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Periodicity versus selection effects in the redshift distribution of QSOs
Author(s) -
Basu D.
Publication year - 2001
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/1521-3994(200110)322:4<229::aid-asna229>3.0.co;2-x
Subject(s) - qsos , redshift , astrophysics , selection (genetic algorithm) , physics , distribution (mathematics) , constant (computer programming) , galaxy , mathematics , mathematical analysis , computer science , artificial intelligence , programming language
Periodicities and selection effects in the redshift ( z ) distribution of QSOs have been debated for a long time in the literature. Here we show that peaks and troughs in the redshift distribution of three new samples, claimed to demonstrate the existence of a periodicity, can be interpreted in terms of known selection effects. This analysis confirms earlier findings that the presence of such selection effects seriously weakens any suggestion for periodicity of the form Δl n (1 + z ) = constant.