On The Low Frequency Quasi Periodic Oscillations Of X-Ray Sources
نویسندگان
چکیده
منابع مشابه
On The Low Frequency Quasi Periodic Oscillations of X-ray Sources
Based on the interpretation of the twin kilohertz Quasi Periodic Oscillations (kHz QPOs) of X-ray spectra of Low Mass X-Ray Binaries (LMXBs) to the Keplerian and the periastron precession frequencies at the magnetosphere-disk of X-ray neutron star (NS) respectively, we ascribe the low frequency Quasi Periodic Oscillations (LFQPO) and HBO (15-60 Hz QPO for Z sources or Atoll sources) to the peri...
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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 ...
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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 کاملThe Abc of Low-frequency Quasi-periodic Oscillations in Black-hole Candidates: Analogies with Z-sources
Three main types of low-frequency quasi-periodic oscillations (LFQPOs) have been observed in Black Hole Candidates. We re-analyzed RXTE data of the bright systems XTE J1859+226, XTE J1550-564 and GX 339-4, which show all three of them. We review the main properties of these LFQPOs and show that they follow a well-defined correlation in a fractional rms vs. softness diagram. We show that the fre...
متن کاملKilohertz Quasi-periodic Oscillations in Low-Mass X-Ray Binary Sources and Their Relation to the Neutron Star Magnetic Field.
Starting from the observation that kilohertz quasi-periodic oscillations (kHz QPOs) occur in a very narrow range of X-ray luminosities in neutron star low-mass X-ray binaries, we try to link the kHz QPO observability to variations of the neutron star magnetospheric radius, in response to changing mass inflow rate. At low luminosities, the drop-off of kHz QPO activity may be explained by the ons...
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ژورنال
عنوان ژورنال: Astrophysics and Space Science
سال: 2005
ISSN: 0004-640X,1572-946X
DOI: 10.1007/s10509-005-5901-1