Search results for "Astrometria"

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Absolute kinematics of radio-source components in the complete S5 polar cap sample: IV. Proper motions of the radio cores over a decade and spectral …

2016

We have carried out a high-precision astrometric analysis of two very-long-baseline-interferometry (VLBI) epochs of observation of the 13 extragalactic radio sources in the complete S5 polar cap sample. The VLBI epochs span a time baseline of ten years and enable us to achieve precisions in the proper motions of the source cores up to a few micro-arcseconds per year. The observations were performed at 14.4 GHz and 43.1 GHz, and enable us to estimate the frequency core-shifts in a subset of sources, for which the spectral-index distributions can be computed. We study the source-position stability by analysing the changes in the relative positions of fiducial source points (the jet cores) ove…

AstrofísicaActive galactic nucleusAstrometriaAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsKinematics01 natural sciencesStability (probability)Radio continuum: generalBinary black hole0103 physical sciencesVery-long-baseline interferometry010306 general physicsInstrumentation and Methods for Astrophysics (astro-ph.IM)010303 astronomy & astrophysicsAstrophysics::Galaxy AstrophysicsPhysicsJet (fluid)general [Radio continuum]general [BL Lacertae objects]Astrophysics::Instrumentation and Methods for AstrophysicsAstronomy and Astrophysicsgeneral [Quasars]BL Lacertae objects: generalAstrometryAstrometryAstrophysics - Astrophysics of GalaxiesQuasars: generalGravitational lensSpace and Planetary ScienceAstrophysics of Galaxies (astro-ph.GA)Techniques: interferometricinterferometric [Techniques]Astrophysics - Instrumentation and Methods for Astrophysics
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