Signal from neutron star obscured by oscillating accretion torus

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19630%2F23%3AA0000274" target="_blank" >RIV/47813059:19630/23:A0000274 - isvavai.cz</a>
Result on the web
<a href="https://proceedings.physics.cz/wp-content/uploads/2023/12/23_25_07_kli.pdf" target="_blank" >https://proceedings.physics.cz/wp-content/uploads/2023/12/23_25_07_kli.pdf</a>
DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Signal from neutron star obscured by oscillating accretion torus
Original language description
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.
Czech name
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Czech description
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Project
<a href="/en/project/GX21-06825X" target="_blank" >GX21-06825X: Accreting Black Holes in the new era of X-ray polarimetry missions</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
Proceedings of RAGtime 23-25: Workshops on black holes and neutron stars
ISBN
9788075105776
ISSN
2336-5668
e-ISSN
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Number of pages
11
Pages from-to
55-65
Publisher name
Slezská univerzita v Opavě, Fyzikální ústav v Opavě
Place of publication
Opava
Event location
Opava
Event date
Nov 27, 2023
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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