Unknown selection effect simulates redshift periodicity in quasar number counts from Sloan Digital Sky Survey |
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| Authors: | J G Hartnett |
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| Institution: | (1) INAF – Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, Italy;(2) SISSA/ISAS, Via Beirut 2–4, 34014 Trieste, Italy;(3) Department of Physics and Astronomy, Open University, Walton Hall, Milton Keynes, MK7 6AA, UK;(4) Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada |
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| Abstract: | Discrete Fourier analysis on the quasar number count, as a function of redshift, z, calculated from the Sloan Digital Sky Survey DR6 release appears to indicate that quasars have preferred periodic redshifts
with redshift intervals of 0.258, 0.312, 0.44, 0.63, and 1.1. However the same periods are found in the mean of the zConf parameter used to flag the reliability of the spectroscopic measurements. It follows that these redshift periods must result
from some selection effect, as yet undetermined. It does not signal any intrinsic (quantized) redshifts in the quasars in
Sloan survey data. However this result does not rule out the possibility as found in earlier studies of other data. |
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