Efficiency of magnetized thin accretion disks in the Kerr metric

Research output: Contribution to journalArticlepeer-review


The efficiency of thin disk accretion onto black holes depends on the inner boundary condition, specifically the torque applied to the disk at the last stable orbit. This is usually assumed to vanish. I estimate the torque on a magnetized disk using a steady magnetohydrodynamic inflow model originally developed by Takahashi et al. I find that the efficiency ∈ can depart significantly from the classical thin disk value. In some cases ∈ > 1, i.e., energy is extracted from the black hole.

Original languageEnglish (US)
Pages (from-to)L57-L60
JournalAstrophysical Journal
Issue number1 PART 2
StatePublished - Sep 1 1999


  • Accretion
  • Accretion disks
  • Black hole physics

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'Efficiency of magnetized thin accretion disks in the Kerr metric'. Together they form a unique fingerprint.

Cite this