Speaker: Maria Dolores Caballero-García (Osservatorio Astronomico di Brera, INAF-OAB)
Abstract: Ultra-luminous X-ray sources are accreting black holes that might
represent strong evidence of the Inter-Mediate Mass Black Holes (IMBH),
proposed to exist by theoretical studies but with no firm detection (as a class) so far.
In this talk I will present achievements that have been done in that
direction and our new timing versus spectral results. I will discuss them in the
framework of disc theory and provide some clues into the mass of these