Critical Examinations of QSO Redshift Periodicities and Associations with Galaxies in Sloan Digital Sky Survey Data (2005) Su Min Tang, Shuang Nan Zhang
Just reading through the paper above, the authors write (page 8):
"After smoothing off the sharp edges in the lowest and highest redshifts, a periodicity around Δz= 0.67 is detected in the full sample of SDSS QSOs, as shown in Fig. 9; however a periodicity of Δz= 0.67 ± 0.05 or any other frequency is not found in the 2dF QSOs, as shown in Fig. 10."
But conclude the section by writing:
"In sum, there is no evidence for intrinsic periodicity in redshifts of QSOs."
Can anyone help explain why the sum is
no periodicity, even though they found a periodicity?
I think M.B. Bell, and D. McDiarmid explain it in their paper, "
Six Peaks Visible in the Redshift Distribution of 46,400 SDSS Quasars Agree with the Preferred Redshifts Predicted by the Decreasing Intrinsic Redshift Model" (2006), but I don't understand it.
Regards,
Ian Tresman