About: Power density spectra of modes of orbital motion in strongly curved space-time: obtaining the observable signal

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About: Power density spectra of modes of orbital motion in strongly curved space-time: obtaining the observable signal Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	High-frequency quasi-periodic oscillations (HF QPOs) appear in the X-ray variability of several accreting low-mass binaries. In this paper, we explore the appearance of an observable signal generated by small radiating circular hotspots moving along quasi-elliptic trajectories close to the innermost stable circular orbit in the Schwarzschild space-time. We find that when a weak signal corresponding to the hotspot Keplerian frequency is around the limits of the RXTE detectability, the LOFT observations can clearly reveal its first and second harmonics. Finally, we also compare the signal produced by the spots to the signal produced by axisymmetric epicyclic disc-oscillation modes and discuss the key differences that could be identified via the proposed future technology. We conclude that the ability to recognize the harmonic content of the signal can help to distinguish between the different proposed physical models. High-frequency quasi-periodic oscillations (HF QPOs) appear in the X-ray variability of several accreting low-mass binaries. In this paper, we explore the appearance of an observable signal generated by small radiating circular hotspots moving along quasi-elliptic trajectories close to the innermost stable circular orbit in the Schwarzschild space-time. We find that when a weak signal corresponding to the hotspot Keplerian frequency is around the limits of the RXTE detectability, the LOFT observations can clearly reveal its first and second harmonics. Finally, we also compare the signal produced by the spots to the signal produced by axisymmetric epicyclic disc-oscillation modes and discuss the key differences that could be identified via the proposed future technology. We conclude that the ability to recognize the harmonic content of the signal can help to distinguish between the different proposed physical models. (en)
Title	Power density spectra of modes of orbital motion in strongly curved space-time: obtaining the observable signal Power density spectra of modes of orbital motion in strongly curved space-time: obtaining the observable signal (en)
skos:prefLabel	Power density spectra of modes of orbital motion in strongly curved space-time: obtaining the observable signal Power density spectra of modes of orbital motion in strongly curved space-time: obtaining the observable signal (en)
skos:notation	RIV/67985815:_____/14:00426969!RIV15-AV0-67985815
http://linked.open...avai/riv/aktivita	I P S
http://linked.open...avai/riv/aktivity	I, P(EE2.3.20.0071), P(GPP209/12/P740), S
http://linked.open...iv/cisloPeriodika	2
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Dovčiak, Michal Karas, Vladimír
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Astronomický ústav AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	38277
http://linked.open...ai/riv/idVysledku	RIV/67985815:_____/14:00426969
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	black holes; accretion disks (en)
http://linked.open.../riv/klicoveSlovo	accretion disks black holes
http://linked.open...odStatuVydavatele	GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV	[74B8C1D6758F]
http://linked.open...i/riv/nazevZdroje	Monthly Notices of the Royal Astronomical Society
http://linked.open...in/vavai/riv/obor	BN
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	11 (xsd:int)
http://linked.open...vavai/riv/projekt	High frequency quasi-periodic oscillations and compact object properties: theory vs. observation Supporting Integration with the International Theoretical and Observational Research Network in Relativistic Astrophysics of Compact Objects
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	439
http://linked.open...iv/tvurceVysledku	Dovčiak, Michal Karas, Vladimír Abramowicz, M. A. Mazur, G. P. Vincent, F. H. Bakala, P. Goluchová, K. Török, G. Wildner, M. Wzientek, D. Šrámková, E.
http://linked.open...ain/vavai/riv/wos	000334114000042
issn	0035-8711
number of pages	7 (xsd:int)
http://bibframe.org/vocab/doi	10.1093/mnras/stu076

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