Morphological analysis on the coherence of kHz QPOs

	Morphological analysis on the coherence of kHz QPOs
	Wang, J; Chang, HK; Zhang, CM; Wang, DH; Chen, L; Qu, JL; Song, LM;屈进禄; Song LM(宋黎明)
刊名	ASTROPHYSICS AND SPACE SCIENCE
	2012
卷号	342 期号:2 页码:357-364
关键词	Accretion: accretion disks Stars: neutron Binaries: close X-rays: stars Pulsar
英文摘要	We take the recently published data of twin kHz quasi-period oscillations (QPOs) in neutron star (NS) low-mass X-ray binaries (LMXBs) as the samples, and investigate the morphology of the samples, which focuses on the quality factor, peak frequency of kHz QPOs, and try to infer their physical mechanism. We notice that: (1) The quality factors of upper kHz QPOs are low (2 similar to 20 in general) and increase with the kHz QPO peak frequencies for both Z and Atoll sources. (2) The distribution of quality factor versus frequency for the lower kHz QPOs are quite different between Z and Atoll sources. For most Z source samples, the quality factors of lower kHz QPOs are low (usually lower than 15) and rise steadily with the peak frequencies except for Sco X-1, which drop abruptly at the frequency of about 750 Hz. While for most Atoll sources, the quality factors of lower kHz QPOs are very high (from 2 to 200) and usually have a rising part, a maximum and an abrupt drop. (3) There are three Atoll sources (4U 1728-34, 4U 1636-53 and 4U 1608-52) of displaying very high quality factors for lower kHz QPOs. These three sources have been detected with the spin frequencies and sidebands, in which the source with higher spin frequency presents higher quality factor of lower kHz QPOs and lower difference between sideband frequency and lower kHz QPO frequency.
学科主题	Astronomy & Astrophysics
收录类别	SCI
WOS记录号	WOS:000310222700008
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/223952]
专题	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Wang, J,Chang, HK,Zhang, CM,et al. Morphological analysis on the coherence of kHz QPOs[J]. ASTROPHYSICS AND SPACE SCIENCE,2012,342(2):357-364.
APA	Wang, J.,Chang, HK.,Zhang, CM.,Wang, DH.,Chen, L.,...&宋黎明.(2012).Morphological analysis on the coherence of kHz QPOs.ASTROPHYSICS AND SPACE SCIENCE,342(2),357-364.
MLA	Wang, J,et al."Morphological analysis on the coherence of kHz QPOs".ASTROPHYSICS AND SPACE SCIENCE 342.2(2012):357-364.