Quasi-periodic dipping in the ultraluminous X-ray source, NGC 247 ULX-1
Quasi-periodic dipping in the ultraluminous X-ray source, NGC 247 ULX-1
ABSTRACT Most ultraluminous X-ray sources (ULXs) are believed to be stellar mass black holes or neutron stars accreting beyond the Eddington limit. Determining the nature of the compact object and the accretion mode from broad-band spectroscopy is currently a challenge, but the observed timing properties provide insight into the compact …