The distribution of kHz QPO frequencies in Sco X-1

Tomaso Belloni; Mariano Mendez; Jeroen Homan

The distribution of kHz QPO frequencies in Sco X-1

Tomaso Belloni, Mariano Mendez, Jeroen Homan

Research output: Contribution to conference › Paper › Academic

Abstract

The frequencies of kHz Quasi-Periodic Oscillations in the bright Low-Mass X-ray Binary Sco X-1 have been reported to appear preferentially in a 3:2 ratio. We show that a proper statistical analysis of those RXTE data upon which the claim is based indicated a 2.4 sigma deviation from a constant distribution in ratios. The analysis of a much larger RXTE/PCA dataset shows that there is no sharp concentration around a 3:2 ratio, but that the ratios are broadly distributed over the range 820-1150 Hz.

Original language	English
Pages	339
Publication status	Published - 1-Jan-2005
Externally published	Yes

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@conference{e739c2e556a8419984e4975debd071ef,

title = "The distribution of kHz QPO frequencies in Sco X-1",

abstract = "The frequencies of kHz Quasi-Periodic Oscillations in the bright Low-Mass X-ray Binary Sco X-1 have been reported to appear preferentially in a 3:2 ratio. We show that a proper statistical analysis of those RXTE data upon which the claim is based indicated a 2.4 sigma deviation from a constant distribution in ratios. The analysis of a much larger RXTE/PCA dataset shows that there is no sharp concentration around a 3:2 ratio, but that the ratios are broadly distributed over the range 820-1150 Hz.",

author = "Tomaso Belloni and Mariano Mendez and Jeroen Homan",

year = "2005",

month = jan,

day = "1",

language = "English",

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TY - CONF

T1 - The distribution of kHz QPO frequencies in Sco X-1

AU - Belloni, Tomaso

AU - Mendez, Mariano

AU - Homan, Jeroen

PY - 2005/1/1

Y1 - 2005/1/1

N2 - The frequencies of kHz Quasi-Periodic Oscillations in the bright Low-Mass X-ray Binary Sco X-1 have been reported to appear preferentially in a 3:2 ratio. We show that a proper statistical analysis of those RXTE data upon which the claim is based indicated a 2.4 sigma deviation from a constant distribution in ratios. The analysis of a much larger RXTE/PCA dataset shows that there is no sharp concentration around a 3:2 ratio, but that the ratios are broadly distributed over the range 820-1150 Hz.

AB - The frequencies of kHz Quasi-Periodic Oscillations in the bright Low-Mass X-ray Binary Sco X-1 have been reported to appear preferentially in a 3:2 ratio. We show that a proper statistical analysis of those RXTE data upon which the claim is based indicated a 2.4 sigma deviation from a constant distribution in ratios. The analysis of a much larger RXTE/PCA dataset shows that there is no sharp concentration around a 3:2 ratio, but that the ratios are broadly distributed over the range 820-1150 Hz.

M3 - Paper

SP - 339

ER -

The distribution of kHz QPO frequencies in Sco X-1

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