scholarly journals A Model for Twin Kilohertz Quasi-periodic Oscillations in Neutron Star Low-Mass X-Ray Binaries

2005 ◽  
Vol 635 (1) ◽  
pp. L57-L60 ◽  
Author(s):  
X.-D. Li ◽  
C.-M. Zhang
Keyword(s):  
Neutron Star ◽  
Periodic Oscillations ◽  
X Ray ◽  
Low Mass ◽  
X Ray Binaries

scholarly journals The Beat-Frequency Interpretation of Kilohertz Quasi-periodic Oscillations in Neutron Star Low-Mass X-Ray Binaries

1998 ◽  
Vol 501 (1) ◽  
pp. L95-L99 ◽  
Author(s):  
Dimitrios Psaltis ◽  
Mariano Méndez ◽  
Rudy Wijnands ◽  
Jeroen Homan ◽  
Peter G. Jonker ◽  
...  
Keyword(s):  
Neutron Star ◽  
Beat Frequency ◽  
Periodic Oscillations ◽  
X Ray ◽  
Frequency Interpretation ◽  
Low Mass ◽  
X Ray Binaries

scholarly journals Statistical properties of twin kilohertz quasi-periodic oscillations in neutron star low-mass X-ray binaries

2014 ◽  
Vol 335 (2) ◽  
pp. 168-177 ◽  
Author(s):  
D. H. Wang ◽  
L. Chen ◽  
C. M. Zhang ◽  
Y. J. Lei ◽  
J. L. Qu
Keyword(s):  
Neutron Star ◽  
Statistical Properties ◽  
Periodic Oscillations ◽  
X Ray ◽  
Low Mass ◽  
X Ray Binaries

scholarly journals Detection of millihertz quasi-periodic oscillations in the X-Ray binary 1RXS J180408.9−342058

2020 ◽  
Vol 500 (1) ◽  
pp. 34-39
Author(s):  
Kaho Tse ◽  
Duncan K Galloway ◽  
Yi Chou ◽  
Alexander Heger ◽  
Hung-En Hsieh
Keyword(s):  
Neutron Star ◽  
Power Law ◽  
Numerical Models ◽  
Periodic Oscillations ◽  
X Ray ◽  
Thermonuclear Burning ◽  
Low Mass ◽  
Power Law Noise ◽  
Star Surface ◽  
X Ray Binaries

ABSTRACT Millihertz quasi-periodic oscillations (mHz QPOs) observed in neutron-star low-mass X-ray binaries (NS LMXBs) are generally explained as marginally stable thermonuclear burning on the neutron star surface. We report the discovery of mHz QPOs in an XMM–Newton observation of the transient 1RXS J180408.9−342058, during a regular bursting phase of its 2015 outburst. We found significant periodic signals in the March observation, with frequencies in the range 5–8 $\, \mathrm{mHz}$, superimposed on a strong ∼1/f power-law noise continuum. Neither the QPO signals nor the power-law noise were present during the April observation, which exhibited a 2.5 × higher luminosity and had correspondingly more frequent bursts. When present, the QPO signal power decreases during bursts and disappears afterwards, similar to the behaviour in other sources. 1RXS J180408.9−342058 is the eighth source known to date that exhibits such QPOs driven by thermonuclear burning. We examine the range of properties of the QPO signals in different sources. Whereas the observed oscillation profile is similar to that predicted by numerical models, the amplitudes are significantly higher, challenging their explanation as originating from marginally stable burning.

scholarly journals Links between quasi-periodic oscillations and accretion states in neutron star low-mass X-ray binaries

2017 ◽  
Vol 468 (2) ◽  
pp. 2311-2324 ◽  
Author(s):  
S. E. Motta ◽  
A. Rouco-Escorial ◽  
E. Kuulkers ◽  
T. Muñoz-Darias ◽  
A. Sanna
Keyword(s):  
Neutron Star ◽  
Periodic Oscillations ◽  
X Ray ◽  
Low Mass ◽  
X Ray Binaries

scholarly journals Quasi-Periodic Oscillations in Low-Mass X-ray Binaries

1987 ◽  
Vol 125 ◽  
pp. 321-331
Author(s):  
M. van der Klis
Keyword(s):  
Neutron Star ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Periodic Oscillations ◽  
X Ray ◽  
Low Mass ◽  
X Ray Binaries

The properties of the rapid, persistent quasi-periodic oscillations (QPO) discovered with EXOSAT in the X-ray flux of at least 7 bright low-mass X-ray binaries are described. Particular attention is given to the various relations observed between QPO frequency and X-ray intensity, the link between QPO and the low-frequency noise in the X-ray intensity and the bimodal properties of in particular Sco X-1, GX 5-1 and Cyg X-2. The merits of the hypothesis that the QPO indicate the presence of a neutron star with a magnetosphere are considered.

QUASI PERIODIC OSCILLATIONS IN X-RAY NEUTRON STAR AND PROBES OF PERIHELION PRECESSION OF GENERAL RELATIVITY

2002 ◽  
Vol 11 (04) ◽  
pp. 503-510 ◽  
Author(s):  
C. M. ZHANG
Keyword(s):  
Neutron Star ◽  
Accretion Rate ◽  
Second Harmonic ◽  
Harmonic Frequency ◽  
Periodic Oscillations ◽  
Perihelion Precession ◽  
X Ray ◽  
Outer Disk ◽  
Low Mass ◽  
X Ray Binaries

We ascribe the twin kilohertz Quasi Periodic Oscillations (kHz QPOs) of X-ray spectra of Low Mass X-Ray Binaries (LMXBs) to the pseudo-Newtonian Keplerian frequency and the apogee and perigee precession frequency of the same matter in the inner disk, and ascribe 15–60 Hz QPO (HBO) to the apogee (or perigee) precession and its second harmonic frequency to both apogee and perigee precession in the outer disk boundary of the neutron star (NS) magnetosphere. The radii of the inner and outer disks are correlated each other by a factor of two is assumed. The obtained conclusions include: all QPO frequencies increase and frequency difference of twin kHz QPOs decreases with increasing the accretion rate. The obtained theoretical relations between HBO frequency and twin kHz QPOs are simlilar to the measured empirical formula. Further, the theo-retical formula to calculate the NS mass by the twin kHz QPOs is proposed, and the resultant values are in the range of 1.4 to 1.8 M⊙. QPOs from LMXBs likely provide an accurate laboratory for a strong gravitational field, by which a new method to determine the NS masses of LMXBs is suggested.

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