4.6 Article

Beamed Emission from a Neutron-star ULX in a GRRMHD Simulation

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Pulsating ULXs: large pulsed fraction excludes strong beaming

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Summary: The discovery of pulsating ultraluminous X-ray sources (ULXs) indicates that the apparent luminosity of accreting neutron stars can exceed the Eddington luminosity by a factor of 100s. The relationship between actual and apparent luminosity in ULXs is still debated. A large pulsed fraction is a typical feature of discovered pulsating ULXs. Using Monte Carlo simulations, it is argued that strong beaming and high pulsed fraction largely exclude each other in ULXs. This suggests that pulsating ULXs are not strongly beamed and their apparent luminosity is close to the actual one.

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