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The celestial reference frame stability and apparent motions of the radio sources

Published online by Cambridge University Press:  06 January 2010

V. E. Zharov ,
M. V. Sazhin ,
V. N. Sementsov ,
K. V. Kuimov ,
O. S. Sazhina  and
N. T. Ashimbaeva
V. E. Zharov
Affiliation:
Physics Departement of Moscow State University, Universitetsky pr. 13, Moscow, Russia email: VladZh2007@yandex.ru
M. V. Sazhin
Affiliation:
Sternberg State Astronomical Institute of Moscow State University, Universitetsky pr. 13, Moscow, Russia email: valera@sai.msu.ru
V. N. Sementsov
Affiliation:
Sternberg State Astronomical Institute of Moscow State University, Universitetsky pr. 13, Moscow, Russia email: valera@sai.msu.ru
K. V. Kuimov
Affiliation:
Sternberg State Astronomical Institute of Moscow State University, Universitetsky pr. 13, Moscow, Russia email: valera@sai.msu.ru
O. S. Sazhina
Affiliation:
Sternberg State Astronomical Institute of Moscow State University, Universitetsky pr. 13, Moscow, Russia email: valera@sai.msu.ru
N. T. Ashimbaeva
Affiliation:
Sternberg State Astronomical Institute of Moscow State University, Universitetsky pr. 13, Moscow, Russia email: valera@sai.msu.ru
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Abstract

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Time series of the coordinates of the ICRF radio sources were analyzed. It was shown that part of radio sources, including even the so-called “defining” sources, show a the significant apparent motion. Corrections for their a priori coordinates are time functions. The celestial reference frame stability is provided by the no-net-rotation condition applied to the selected subset of sources, which leads in our case to a rotation of the frame axes with time. Parameters of this rotation were calculated for different subsets of sources.

To improve stability of the celestial reference frame new methods of selection of the extragalactic radio sources were suggested. The first one was called “cosmological” and the second one “kinematical”. It was shown that a selected subset of the ICRF sources, according to cosmological criteria, determines the most stable coordinate system during next decade.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S261: Relativity in Fundamental Astronomy: Dynamics, Reference Frames, and Data Analysis , April 2009 , pp. 50 - 55
Copyright
Copyright © International Astronomical Union 2010

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