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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 properties

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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 properties

dc.contributor.author	Martí Vidal, Iván
dc.contributor.author	Abellán, F. J.
dc.contributor.author	Marcaide Osoro, Juan María
dc.contributor.author	Guirado Puerta, Jose Carlos
dc.contributor.author	Pérez Torres, Miguel Ángel
dc.contributor.author	Ros Ibarra, Eduardo
dc.date.accessioned	2017-07-18T12:28:56Z
dc.date.available	2017-11-23T05:45:05Z
dc.date.issued	2016
dc.identifier.citation	Martí Vidal, Iván Abellán, F. J. Marcaide Osoro, Juan María Guirado Puerta, Jose Carlos Pérez Torres, Miguel Ángel Ros Ibarra, Eduardo 2016 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 properties Astronomy and Astrophysics 596 A27 1 12
dc.identifier.uri	http://hdl.handle.net/10550/59641
dc.description.abstract	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 10 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) over a decade. We find motions of 0.1-0.9 mas among close-by sources between the two epochs, which imply drifts in the jet cores of approximately a few tens of micro-as per year. These results have implications for the standard Active Galactic Nucleus (AGN) jet model (where the core locations are supposed to be stable in time). For one of our sources, 0615+820, the morphological and spectral properties in year 2010, as well as the relative astrometry between years 2000 and 2010, suggest the possibility of either a strong parsec-scale interaction of the AGN jet with the ISM, a gravitational lens with ~1 mas diameter, or a resolved massive binary black hole.
dc.language.iso	eng
dc.relation.ispartof	Astronomy and Astrophysics, 2016, vol. 596, num. A27, p. 1-12
dc.subject	Astrometria
dc.subject	Astrofísica
dc.title	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 properties
dc.type	journal article	es_ES
dc.date.updated	2017-07-18T12:28:56Z
dc.identifier.doi	10.1051/0004-6361/201628149
dc.identifier.idgrec	114395
dc.rights.accessRights	open access	es_ES