J 2023

Extreme amplification regimes of the Schwarzschild gravitational lens

BAKALA, Pavel, Alena BAKALOVA, Riccardo LA PLACA, Maurizio FALANGA, Luigi STELLA et. al.

Basic information

Original name

Extreme amplification regimes of the Schwarzschild gravitational lens

Authors

BAKALA, Pavel (203 Czech Republic, belonging to the institution), Alena BAKALOVA, Riccardo LA PLACA, Maurizio FALANGA and Luigi STELLA

Edition

ASTRONOMY & ASTROPHYSICS, LES ULIS CEDEX A, EDP SCIENCES S A, 2023, 0004-6361

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

France

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL

RIV identification code

RIV/47813059:19630/23:A0000322

Organization unit

Institute of physics in Opava

DOI

http://dx.doi.org/10.1051/0004-6361/202245426

UT WoS

001004184500016

Keywords in English

gravitational lensing;strong;black hole physics;methods;analytical

Tags

RIV24, UF

Tags

International impact, Reviewed
Změněno: 5/2/2024 08:35, Mgr. Pavlína Jalůvková

Abstract

V originále

We investigated a complete set of relativistic images of a small source located at an arbitrary distance from a Schwarzschild black hole gravitational lens. This paper offers a description of a simple and efficient fully relativistic method for calculating the bolometric intensity amplification. We focused our analysis primarily on sources located at small radii and close angular distance from the caustic line, both behind and in front of the compact lens. We term the corresponding large deflection regime 'extreme lensing'. We approximated the regime of fully-relativistic, extreme amplification of point sources by simple analytical formulae valid over a wide range of source distances. Using such approximations, we also derived formulae for the maximum amplification of extended sources close to or intercepted by the caustic line. Simple analytical approximations of the time delay between the brightest consecutive images in extreme amplification regimes are also presented.
Displayed: 25/12/2024 07:19