Reeves, J.J.ReevesBRAITO, ValentinaValentinaBRAITONARDINI, EMANUELEEMANUELENARDINIMatzeu, G.G.MatzeuLobban, A.A.LobbanCosta, M.M.CostaPounds, K.K.PoundsTombesi, FrancescoFrancescoTombesiBehar, E.E.Behar2020-07-272020-07-272017http://hdl.handle.net/20.500.12386/26645The recent large XMM-Newton programmes on the nearby quasars PDS 456 and PG 1211+143 have revealed prototype ultra fast outflows in the iron K band through highly blue shifted absorption lines. The wind velocities are in excess of 0.1c and are likely to make a significant contribution to the host galaxy feedback. Here we present evidence for the signature of the fast wind in the soft X-ray band from these luminous quasars, focusing on the spectroscopy with the RGS. In PDS 456, the RGS spectra reveal the presence of soft X-ray broad absorption line profiles, which suggests that PDS 456 is an X-ray equivalent to the BAL quasars, with outflow velocities reaching 0.2c. In PG 1211, the soft X-ray RGS spectra show a complex of several highly blue shifted absorption lines over a wide range of ionisation and reveal outflowing components with velocities between 0.06-0.17c. For both quasars, the soft X-ray absorption is highly variable, even on timescales of days and is most prominent when the quasar flux is low. Overall the results imply the presence of a soft X-ray component of the ultra fast outflows, which we attribute to a clumpy or inhomogeneous phase of the disk wind.ELETTRONICOenConference paperhttps://www.cosmos.esa.int/documents/332006/1402684/JReeves_t.pdfhttps://www.cosmos.esa.int/web/xmm-newton/2017-symposium2017xru..conf..188RFIS/05 - ASTRONOMIA E ASTROFISICA