ExperimentUNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia::EstrellasAstrophysics - High Energy Astrophysical Phenomena:ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia::Estrellas [UNESCO]Astronomy and Astrophysics
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Simulations of stellar/pulsar wind interaction along one full orbit

2012

The winds from a non-accreting pulsar and a massive star in a binary system collide forming a bow-shaped shock structure. The Coriolis force induced by orbital motion deflects the shocked flows, strongly affecting their dynamics. We study the evolution of the shocked stellar and pulsar winds on scales in which the orbital motion is important. Potential sites of non-thermal activity are investigated. Relativistic hydrodynamical simulations in two dimensions, performed with the code PLUTO and using the adaptive mesh refinement technique, are used to model interacting stellar and pulsar winds on scales ~80 times the distance between the stars. The hydrodynamical results suggest the suitable lo…

Astrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstrophysics01 natural sciencessymbols.namesakePulsar0103 physical sciencesAstrophysics::Solar and Stellar Astrophysics010303 astronomy & astrophysicsAstrophysics::Galaxy AstrophysicsPhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)010308 nuclear & particles physicsAdaptive mesh refinementTurbulenceAstronomy and AstrophysicsParticle accelerationPlutoStarsLorentz factor13. Climate actionSpace and Planetary ScienceOrbital motionsymbolsAstrophysics::Earth and Planetary AstrophysicsAstrophysics - High Energy Astrophysical Phenomena
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