Evidence against non-cosmological redshifts of QSOs in SDSS data

TL;DR

This study analyzes SDSS data to test non-cosmological redshift models for QSOs, finding no evidence of association with active galaxies and confirming that QSO redshifts are cosmological in origin.

Contribution

It provides a comprehensive review and analysis of SDSS data, demonstrating that observed redshift distribution features are due to selection effects, supporting the cosmological redshift hypothesis.

Findings

No strong link between active galaxies and high-redshift QSOs.

Dips at z=2.7 and 3.5 are caused by selection effects.

QSO redshifts are consistent with a cosmological origin.

Abstract

In the unusual intrinsic QSO redshift models, QSOs are ejected by active galaxies with periodic non-cosmological reshifts, thus QSOs are generally associated with active galaxies, and certain structures will be revealed in the QSO redshift distribution. As the largest homogeneous sample of QSOs and galaxies, SDSS data provide the best opportunity to examine this issue. We review the debates on this issue, focused on those based on SDSS and 2dF data, and conclude that there is no strong connection between foreground active galaxies and high-redshift QSOs. The existence of two dips in the SDSS QSO redshift distribution at z=2.7 and 3.5 has recently re-ignited those controversial debates on the origin of QSO redshift. It also turned out that both dips are totally caused by selection effects and after selection effects have been corrected, the two dips disappear and no structure in the redshift distribution of SDSS DR5 sample. These results support that the reshifts of QSOs are cosmological.