J 2005

Influence of the relict cosmological constant on accretion discs

STUCHLÍK, Zdeněk

Basic information

Original name

Influence of the relict cosmological constant on accretion discs

Authors

STUCHLÍK, Zdeněk

Edition

Modern Physics Letters A, US - Spojené státy americké, 2005, 0217-7323

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Confidentiality degree

není předmětem státního či obchodního tajemství

Organization unit

Faculty of Philosophy and Science in Opava

DOI

http://dx.doi.org/10.1142/S0217732305016865

UT WoS

000228162800001

Keywords in English

Accretion, accretion discs, black-hole physics, relativity, cosmological constant, jets, radii

Tags

UF

Tags

International impact, Reviewed

Links

MSM4781305903, plan (intention).
Změněno: 18/12/2020 10:18, Mgr. Pavlína Jalůvková

Abstract

V originále

Surprisingly, the relict cosmological constant has a crucial influence on properties of accretion discs orbiting black holes in quasars and active galactic nuclei. We show it by considering basic properties of both the geometrically thin and thick accretion discs in the Kerr - de Sitter black-hole (naked-singularity) spacetimes. Both thin and thick discs must have an outer edge allowing out ow of matter into the outer space, located nearby the so called static radius, where the gravitational attractionof a black hole is balanced by the cosmological repulsion. Jets produced by thick discs can be significantly collimated after crossing the static radius. Extension of discs in quasars is comparable with extension of the associated galaxies, indicating apossibility that the relict cosmological constant puts an upper limit on extension of galaxies.
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