Constraining Models of Twin-Peak Quasi-periodic Oscillations with Realistic Neutron Star Equations of State

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F16%3A00471581" target="_blank" >RIV/67985815:_____/16:00471581 - isvavai.cz</a>

Alternative codes found

RIV/47813059:19240/16:N0000026

Result on the web

<a href="http://dx.doi.org/10.3847/1538-4357/833/2/273" target="_blank" >http://dx.doi.org/10.3847/1538-4357/833/2/273</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-4357/833/2/273" target="_blank" >10.3847/1538-4357/833/2/273</a>

Result language

angličtina

Original language name

Constraining Models of Twin-Peak Quasi-periodic Oscillations with Realistic Neutron Star Equations of State

Original language description

Twin-peak quasi-periodic oscillations (QPOs) are observed in the X-ray power-density spectra of several accreting low-mass neutron star (NS) binaries. In our previous work we have considered several QPO models. We have identified and explored mass-angular-momentum relations implied by individual QPO models for the atoll source 4U 1636-53. In this paper we extend our study and confront QPO models with various NS equations of state (EoS). We start with simplified calculations assuming Kerr background geometry and then present results of detailed calculations considering the influence of NS quadrupole moment (related to rotationally induced NS oblateness) assuming Hartle-Thorne spacetimes. We show that the application of concrete EoS together with a particular QPO model yields a specific mass-angular-momentum relation. However, we demonstrate that the degeneracy in mass and angular momentum can be removed when the NS spin frequency inferred from the X-ray burst observations is considered. We inspect a large set of EoS and discuss their compatibility with the considered QPO models. We conclude that when the NS spin frequency in 4U. 1636-53 is close to 580 Hz, we can exclude 51 of the 90 considered combinations of EoS and QPO models. We also discuss additional restrictions that may exclude even more combinations. Namely, 13 EOS are compatible with the observed twin-peak QPOs and the relativistic precession model. However, when considering the low-frequency QPOs and Lense-Thirring precession, only 5 EOS are compatible with the model.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BN - Astronomy and celestial mechanics, astrophysics

OECD FORD branch

—

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

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

Name of the periodical

Astrophysical Journal

ISSN

0004-637X

e-ISSN

—

Volume of the periodical

833

Issue of the periodical within the volume

2

Country of publishing house

US - UNITED STATES

Number of pages

11

Pages from-to

"273/1"-"273/11"

UT code for WoS article

000391169600148

EID of the result in the Scopus database

2-s2.0-85008162859