A comparison of cosmological models with high-redshift quasars

Abstract

The non-linear relationship between the monochromatic X-ray and UV luminosities in quasars offers the possibility of using high-z quasars as standard candles for cosmological testing. In this paper, we use a high-quality catalog of 1598 quasars extending to redshift 6, to compare the flat and uniformly expanding cosmological model, $R_h$ = ct and $\Lambda$CDM cosmological models which are the most debated. The quasar samples are mainly from the XMM-Newton and the Sloan Digital Sky Survey (SDSS). The final result is that the Akaike Information Criterion favors $\Lambda$CDM over $R_h$=ct with a relative probability of 86.30% versus 13.70%.Comment: 10 pages, 5 figures, Accepted for publication in APS