Magnetic Fields of Compact Objects in Close X-Ray Binary Systems

TL;DR

This paper reviews magnetic fields in X-ray binary systems, focusing on neutron stars, white dwarfs, and black holes, and provides estimates of magnetic field strengths near black hole accretion disks.

Contribution

It offers the first real estimates of magnetic field strength at the innermost stable orbit in black hole accretion disks.

Findings

Magnetic fields can exist in accretion disks around black holes.

Neutron stars and white dwarfs have intrinsic magnetic fields.

Black holes lack intrinsic magnetic fields but influence surrounding magnetic environments.

Abstract

X-ray binary systems are very popular objects for astrophysical investigations. Compact objects in these systems are neutron stars, white dwarfs and black holes. Neutron stars and white dwarfs can have intrinsic magnetic fields. There is well known, famous theorem about absence of intrinsic magnetic fields of black holes. But magnetic field can exist in the accretion disk around a black hole. We present here the real estimates of the magnetic field strength at the radius of innermost stable orbit in an accretion disk of stellar mass black holes.