Abstract
VLBI (very-long-baseline interferometry) observations between 1971 and 1983 have been used to determine the positions of the ‘core’ of the quasar 3C345 relative to the more distant compact quasar NRAO512 with a fractional uncertainty as small as 2 parts in 108. The core of 3C345 appears stationary in right ascension to within 20 arc μs yr−1, a subluminal bound corresponding to 0.7c. The apparent velocities of the jets are superluminal, up to 14c in magnitude.
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Bartel, N., Herring, T., Ratner, M. et al. VLBI limits on the proper motion of the ‘core’ of the superluminal quasar 3C345. Nature 319, 733–738 (1986). https://doi.org/10.1038/319733a0
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DOI: https://doi.org/10.1038/319733a0
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