Abstract
Quasi-stellar objects have been discovered with redshifts up to z = 3.53. The object of record redshift was discovered 8 years ago. The only other object with z > 3.5 was discovered (using purely optical techniques) about 8 weeks ago. A critical discussion of the reality of this apparent upper limit to QSO redshifts is given. Because numerous quasars are now known with z > 3, such a limit could imply that quasars first became visible within a rather short time interval.
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Smith, M.G. (1982). Quasars at Large Redshifts. In: Wolfendale, A.W. (eds) Progress in Cosmology. Astrophysics and Space Science Library, vol 99. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7873-7_19
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DOI: https://doi.org/10.1007/978-94-009-7873-7_19
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