Title：X-ray Spectral and Optical Properties of Ultra Luminous X-ray Sources in Nearby Galaxies

　　Speaker：Prof. Aysun Akyuz (Department of Physics, University of Cukurova, Adana, Turkey)

　　Abstract：Ultraluminous X-ray sources (ULXs) are variable, nonnuclear X-ray sources with isotropic luminosities (Lx > 1039 erg s-1) above the Eddington limit for a 10 (M_sun ) black hole. In this presentation, I will review the main properties of ULXs and their popular spectral models. As part of our work, spectral and temporal characteristics of some ULXs are presented. Also the properties of the optical counterparts and constraints on their physical nature from multiband optical spectra are discussed.

　　Time：Dec. 3rd (Thursday), 10:30am

　　Place：Room 212, Astronomy Building

欢迎各位老师、同学参加！

　　                                         南京大学天文与空间科学学院