Contribution of stable sources to ICRF improvements

Details Contribution of stable sources to ICRF improvements Contribution of stable sources to ICRF improvements

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..602g&link_type=abstract

In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J

Astronomy and Astrophysics

Astronomy

International Celestial Reference System

Scientific paper

A set of stable compact radio sources is proposed for the future maintenance of the ICRF axes using VLBI-derived time series of coordinates of extragalactic radio sources. The proposed selection scheme makes a combined use of statistical and deterministic tests. It identifies 199 stable sources to be compared to the current 212 defining sources. Their consideration for the maintenance of the frame axes is expected to improve the frame stability by a factor of five reaching the level of less than 10 microarcseconds in the medium term. The time behaviour of the radio source directions and their type of noise will be presented.

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