Maximal spin and energy conversion efficiency in a symbiotic system of black hole, disc and jet

Zoltán Kovács, L. Gergely, Peter L. Biermann

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We study a combined model of black hole-accretion disc-magnetosphere-jet symbiosis, applicable for supermassive black holes. We quantify the mass and spin evolution and analyse how the limiting value of the spin parameter and the conversion efficiency of accreted mass into radiation depend on the interplay of the electromagnetic radiation reaction, magnetosphere characteristics and truncation radius of radiation. The dominant effect comes from the closed magnetic field line region, which reduces the spin limit to values ~0.89 (instead ~0.99 in its absence). Therefore, observations on black hole spins could favour or disfavour the existence of the closed magnetic field line region (or its coupling to the disc). We also find that the suppression of radiation from the innermost part of the accretion disc, inferred from observations, and a collimated jet both increase the spin limit and the energy conversion efficiency.

Original languageEnglish
Pages (from-to)991-1009
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Volume416
Issue number2
DOIs
Publication statusPublished - Sep 2011

Fingerprint

energy conversion efficiency
magnetosphere
accretion
magnetic field
electromagnetic radiation
magnetospheres
accretion disks
symbiosis
radiation
magnetic fields
energy conversion
retarding
radii
approximation

Keywords

  • Accretion, accretion discs
  • Black hole physics
  • Galaxies: jets
  • Magnetic fields

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Maximal spin and energy conversion efficiency in a symbiotic system of black hole, disc and jet. / Kovács, Zoltán; Gergely, L.; Biermann, Peter L.

In: Monthly Notices of the Royal Astronomical Society, Vol. 416, No. 2, 09.2011, p. 991-1009.

Research output: Contribution to journalArticle

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