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

文献类型：期刊论文

作者Qu, JL; Wang, DH; Zhang, CM; Qu JL(屈进禄); Yang, YY
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2018
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
DOI10.1093/mnras/stx2578
文献子类Article
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.
电子版国际标准刊号1365-2966
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
WOS记录号WOS:000424117300042
源URL[http://ir.ihep.ac.cn/handle/311005/285600]  
专题高能物理研究所_粒子天体物理中心
作者单位中国科学院高能物理研究所
推荐引用方式
GB/T 7714		 Qu, JL,Wang, DH,Zhang, CM,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 Qu, JL,Wang, DH,Zhang, CM,屈进禄,&Yang, YY.(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 Qu, JL,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.

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来源：高能物理研究所

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