084486

The growth of early supermassive black holes requires high accretion rate releasing huge amount of radiation and winds slowing down both accretion rates and start formation. This programme focuses on the physics of high-mass accretion on the stellar mass level where super-Eddington luminosities are more commonly observed. We propose deep X-ray observations of the corner stone supersoft Ultra-Luminous X-ray source openParULXclosePar NGC 247 X-1 to probe the very soft end of the hardness distribution necessary to complete the current view. This is the only source that continuously switches between supersoft and classical ultraluminous states comma providing a unique workbench for our study. With a 1 Ms XMM-Newton program comma we will detect ultrafast outflows and understand how super-Eddington accretion works.