Photoionization of the Composite Nebula Surrounding NGC 5408 X-1: Implications for Beamed Emission

Jing Guo, Hua Feng, Roberto Soria +4

NGC 5408 X-1 is one of the best studied ultraluminous X-ray sources (ULXs) and is surrounded by a photoionized nebula. Previous optical spectroscopy established the presence of str…