Correlations between the frequencies of twin kHz QPOs and spins of neutron stars in LMXBs

doi:10.1093/mnras/stx2578

CORC > 国家天文台 > 中国科学院国家天文台

	Correlations between the frequencies of twin kHz QPOs and spins of neutron stars in LMXBs
	Wang, De-Hua 5; Zhang, Cheng-Min 1,2,6; Qu, Jin-Lu 3; Yang, Yi-Yan 4
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2018-02-01
卷号	473 期号:4 页码:4862-4867
关键词	accretion, accretion discs binaries: close stars: neutron X-rays: binaries
ISSN号	0035-8711
DOI	10.1093/mnras/stx2578
英文摘要	We investigate the correlation between the frequencies of twin kilohertz quasi-periodic oscillations (kHz QPOs) and neutron star (NS) spins in low-mass X-ray binaries (LMXBs), based on the data sets of 12 sources with simultaneously detected twin kHz QPOs and NS spins, and find that the histogram of the ratio between the frequency difference of twin kHz QPOs (Delta nu nu(2) - nu(1)) and NS spin nu(s) shows a non-uniform distribution with a gap at Delta nu/nu(s) similar to 0.65. We try to classify the 12 sources into two categories according to this gap: (I) slow rotators with similar to 311 Hz, XTE J1807.4-294, 4U 1915-05, IGR J17191-2821, 4U 1702-43, 4U 1728-34 and 4U 0614+09 follow a relation Delta nu/nu(s) > 0.65; (II) fast rotators with similar to 546 Hz, SAX J1808.4-3658, KS 1731-260, Aql X-1, 4U 1636-53, SAX J1750.8-2900 and 4U 1608-52 satisfy the relation Delta nu/nu(s) < 0.65. However, the linear fittings of Delta nu versus nu(s) relations of groups (I) and (II) are unsatisfactory to ensure any certain correlations. We suggest that this phenomenon may arise from the fact that most measured kHz QPOs and spins satisfy the conditions of 1.1 nu(s) <= nu(2) < 1300 Hz and Delta nu decreasing with nu(2). Apparently, the diversified distribution of Delta nu/nu(s) refutes the simple beat-frequency model, and the statistical correlations between the twin kHz QPOs and NS spins may arise from the magnetosphere-disc boundary environments, e.g. co-rotation radius and NS radius, that modulate the occurrences of X-ray signals. Furthermore, we also find a distribution of the ratio of nu(2) to nu(1) clusters around the value of similar to 3: 2, which shows no obvious correlation with NS spins.
资助项目	National Program on Key Research and Development Project[2016YFA0400803] ; National Natural Science Foundation of China[11173034] ; National Natural Science Foundation of China[11673023] ; National Natural Science Foundation of China[11703003] ; Science and Technology Foundation of Guizhou Province[J[2015]2113] ; Science and Technology Foundation of Guizhou Province[LH[2016]7226] ; Doctoral Starting up Foundation of Guizhou Normal University
WOS关键词	QUASI-PERIODIC OSCILLATIONS ; X-RAY BINARIES ; ACCRETING MILLISECOND PULSAR ; ATOLL SOURCE STATES ; 4U 1636-53 ; TIMING FEATURES ; PEAK SEPARATION ; BLACK-HOLE ; DISCOVERY ; RESONANCE
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000424117300042
资助机构	National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Science and Technology Foundation of Guizhou Province ; Science and Technology Foundation of Guizhou Province ; Doctoral Starting up Foundation of Guizhou Normal University ; Doctoral Starting up Foundation of Guizhou Normal University ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Science and Technology Foundation of Guizhou Province ; Science and Technology Foundation of Guizhou Province ; Doctoral Starting up Foundation of Guizhou Normal University ; Doctoral Starting up Foundation of Guizhou Normal University ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Science and Technology Foundation of Guizhou Province ; Science and Technology Foundation of Guizhou Province ; Doctoral Starting up Foundation of Guizhou Normal University ; Doctoral Starting up Foundation of Guizhou Normal University ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Science and Technology Foundation of Guizhou Province ; Science and Technology Foundation of Guizhou Province ; Doctoral Starting up Foundation of Guizhou Normal University ; Doctoral Starting up Foundation of Guizhou Normal University
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/37404]
专题	中国科学院国家天文台
通讯作者	Wang, De-Hua; Zhang, Cheng-Min
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Key Lab Radio Astron, Beijing 100012, Peoples R China 3.Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China 4.Guizhou Educ Univ, Sch Phys & Elect Sci, Guiyang 550018, Guizhou, Peoples R China 5.Guizhou Normal Univ, Sch Phys & Elect Sci, Guiyang 550001, Guizhou, Peoples R China 6.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wang, De-Hua,Zhang, Cheng-Min,Qu, Jin-Lu,et al. Correlations between the frequencies of twin kHz QPOs and spins of neutron stars in LMXBs[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,473(4):4862-4867.
APA	Wang, De-Hua,Zhang, Cheng-Min,Qu, Jin-Lu,&Yang, Yi-Yan.(2018).Correlations between the frequencies of twin kHz QPOs and spins of neutron stars in LMXBs.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,473(4),4862-4867.
MLA	Wang, De-Hua,et al."Correlations between the frequencies of twin kHz QPOs and spins of neutron stars in LMXBs".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 473.4(2018):4862-4867.