Quasi-Periodic Oscillations And Noise In Low-Mass X-Ray Binaries
نویسندگان
چکیده
منابع مشابه
Kilohertz Quasi-periodic Oscillations in Low-mass X-ray Binaries
In early 1996 a series of discoveries begun with NASA’s Rossi X-ray Timing Explorer of a new, up to then unknown astrophysical phenomenon. It turned out that accreting low magnetic-field neutron stars show quasi-periodic oscillations in their X-ray flux at rates of up to more than a kilohertz. These kHz QPO, now reported from eleven different systems, are among the fastest phenomena in the sky ...
متن کاملLow Frequency Quasi-periodic Oscillations in Low Mass X-ray Binaries and Galactic Black Hole Candidates
We consider the inner regions of accretion disks surrounding black holes and neutron stars and investigate the nonlinear time dependent evolution of thermal-viscous instabilities. The viscous stress is assumed to be proportional to the gas pressure with the viscosity parameter formulated as α = min[α0(h/r) , αmax], where h is the local scale height, r is the distance from the central compact ob...
متن کاملTiming Spectroscopy of Quasi-Periodic Oscillations in the Low-Mass X-Ray Neutron Star Binaries.
Precise simultaneous measurements of the frequencies of the two kilohertz quasi-periodic oscillations (referred in the literature as upper and lower kHz QPOs) cast doubts on the validity of the simple beat-frequency interpretation and some of the modifications introduced to explain the results of the varying frequency difference. A new model explains the variation of the frequency difference, s...
متن کاملA Model for Twin Kilohertz Quasi-periodic Oscillations in Neutron Star Low-mass X-ray Binaries
We suggest a plausible interpretation for the twin kiloHertz quasi-periodic oscillations (kHz QPOs) in neutron star low-mass X-ray binaries. We identify the upper kHz QPO frequencies to be the rotational frequency and the lower kHz QPOs the standing kink modes of loop oscillations at the inner edge of the accretion disk, respectively. Taking into account the interaction between the neutron star...
متن کاملTiming the Kilohertz Quasi-periodic Oscillations in Low-mass X-ray Binaries
In the past 3 years the Rossi X-ray Timing Explorer has discovered kilohertz quasi-periodic oscillations (kHz QPOs) in the persistent flux of 19 low-mass X-ray binaries (LMXBs). The power density spectra of most of these sources show twin kHz peaks. Initial results seemed to indicate that the frequency separation between the twin kHz peaks, ∆ν = ν2 − ν1, remained constant even as the peaks grad...
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ژورنال
عنوان ژورنال: Annual Review of Astronomy and Astrophysics
سال: 1989
ISSN: 0066-4146
DOI: 10.1146/annurev.astro.27.1.517