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We presented CAIXA, a Catalogue of AGN in the XMM-Newton Archive, in acompanion paper. Here, a systematic search for correlations between the X-rayspectral properties and the multiwavelength data was performed for the sourcesin CAIXA. All the significant (>99.9% confidence level) correlations arediscussed along with their physical implications on current models of AGN. Twomain correlations are discussed in this paper: a) a very stronganti-correlation between the FWHM of the H$\beta$ optical line and the ratiobetween the soft and the hard X-ray luminosity. Although similaranti-correlations between optical line width and X-ray spectral steepness havealready been discussed in the literature (see e.g., Laor et al. 1994, Boller etal. 1996, Brandt et al. 1997), we consider the formulation we present in thispaper is more fundamental, as it links model-independent quantities. Coupledwith a strong anti-correlation between the V to hard X-ray flux ratio and theH$\beta$ FHWM, it supports scenarios for the origin of the soft excess in AGN,which require strong suppression of the hard X-ray emission; b) a strong (andexpected) correlation between the X-ray luminosity and the black hole mass. Itsslope, flatter than 1, is consistent with Eddington ratio-dependent bolometriccorrections, such as that recently proposed by Vasudevan & Fabian (2009).Moreover, we critically review through various statistical tests the role thatdistance biases play in the strong radio to X-ray luminosity correlation foundin CAIXA and elsewhere; we conclude that only complete, unbiased samples (suchas that recently published by Behar & Laor, 2008) should be used to drawobservational constraints on the origin of radio emission in radio-quiet AGN.

CAIXA: a Catalogue of AGN In the XMM-Newton Archive II. Multiwavelength correlations