Colliding Winds in Ultraluminous X-ray Sources

LEANDRO ABAROA

Congreso; Reunión Anual de la Asociación Argentina de Astronomía; 2021

Ultraluminous X-ray sources (ULX) are objects with luminosities that exceed the Eddington limit for a stellar-mass black hole. In these closed binary systems, the star overflows its Roche lobe and the black hole accretes matter at a supercritical rate. The upper layers of the disk are no longer in equilibrium and are ejected as a powerful radiation-driven wind that interacts with the wind from the star producing shocks where particles can be accelerated up to relativistic energies and then cool down yielding a broadband spectrum.