Radio source structure and VLBI position instabilities
Langue
en
Communication dans un congrès
Ce document a été publié dans
2013, Montpellier. 2013-11p. 161-164
Résumé en anglais
Astrometric positions of extragalactic radio sources derived from VLBI data are used to build highly-accurate reference frames such as the International Celestial Reference Frame. Despite their distant locations, instabilities ...Lire la suite >
Astrometric positions of extragalactic radio sources derived from VLBI data are used to build highly-accurate reference frames such as the International Celestial Reference Frame. Despite their distant locations, instabilities in the position of these sources are often seen on time scales of months to years, which is generally thought to be caused by source structure evolution. In this paper, we compare position instabilities and structural evolution for a sample of 68 sources observed over a 10-year period (1994--2003). Our results indicate that the two phenomena are linked at some level although the correlation is not perfect.< Réduire
Mots clés en anglais
VLBI
astrometry
active galactic nuclei
quasars
Reference systems
Origine
Importé de halUnités de recherche