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We have recently found fundamental differences in the radio properties of redquasars when compared to typical blue quasars. In this paper we use X-shooterdata, providing spectral coverage from $\sim 3000-25000$ Ang, of a sample of 40red and blue luminous quasars at $1.45<z<1.65$ to explore the connectionsbetween the radio, emission-line, and accretion-disc properties. We fit variousdust-extinction curves to the data and find that dust reddening can fullyexplain the observed colours for the majority of the red quasars in our sample,with moderate extinctions ranging from Av$\sim 0.06-0.7$ mags. We confront ourspectra with a simple thin accretion-disc model and find this can describe thecontinua of both the blue and red quasars, once corrected for dust extinction;we also find no significant differences in the accretion properties. We detectionized outflows in a number of red and blue quasars, but do not find anysignificant evidence that they are more prevalent in the red quasar population.Overall our findings imply that the radio emission is more closely connected tocircumnuclear/ISM opacity rather than accretion disc or outflow differences.

Fundamental differences in the properties of red and blue quasars: measuring the reddening and accretion properties with X-shooter