REACHING THE LIMIT: THE FAST WIND IN THE NLS1 comma PG 1448+273.

PG1448+273 is a luminous Narrow Line Seyfert 1 galaxy, thought to be accretingat the Eddington limit. An XMMNewton observation in 2017 captured an ultra fastoutflow in PG1448+273, via a deep Fe absorption trough between 78 keV, with anoutflow velocity of 0.1c. The AGN has never been observed at hard Xrays. Wepropose a simultaneous NuSTAR (120 ks) and XMMNewton (75 ks) observation toquantify the physical properties of the fast wind. The observations will; (i)provide a realistic estimate of the mass outflow rate and wind energetics, (ii)probe variations in the wind in response to the continuum and (iii) measure thebroadband SED and quantify the mass accretion rate and Eddington ratio. Theobservations will test the plausibility of radiation driven winds near the Eddington limit. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]