Data: 31.03.2026

Grzegorz Wiktorowicz (CAMK,PL)

Ultraluminous X-ray sources across stellar environments

Streszczenie:
Ultraluminous X-ray sources (ULXs) are extragalactic point-like sources with apparent luminosities exceeding 10³⁹ erg s⁻¹, representing some of the most extreme accretion systems in the Universe. Once attributed to intermediate-mass black holes, now most ULXs are understood to harbour stellar-mass compact objects (black holes or neutron stars) undergoing super-Eddington accretion. Yet many fundamental questions remain open: the NS-to-BH ratio across different environments, the role of geometric beaming, the contribution of wind-fed accretion, and how dense dynamical environments shape ULX demographics. I will present the recent developments in this field.