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Session: Cosmology and Relativistic Astrophysics

Name: Dr. Georgios Vasilopoulos (NKUA/IASA)
Coauthors: No coauthors were included.
Type: Oral
Title: From BeXRBs to ULXPs: connecting the “dots”
Abstract:

Spin-evolution in accreting objects is dictated by well known principles and can provide indirect estimates of the magnetic field of the NS. Moreover, the observed flux from a system is a good proxy of the mass accretion rate onto the compact object. However, in ULXPs things become complicated. The accretion disk is no longer Keplerian and the flux can show variations on super-orbital scales that are related to disk precession and can result in beaming effects. Thus to study the spin-up of NS above the Eddington limit we need to take into account these extra effects. In my talk I will introduce evidence from observational campaigns of ULXPs that help us understand the flux-mass accretion coupling in ULXPs that provide input to torque modeling in super-Eddington accretion. An ideal case study are very bright BeXRBs – like SMC X-3, RX J0209.6-7427 and Swift J0243.6+6124 – that can exceed the Eddington limit and can help us explore the complicated parameter space of torque modeling.