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

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[1] The celestial reference frame stability and apparent motions of the radio sources / V. E. Zharov, M. V. Sazhin, V. N. Sementsov et al. // IAU Symposium. — Vol. 261 of IAU Symposium. — 2010. — P. 50–55. 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. [ DOI ]

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