SCHEE, Jan and Zdeněk STUCHLÍK. Effective Geometry of the Bardeen Spacetimes: Gravitational Lensing and Frequency Mapping of Keplerian Disks. Astrophysical Journal. 2019, vol. 874, No 1, p. "12-1"-"12-10", 10 pp. ISSN 0004-637X. Available from: https://dx.doi.org/10.3847/1538-4357/ab04f3.
Other formats:   BibTeX LaTeX RIS
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
Original 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
WWW 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 FÚ, GA19-03950S, GB14-37086G, RCTPA, RIVOK
Tags International impact, Reviewed
Links GA19-03950S, research and development project. GB14-37086G, research and development project.
Changed by Changed by: Ing. Petra Skoumalová, učo 50554. Changed: 21/4/2020 10:29.
Abstract
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.
PrintDisplayed: 2/5/2024 01:12