Abstract
BECAUSE QSOs are rare1,2 the discovery of close pairs with discordant redshifts is improbable if they are randomly distributed on the plane of the sky. But Stockton3 has reported that Ton155 and Ton156 form a pair of 17 mag QSOs, with a separation of approximately 35 arc s. For QSOs randomly distributed on the plane of the sky he gives the probability for an accidental occurrence of this close pair as 6×10−3.
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References
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WAMPLER, E., BALDWIN, J., BURKE, W. et al. A Double Quasistellar Object. Nature 246, 203–205 (1973). https://doi.org/10.1038/246203a0
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DOI: https://doi.org/10.1038/246203a0
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