0000000000769355

AUTHOR

Kirill Sokolovsky

showing 4 related works from this author

Multiband variability studies and novel broadband SED modeling of Mrk 501 in 2009

2017

Astronomy and astrophysics 603, A31 (2017). doi:10.1051/0004-6361/201629540

extragalactic background lightmultiwavelength observationsAstrophysics::High Energy Astrophysical Phenomenabl-lacertae objectsGalaxies: BL Lacertae objects: individual: Markarian 501 ; Methods: data analysis ; observational ; Polarizationspectral energy-distributionFluxFOS: Physical sciencesAstrophysics01 natural scienceslaw.inventionindividual: Markarian 501 [BL Lacertae objects]lawCoincident0103 physical sciencesddc:530MAGIC (telescope)crab-nebulaBlazardata analysis [Methods]010303 astronomy & astrophysicsPhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)tev blazars010308 nuclear & particles physicsstochastic accelerationtelescope observationsInstitut für Physik und AstronomieAstronomy and AstrophysicsAstronomy and Astrophysicgamma-ray emissionmethods: data analysis520BL Lacertae objects: individual: Markarian 501; Methods: data analysisSynchrotrondata analysi [Methods]BL Lacertae objects: individual: Markarian 501; Methods: data analysis; Astronomy and Astrophysics; Space and Planetary ScienceBL Lacertae objects: individual: Markarian 501x-raySpace and Planetary Scienceddc:520ElectrónicaFísica nuclearElectricidadDegeneracy (mathematics)Astrophysics - High Energy Astrophysical PhenomenaFlareBL Lac object
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VLBI-selected sample of Compact Symmetric Object candidates and frequency-dependent position of hotspots

2011

The Compact Symmetric Objects (CSOs) are small (<1 kiloparsec) and powerful extragalactic radio sources showing emission on both sides of an active galactic nucleus and no signs of strong relativistic beaming. They may be young radio sources, progenitors of large FRII radio galaxies. We aim to study the statistical properties of CSOs by constructing and investigating a new large sample of CSO candidates on the basis of dual-frequency, parsec-scale morphology. For the candidate selection we utilized VLBI data for 4170 extragalactic objects obtained simultaneously at 2.3 and 8.6 GHz (S and X band) within the VLBA Calibrator Survey 1-6 and the Research and Development - VLBA projects. Prope…

PhysicsSpectral indexActive galactic nucleusCosmology and Nongalactic Astrophysics (astro-ph.CO)010504 meteorology & atmospheric sciencesRadio galaxyX bandFOS: Physical sciencesAstronomy and AstrophysicsAstrophysics01 natural sciencesSpectral lineRelativistic beamingSpace and Planetary ScienceBrightness temperature0103 physical sciencesVery-long-baseline interferometry010303 astronomy & astrophysics0105 earth and related environmental sciencesAstrophysics - Cosmology and Nongalactic Astrophysics
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RadioAstron reveals a spine-sheath jet structure in 3C 273

2021

We present Space-VLBI RadioAstron observations at 1.6 GHz and 4.8 GHz of the flat spectrum radio quasar 3C 273, with detections on baselines up to 4.5 and 3.3 Earth Diameters, respectively. Achieving the best angular resolution at 1.6 GHz to date, we have imaged limb-brightening in the jet, not previously detected in this source. In contrast, at 4.8 GHz, we detected emission from a central stream of plasma, with a spatial distribution complementary to the limb-brightened emission, indicating an origin in the spine of the jet. While a stratification across the jet width in the flow density, internal energy, magnetic field, or bulk flow velocity are usually invoked to explain the limb-brighte…

Astrophysics::High Energy Astrophysical PhenomenaStratification (water)FOS: Physical sciencesJets [Galaxies]AstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciencesQuasars: individual: 3C 2730103 physical sciencesAngular resolution010303 astronomy & astrophysicsAstrophysics::Galaxy AstrophysicsPhysicsJet (fluid)Internal energy010308 nuclear & particles physicsAstronomy and AstrophysicsQuasarPlasmaGalaxies: activeAstrophysics - Astrophysics of GalaxiesActive [Galaxies]Magnetic fieldFlow velocitySpace and Planetary ScienceGalaxies: jetsAstrophysics of Galaxies (astro-ph.GA)Astrophysics::Earth and Planetary AstrophysicsIndividual: 3C 273 [Quasars]
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Probing the innermost regions of AGN jets and their magnetic fields with RadioAstron II. Observations of 3C 273 at minimum activity

2017

RadioAstron is a 10 m orbiting radio telescope mounted on the Spektr-R satellite, launched in 2011, performing Space Very Long Baseline Interferometry (SVLBI) observations supported by a global ground array of radio telescopes. With an apogee of about 350 000 km, it is offering for the first time the possibility to perform {\mu}as-resolution imaging in the cm-band. We present observations at 22 GHz of 3C 273, performed in 2014, designed to reach a maximum baseline of approximately nine Earth diameters. Reaching an angular resolution of 0.3 mas, we study a particularly low-activity state of the source, and estimate the nuclear region brightness temperature, comparing with the extreme one det…

PhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)BrightnessActive galactic nucleus010504 meteorology & atmospheric sciencesAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstronomy and AstrophysicsContext (language use)AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics - Astrophysics of Galaxies01 natural sciencesRadio telescopeSpace and Planetary ScienceBrightness temperatureAstrophysics of Galaxies (astro-ph.GA)0103 physical sciencesVery-long-baseline interferometryAstrophysics - High Energy Astrophysical PhenomenaBlazar010303 astronomy & astrophysicsAstrophysics::Galaxy Astrophysics0105 earth and related environmental sciencesFermi Gamma-ray Space Telescope
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