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Absolute kinematics of radio source components in the complete S5 polar cap sample : II. First and second epoch maps at 15 GHz

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Absolute kinematics of radio source components in the complete S5 polar cap sample : II. First and second epoch maps at 15 GHz

dc.contributor.author	Pérez Torres, Miguel Ángel
dc.contributor.author	Marcaide Osoro, Juan María
dc.contributor.author	Guirado Puerta, Jose Carlos
dc.contributor.author	Ros Ibarra, Eduardo
dc.date.accessioned	2010-06-29T10:39:19Z
dc.date.available	2010-06-29T10:39:19Z
dc.date.issued	2004
dc.identifier.citation	Pérez Torres, Miguel Ángel; Marcaide Osoro, Juan Maria ; Guirado Puerta, Jose Carlos ; Ros, E., 2004, Absolute kinematics of radio source components in the complete S5 polar cap sample : II. First and second epoch maps at 15 GHz, Astronomy and Astrophysics, vol. 428, no. 3, p. 847-866	en
dc.identifier.uri	http://hdl.handle.net/10550/13998
dc.description.abstract	We observed the thirteen extragalactic radio sources of the complete S5 polar cap sample at 15.4 GHz with the Very Long Baseline Array, on 27 July 1999 (1999.57) and 15 June 2000 (2000.46). We present the maps from those two epochs, along with maps obtained from observations of the 2 cm VLBA survey for some of the sources of the sample, making a total of 40 maps. We discuss the apparent morphological changes displayed by the radio sources between the observing epochs. Our VLBA observations correspond to the first two epochs at 15.4 GHz of a program to study the absolute kinematics of the radio source components of the members of the sample, by means of phase delay astrometry at 8.4 GHz, 15.4 GHz, and 43 GHz. Our 15.4 GHz VLBA imaging allowed us to disentangle the inner milliarcsecond structure of some of the sources, thus resolving components that appeared blended at 8.4 GHz. For most of the sources, we identified the brightest feature in each radio source with the core. These identifications are supported by the spectral index estimates for those brightest features, which are in general flat, or even inverted. Most of the sources display core-dominance in the overall emission, as given by the core-toextended ratio in the 15.4 GHz frame, Q.We find that three of the sources have their most inverted spectrum component shifted with respect to the origin in the map, which approximately coincides with the peak-of-brightness at both 15.4 GHz and 8.4 GHz.	en
dc.language.iso	en	en
dc.subject	Astrometry ; Interferometric ; Galaxies ; Quasars ; BL Lacertae objects ; Radio continuum	en
dc.title	Absolute kinematics of radio source components in the complete S5 polar cap sample : II. First and second epoch maps at 15 GHz	en
dc.type	journal article	es_ES
dc.subject.unesco	UNESCO::ASTRONOMÍA Y ASTROFÍSICA	en
dc.subject.unesco	UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia	en
dc.identifier.doi	10.1051/0004-6361:20040423	en
dc.identifier.idgrec	016798	en
dc.type.hasVersion	VoR	es_ES
dc.identifier.url	http://www.aanda.org/articles/aa/pdf/2004/48/aa0423-04.pdf	en