D 2023

Signal from neutron star obscured by oscillating accretion torus

KLIMOVIČOVÁ, Kateřina, Debora LANČOVÁ and Gabriel TÖRÖK

Basic information

Original name

Signal from neutron star obscured by oscillating accretion torus

Authors

KLIMOVIČOVÁ, Kateřina (203 Czech Republic, belonging to the institution), Debora LANČOVÁ (203 Czech Republic, belonging to the institution) and Gabriel TÖRÖK (203 Czech Republic, belonging to the institution)

Edition

Opava, Proceedings of RAGtime 23-25: Workshops on black holes and neutron stars, p. 55-65, 11 pp. 2023

Publisher

Slezská univerzita v Opavě, Fyzikální ústav v Opavě

Other information

Language

English

Type of outcome

Stať ve sborníku

Field of Study

10308 Astronomy

Country of publisher

Czech Republic

Confidentiality degree

není předmětem státního či obchodního tajemství

Publication form

printed version "print"

References:

URL

RIV identification code

RIV/47813059:19630/23:A0000274

Organization unit

Institute of physics in Opava

ISBN

978-80-7510-577-6

ISSN

Keywords in English

Black hole; neutron star; rapid variability; X–ray binary

Tags

RIV24, SGS-31-2023, UF

Tags

International impact, Reviewed

Links

GX21-06825X, research and development project.
Změněno: 26/2/2024 14:14, Mgr. Pavlína Jalůvková

Abstract

V originále

X-ray fluxes of low-mass neutron star binaries reveal rapid, nearly periodic changes corresponding to frequencies in the order of hundreds of hertz. Two closely related peaks often appear in the power spectral density and are designated as twin-peak Quasi-Periodic Oscillations (QPOs). Some QPO models attribute the observed effects to the torus oscillating in the inner region of the accretion flow. Since the observed variability is very strong, oscillations of a torus can be reflected in the observed light curves either by modulation of an accretion flow and/or by a periodic obscuration of a hot region on the neutron star surface. Applying a self-consistent description of the oscillations and full relativistic ray tracing, we analyse how the obscuration effect can affect the light curve detected by a distant observer. Within the same paradigm, we also investigate a possible product of torus instability and the implied signature of the Keplerian frequency in the light curve.
Displayed: 24/12/2024 18:37