Tracing Quasar Accretion Rates at Higher Redshifts

In this work we connect some measurable properties of the CIV1549 emission line with the quasar accretion rates (Eddington ratios). A tight correlation is found for a sample of more than a hundred nearby objects, suggesting a possible method for a relatively accurate estimate of the Eddington ratio of high-redshift quasars, at least for the radio-quiet ones. This paper further confirms the existing notion that the CIV changes (shifts) are mostly driven by the accretion rate.