High frequency features in the 1998 outburst of 4U 1630–47

Klein-Wolt, M.; Homan, J.; Klis, M. van der

doi:10.1016/j.nuclphysbps.2004.04.067

Cited by 29 publications

(26 citation statements)

References 26 publications

(34 reference statements)

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“…The remaining two observations lie along a diagonal branch in the HID and also show low noise level. High‐frequency features in this source were reported by Klein‐Wolt et al (). Those are very broad features which depend crucially on the subtraction of Poissonian noise.…”

Section: Resultssupporting

confidence: 75%

High-frequency quasi-periodic oscillations in black hole binaries

Belloni

Sanna

Méndez

2012

Monthly Notices of the Royal Astronomical Society

161

164

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We present the results of the analysis of a large data base of X-ray observations of 22 galactic black hole transients with the Rossi X-Ray Timing Explorer throughout its operative life for a total exposure time of \tilde12 ms. We excluded persistent systems and the peculiar source GRS 1915+105, as well as the most recently discovered sources. The semi-automatic homogeneous analysis was aimed at the detection of high-frequency (100-1000 Hz) quasi-periodic oscillations (QPO), of which several cases were previously reported in the literature. After taking into account the number of independent trials, we obtained 11 detections from two sources only: XTE J1550-564 and GRO J1655-40. For the former, the detected frequencies are clustered around 180 and 280 Hz, as previously found. For the latter, the previously reported dichotomy 300-450 Hz is found to be less sharp. We discuss our results in comparison with kHz QPO in neutron-star X-ray binaries and the prospects for future timing X-ray missions

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Section: Resultssupporting

confidence: 75%

High-frequency quasi-periodic oscillations in black hole binaries

Belloni

Sanna

Méndez

2012

Monthly Notices of the Royal Astronomical Society

161

164

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“…We constructed power spectra per observation (see above) using data segments of 256 s and 1/8192 s time bins such that the lowest available frequency was 1/256 Hz and the Nyquist frequency was 4096 Hz; the normalization of Leahy et al (1983) was used. We subtracted a Poisson noise level using the method of M. Klein-Wolt et al (2004), which is built on the analytical function from Zhang et al (1995). The resulting power spectra were then converted to squared fractional rms values.…”

Section: Timing Gmentioning

confidence: 99%

Relations between Timing Features and Colors in Accreting Millisecond Pulsars

Straaten

Klis

Wijnands

2005

ApJ

175

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We have studied the aperiodic X-ray timing and color behavior of the accreting millisecond pulsars SAX J1808.4À3658, XTE J1751À305, XTE J0929À314, and XTE J1814À338 using large data sets obtained with the Rossi X-Ray Timing Explorer. We find that the accreting millisecond pulsars have timing properties very similar to atoll sources and low-luminosity bursters. On the basis of the correlation of timing and color behavior, SAX J1808.4À3658 can be classified as an atoll source, and XTE J0929À314 and XTE J1814À338 are consistent with atoll sources, but the color behavior of XTE J1751À305 is different. Unlike the color in other atoll sources, the hard color in the extreme island state of XTE J1751À305 is strongly correlated with soft color and intensity and is not anticorrelated with any of the characteristic frequencies. We found previously that the frequencies of the variability components of atoll sources follow a universal scheme of correlations. The frequency correlations of the accreting millisecond pulsars are similar, but in the cases of SAX J1808.4À3658 and XTE J0929À314 they are shifted compared with those of the other atoll sources in a way that is most easily described as a shift in upper and lower kilohertz quasi-periodic oscillation (QPO) frequency by a factor close to 1.5. However, we note that the shift in the lower kilohertz QPO frequency is based on only one observation for SAX J1808.4À3658. XTE J1751À305 and XTE J1814À338, as well as the low-luminosity bursters, show no or possibly only small shifts.

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“…Single QPOs or peaked noise (i.e., when Q 2) features at a rather stable frequency have been detected in XTE J1650-500 (∼250 Hz; see, e.g., , 4U 1630-47 (variable frequency; see Klein-Wolt et al 2004), and XTE J1859+226 (∼180 Hz; see, e.g., Cui et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Discovery of High-Frequency Quasi-Periodic Oscillations in the Black Hole Candidate Igr J17091–3624

Altamirano

Belloni

2012

ApJ

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We report the discovery of 8.5σ high-frequency quasi-periodic oscillations (HFQPOs) at 66 Hz in the Rossi X-ray Timing Explorer data of the black hole candidate IGR J17091−3624, a system whose X-ray properties are very similar to those of microquasar GRS 1915+105. The centroid frequency of the strongest peak is ∼66 Hz, its quality factor above five, and its rms is between 4% and 10%. We found a possible additional peak at 164 Hz when selecting a subset of the data; however, at the 4.5σ level we consider this detection marginal. These QPOs have hard spectrum and are stronger in observations performed between 2011 September and October, during which IGR J17091−3624 displayed for the first time light curves that resemble those of the γ variability class in GRS 1915+105. We find that the 66 Hz QPO is also present in previous observations (4.5σ ), but only when averaging ∼235 ks of relatively high count rate data. The fact that the HFQPOs frequency in IGR J17091−3624 matches surprisingly well with that seen in GRS 1915+105 raises questions on the mass scaling of QPOs frequency in these two systems. We discuss some possible interpretations; however, they all strongly depend on the distance and mass of IGR J17091−3624, both completely unconstrained today.

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High frequency features in the 1998 outburst of 4U 1630–47

Cited by 29 publications

References 26 publications

High-frequency quasi-periodic oscillations in black hole binaries

High-frequency quasi-periodic oscillations in black hole binaries

Relations between Timing Features and Colors in Accreting Millisecond Pulsars

Discovery of High-Frequency Quasi-Periodic Oscillations in the Black Hole Candidate Igr J17091–3624

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