Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...242....1s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 242, no. 1, Feb. 1991, p. 1-12. Research supported by Carnegie Trust for the U
Astronomy and Astrophysics
Astrophysics
25
Absorption Spectra, Periodic Variations, Quasars, Red Shift, Galaxies, Spectral Line Width, Stellar Spectra
Scientific paper
The history of quasar periodicities is reviewed, to put the Delta-ln(1 + z) of about 0.205 periodicity in its proper context. Selection effects are discussed and it is demonstrated that the emission-line spectra of quasars themselves contain a periodicity on approximately the same scale. The statistical methods employed to give significance values for periodicities are also discussed. In particular the V test is useful for testing an a priori periodic hypothesis. Several different samples of redshifts are analyzed, including new data sets with significantly smaller selection effects. An X-ray selected sample, quasar absorption line samples and objects in the highest and lowest redshift ranges are also examined. The conclusion is that there is no evidence for such a periodic structure.
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