J 2019

Effective Geometry of the Bardeen Spacetimes: Gravitational Lensing and Frequency Mapping of Keplerian Disks

SCHEE, Jan and Zdeněk STUCHLÍK

Basic information

Original name

Effective Geometry of the Bardeen Spacetimes: Gravitational Lensing and Frequency Mapping of Keplerian Disks

Authors

SCHEE, Jan (203 Czech Republic, guarantor, belonging to the institution) and Zdeněk STUCHLÍK (203 Czech Republic, belonging to the institution)

Edition

Astrophysical Journal, 2019, 0004-637X

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL

RIV identification code

RIV/47813059:19240/19:A0000423

Organization unit

Faculty of Philosophy and Science in Opava

DOI

http://dx.doi.org/10.3847/1538-4357/ab04f3

UT WoS

000461513000012

Keywords in English

accretion: accretion disks; black hole physics; gravitational lensing: strong

Tags

, GA19-03950S, GB14-37086G, RCTPA, RIVOK

Tags

International impact, Reviewed

Links

GA19-03950S, research and development project. GB14-37086G, research and development project.
Změněno: 21/4/2020 10:29, Ing. Petra Skoumalová

Abstract

V originále

We study the appearance of Keplerian accretion disks in order to demonstrate the influence of the nonlinear electrodynamics (NED) on the gravitational lensing and frequency shifting of the images of the Keplerian disks. We focus our attention on the Bardeen black hole backgrounds with magnetic charges that could be considered to be acceptable solutions for the Einstein gravitational equations combined with those representing an NED. Photons governing the appearance of the Keplerian disks follow null geodesics of the effective geometry related to the Bardeen spacetime. We compare the appearance governed by the effective geometry to those governed by the spacetime geometry itself, and to the appearance of Keplerian disks orbiting a related Reissner-Nordstrom black hole spacetime. We demonstrate a clear and very strong difference between the disk images determined by the effective geometry and the others, both in the shape and (especially) in the frequency mapping where it exhibits a difference of three orders.
Displayed: 20/10/2024 11:47