085259

We propose to probe the disc-corona system and determine the BH spin of the bright bare AGN Mrk 110. Our 2 in a spectral analysis method is based on the global energetics of the disc-corona system and accounts for the contribution of relativistic reflection and the coronal extension. It has been successfully tested on the moderate accretion rate bright bare AGN comma Ark120 comma where for the first time we tightly constrained its BH spin comma and revealed that the corona radius decreases with increasing flux.