Kilohertz Quasi-periodic Oscillation and Atoll Source States in 4U 0614+09
نویسندگان
چکیده
منابع مشابه
Kilohertz Quasi-periodic Oscillation and Atoll Source States
We report three RXTEyPCA observations of the low-mass X-ray binary 4U 0614109. They show strong (130% rms) band-limited noise with a cutoff frequency varying between 0.7 and 15 Hz in correlation with the X-ray flux, fX. We observe two nonsimultaneous 11%–15% (rms) kHz peaks near 728 and 629 Hz in the power spectra of two of our observations when fX 1 10 ergs cm s (2–10 keV) but find no quasi-pe...
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We present new Rossi X-ray Timing Explorer observations of the low-mass X-ray binary 4U 1608–52 during the decay of its 1998 outburst. We detect by a direct FFT method the existence of a second kilohertz quasi-periodic oscillation (kHz QPO) in its power density spectrum, previously only seen by means of the sensitivity-enhancing ‘shift and add’ technique. This result confirms that 4U 1608–52 is...
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We discovered a single kHz quasi-periodic oscillation (QPO) near 1150 Hz in the Rossi X-ray Timing Explorer X-ray light curve of the low mass X-ray binary and atoll source 4U 1735−44. The rms amplitude of this peak was 2–3 %, and the FWHM 6–40 Hz. There are indications that the kHz QPO frequency decreased from 1160 Hz to 1145 Hz when the count rate increased, which would be quite different from...
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We present results of Rossi X-Ray Timing Explorer (RXTE) observations of the atoll source 4U 1702−429 in the middle of its luminosity range. Kilohertzrange quasiperiodic oscillations (QPOs) were observed first as a narrow (FWHM ∼7 Hz) peak near 900 Hz, and later as a pair consisting of a narrow peak in the range 625–825 Hz and a faint broad (FWHM 91 Hz) peak. When the two peaks appeared simulta...
متن کاملKilohertz Quasi-periodic Oscillation Peak Separation Is Not Constant in Scorpius X-1 Michiel
We report on a series of 20,110 counts s, 0.125 ms time-resolution Rossi X-Ray Timing Explorer observations of the Z-source and low-mass X-ray binary Scorpius X-1. Twin kilohertz quasi-periodic oscillation (QPO) peaks are obvious in nearly all observations. We find that the peak separation is not constant, as expected in some beat-frequency models, but instead varies from 1310 to 1230 Hz when t...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1997
ISSN: 0004-637X
DOI: 10.1086/310803