Beamed Emission from a Neutron-star ULX in a GRRMHD Simulation
Abstract
We perform a global 2.5D general-relativistic radiation magnetohydrodynamic simulation of supercritical accretion onto a neutron star with a 2 × 1010 G dipolar magnetic field, as a model of a neutron-star-powered ultraluminous X-ray source (ULX). We compute a lower limit on the total luminosity of ~2.5 LEdd, and find the radiation to be highly beamed by the accretion disk outflows. The apparent isotropic luminosity, which is a function of the viewing angle, reaches a maximum above 100 LEdd, consistent with the luminosities observed in ULXs.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- August 2021
- DOI:
- 10.3847/2041-8213/ac1859
- arXiv:
- arXiv:2107.01149
- Bibcode:
- 2021ApJ...917L..31A
- Keywords:
-
- Ultraluminous x-ray sources;
- Magnetohydrodynamical simulations;
- Neutron stars;
- 2164;
- 1966;
- 1108;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 9 pages, 4 figures, Submitted to ApJ Letters