2019
Effective Geometry of the Bardeen Spacetimes: Gravitational Lensing and Frequency Mapping of Keplerian Disks
SCHEE, Jan and Zdeněk STUCHLÍKBasic 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
Article in a journal
Field of Study
10308 Astronomy
Country of publisher
United Kingdom of Great Britain and Northern Ireland
Confidentiality degree
is not subject to a state or trade secret
References:
Impact factor
Impact factor: 5.746
RIV identification code
RIV/47813059:19240/19:A0000423
Organization unit
Faculty of Philosophy and Science in Opava
UT WoS
000461513000012
EID Scopus
2-s2.0-85064465016
Keywords in English
accretion: accretion disks; black hole physics; gravitational lensing: strong
Tags
Tags
International impact, Reviewed
Links
GA19-03950S, research and development project. GB14-37086G, research and development project.
Changed: 21/4/2020 10:29, Ing. Petra Skoumalová
Abstract
In the original language
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.