https://ui.adsabs.harvard.edu/abs/1971ApJ...164L.113G
https://ui.adsabs.harvard.edu/abs/1971ApJ...164L.113G
UI.ADSABS.HARVARD.EDU
On the Distances of the Quasi-Stellar Objects
It is shown that Ton 256 (z = 0.131) and PKS 2251+11 (z = 0.323) are associated with galaxies of essentially the same redshift, thus implying that these objects are at cosmological distances. The nature of Ton 256 is questionable, and it is argued that it represents a transition between Seyfert galaxies and QSOs. There is no doubt that PKS 2251+11 is a bona fide QSO; it is bright (M = -24.7), blue (B - V = 0.20, U - B = -0.84), has a starlike image under high resolution, and is a strong radio source. A peculiar emission structure near PKS 2251+11 is also discussed.
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