Matzeu, GA, Reeves, JN, Braito, V, Nardini, E, McLaughlin, DE, , Tombesi, F and Costa, MT (2017) Evidence for a radiatively driven disc-wind in PDS 456? Monthly Notices of the Royal Astronomical Society: Letters, 472 (1). L15-L19.

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1708.03546v2.pdf - Accepted Version

We present a newly discovered correlation between the wind outflow velocity and the X-ray luminosity in the luminous ($L_{\rm bol}\sim10^{47}\,\rm erg\,s^{-1}$) nearby ($z=0.184$) quasar PDS\,456. All the contemporary XMM-Newton, NuSTAR and Suzaku observations from 2001--2014 were revisited and we find that the centroid energy of the blueshifted Fe\,K absorption profile increases with luminosity. This translates into a correlation between the wind outflow velocity and the hard X-ray luminosity (between 7--30\,keV) where we find that $v_{\rm w}/c \propto L_{7-30}^{\gamma}$ where $\gamma=0.22\pm0.04$. We also show that this is consistent with a wind that is predominately radiatively driven, possibly resulting from the high Eddington ratio of PDS\,456.