KLIMOVIČOVÁ, Kateřina, Debora LANČOVÁ and Gabriel TÖRÖK. Signal from neutron star obscured by oscillating accretion torus. In Proceedings of RAGtime 23-25: Workshops on black holes and neutron stars. Opava: Slezská univerzita v Opavě, Fyzikální ústav v Opavě, 2023, p. 55-65. ISBN 978-80-7510-577-6.
Other formats:   BibTeX LaTeX RIS
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
Original language English
Type of outcome Proceedings paper
Field of Study 10308 Astronomy
Country of publisher Czech Republic
Confidentiality degree is not subject to a state or trade secret
Publication form printed version "print"
WWW URL
RIV identification code RIV/47813059:19630/23:A0000274
Organization unit Institute of physics in Opava
ISBN 978-80-7510-577-6
ISSN 2336-5668
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.
Changed by Changed by: Mgr. Pavlína Jalůvková, učo 25213. Changed: 26/2/2024 14:14.
Abstract
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.
PrintDisplayed: 17/8/2024 17:20