Speaker
David Abarca
(Nicolaus Copernicus Astronomical Center)
Description
We perform global 2D axisymmetric general relativistic radiation magnetohydrodynamic simulations of super-critical disk accretion onto a neutron star with a modest dipolar magnetic field strength of 20 GigaGauss as a model of a ULX. We study the effect of the boundary condition on the structure of the accretion column, outflow, and radiative output. In addition to fully absorbing and reflecting boundary conditions, we introduce a parameterized energy-reflecting boundary condition which returns the inflowing energy as radiative flux scaled by an albedo. We measure apparent isotropic luminosities ranging from 150-500 Eddington luminosities resulting from beaming of the radiation field by the accretion column.
Primary author
David Abarca
(Nicolaus Copernicus Astronomical Center)
Co-authors
Dr
Kyle Parfrey
(Princeton University)
Prof.
Włodek Kluźniak
(CAMK)