Study of high Eddington accretion with the ultrafast outflow of NGC 1313 ULX-1

We propose a high-resolution spectral and timing study of the emissionand absorption lines from the ultraluminous X-ray source (ULX) NGC 1313X-1. With a 750 ks XMM-Newton observation (split into three epochs), wewill quantify the geometry and physical properties of the relativisticwind and its relation with the accretion rate and radiative luminosity,solving a fundamental problem of black hole accretion. We will determine:a) the launching radius of the wind; b) the mass outflow rate andkinetic power; c) the ionisation structure of the emitting plasma; d)the optical thickness of the wind as a function of spectral hardness ofthe X-ray continuum (a proxy for the viewing angle), which will describethe presence of orbital and super-orbital periods and the accretionpower of ULXs.