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X-ray Emission of ICRF Sources

Tugay, A. V.; Shevchenko, S. Yu.; Voitsekhovskiy, V. V. +1 more

Considering increasing requirements to the coordinates measurement precision by the end of XX century International Astronomical Union commenced implementation of the new astrometric system ICRF (International Celestial Reference Frame). This quasi-inertial reference frame system centered in the barycenter of the Solar System and has axes defined …