2024
Constraining photon trajectories in black hole shadows
PUGLIESE, Daniela and Zdeněk STUCHLÍKBasic information
Original name
Constraining photon trajectories in black hole shadows
Authors
PUGLIESE, Daniela (380 Italy, belonging to the institution) and Zdeněk STUCHLÍK (203 Czech Republic, belonging to the institution)
Edition
European Physical Journal Plus, DE - Spolková republika Německo, 2024, 2190-5444
Other information
Language
English
Type of outcome
Article in a journal
Field of Study
10308 Astronomy
Country of publisher
Germany
Confidentiality degree
is not subject to a state or trade secret
References:
Impact factor
Impact factor: 2.900
RIV identification code
RIV/47813059:19630/24:A0000359
Organization unit
Institute of physics in Opava
UT WoS
001249493300002
EID Scopus
2-s2.0-85196080396
Keywords in English
M87 event horizon; telescope results VI;black-hole;naked singularities;charged-particles;accreation disks;misaligned accreation;runaway instability;galactic-center;kerr;discs
Tags
Tags
International impact, Reviewed
Changed: 15/1/2025 13:25, Mgr. Pavlína Jalůvková
Abstract
In the original language
We examine the shadow cast by a Kerr black hole, focusing on constraints on photons corresponding to different shadow boundaries. The photons are related to different orbital ranges and impact parameter values, creating a map of the shadow boundaries. Our analysis fixes also the conditions under which it is possible to observe an "imprint" of the black hole (outer) ergosurface and (outer) ergoregion on the Kerr black hole shadow boundary. The counter-rotating case resulted strongly constrained with respect to the co-rotating case, constituting a remarkable and significant difference where the counter-rotating component associated with the shadow boundary is strongly distinct from the co-rotating one. However, in this framework, even the co-rotating photons imply restrictions on conditions on the spins and planes, which are bounded by limiting values. We believe the results found here, being a tracer for the central black hole, can constitute new templates for the ongoing observations.