Twin peak quasi-periodic oscillations as signature of oscillating cusp torus

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F16%3A00471579" target="_blank" >RIV/67985815:_____/16:00471579 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1093/mnrasl/slv196" target="_blank" >http://dx.doi.org/10.1093/mnrasl/slv196</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnrasl/slv196" target="_blank" >10.1093/mnrasl/slv196</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Twin peak quasi-periodic oscillations as signature of oscillating cusp torus

Popis výsledku v původním jazyce

Serious theoretical effort has been devoted to explain the observed frequencies of twin-peak quasi-periodic oscillations (HF QPOs) observed in low-mass X-ray neutron star binaries. Here we propose a new model of HF QPOs. Within its framework we consider an oscillating torus with cusp that changes location r(0) of its centre around radii very close to innermost stable circular orbit. The observed variability is assigned to global modes of accreted fluid motion that may give strong modulation of both accretion disc radiation and the accretion rate. For a given space-time geometry, the model predicts that QPO frequencies are function of single parameter r(0). We illustrate that the model can provide fits of data comparable to those reached by other models, or even better. In particular, it is compared to relativistic precession model. Moreover, we also illustrate that the model consideration is compatible with consideration of models of a rotating neutron star in the atoll source 4U 1636-53.

Název v anglickém jazyce

Twin peak quasi-periodic oscillations as signature of oscillating cusp torus

Popis výsledku anglicky

Serious theoretical effort has been devoted to explain the observed frequencies of twin-peak quasi-periodic oscillations (HF QPOs) observed in low-mass X-ray neutron star binaries. Here we propose a new model of HF QPOs. Within its framework we consider an oscillating torus with cusp that changes location r(0) of its centre around radii very close to innermost stable circular orbit. The observed variability is assigned to global modes of accreted fluid motion that may give strong modulation of both accretion disc radiation and the accretion rate. For a given space-time geometry, the model predicts that QPO frequencies are function of single parameter r(0). We illustrate that the model can provide fits of data comparable to those reached by other models, or even better. In particular, it is compared to relativistic precession model. Moreover, we also illustrate that the model consideration is compatible with consideration of models of a rotating neutron star in the atoll source 4U 1636-53.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BN - Astronomie a nebeská mechanika, astrofyzika

OECD FORD obor

—

Projekt

<a href="/cs/project/LH14049" target="_blank" >LH14049: Spektrální a časové charakteristiky vesmírných černých děr</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

—

Svazek periodika

457

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

5

Strana od-do

"L19"-"L23"

Kód UT WoS článku

000378094600005

EID výsledku v databázi Scopus

2-s2.0-84960089155