Statistical properties of twin kilohertz quasi-periodic oscillations in neutron star low-mass X-ray binaries

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	Statistical properties of twin kilohertz quasi-periodic oscillations in neutron star low-mass X-ray binaries
	Wang, DH; Chen, L; Zhang, CM; Lei, YJ; Qu, JL;屈进禄
刊名	ASTRONOMISCHE NACHRICHTEN
	2014
卷号	335 期号:2 页码:168-177
关键词	accretion methods: statistical stars: neutron X-rays: binaries accretion disks
英文摘要	We collect the data of twin kilohertz quasi-periodic oscillations (kHz QPOs) published before 2012 from 26 neutron star (NS) low-mass X-ray binary (LMXB) sources, then we analyze the centroid frequency (v) distribution of twin kHz QPOs (lower frequency v(1) and upper frequency v(2)) both for Atoll and Z sources. For the data without shift-and-add, we find that Atoll and Z sources show different distributions of v(1), v(2) and v(2)/v(1), but the same distribution of Delta(v) (difference of twin kHz QPOs), which indicates that twin kHz QPOs may share the common properties of LXMBs and have the same physical origins. The distribution of Delta v is quite different from a constant value, so is v(2)/v(1) from a constant ratio. The weighted mean values and maxima of v(1) and v(2) in Atoll sources are slightly higher than those in Z sources. We also find that shift-and-add technique can reconstruct the distributions of v(1) and Delta(v). The K-S test results of v(1) and Delta v between Atoll and Z sources from data with shift-and-add are quite different from those without it, and we think that this may be caused by the selection biases of the sample. We also study the properties of the quality factor (Q) and the root-mean-squared (rms) amplitude of 4U 0614+09 with data from the two observational methods, but the errors are too big to make a robust conclusion. The NS spin frequency (v(s)) distribution of 28 NS-LMXBs show a bigger mean value (similar to 408 Hz) than that (similar to 281Hz) of the radio binary millisecond pulsars (MSPs), which may be due to the lack of the spin detections from Z sources (systematically lower than 281 Hz). Furthermore, on the relations between the kHz QPOs and NS spin frequency v(s), we find the approximate correlations of the mean values of Delta v with NS spin and its half, respectively. (C) 2014 WILEY-VCH Verlag GmbH& Co. KGaA, Weinheim
学科主题	Astronomy & Astrophysics
收录类别	SCI
WOS记录号	WOS:000336590200007
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/224834]
专题	高能物理研究所_粒子天体物理中心
推荐引用方式 GB/T 7714	Wang, DH,Chen, L,Zhang, CM,et al. Statistical properties of twin kilohertz quasi-periodic oscillations in neutron star low-mass X-ray binaries[J]. ASTRONOMISCHE NACHRICHTEN,2014,335(2):168-177.
APA	Wang, DH,Chen, L,Zhang, CM,Lei, YJ,&Qu, JL；屈进禄.(2014).Statistical properties of twin kilohertz quasi-periodic oscillations in neutron star low-mass X-ray binaries.ASTRONOMISCHE NACHRICHTEN,335(2),168-177.
MLA	Wang, DH,et al."Statistical properties of twin kilohertz quasi-periodic oscillations in neutron star low-mass X-ray binaries".ASTRONOMISCHE NACHRICHTEN 335.2(2014):168-177.