The energy dependence of the centroid frequency of the low-frequency quasi-periodic oscillations in XTE J1550-564

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	The energy dependence of the centroid frequency of the low-frequency quasi-periodic oscillations in XTE J1550-564
	Li, ZB; Qu JL(屈进禄); Song LM(宋黎明); Qu, JL; Song, LM; Ding, GQ; Zhang, CM; Song LM(宋黎明); Qu JL(屈进禄)
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2013
卷号	428 期号:2 页码:1704-1714
关键词	accretion black hole physics stars: individual: XTE J1550-564 stars: low-mass stars: oscillations X-rays: binaries accretion discs
英文摘要	In this paper, we investigate the energy dependence of the centroid frequency of the low-frequency quasi-periodic oscillations (QPOs; 0.08-20 Hz) in XTE J1550-564. We have used the observational data from the Rossi X-ray Timing Explorer during the first half part of the 1998-1999 outburst. We have found that the centroid frequency of the fundamental QPO did not vary with photon energy when its QPO frequency was less than similar to 0.4-0.8 Hz and it did not increase much when its frequency was between similar to 0.8 and similar to 3.3 Hz. However, it clearly increased with photon energy when it was larger than similar to 3.3 Hz. The most interesting point is that it increased much more quickly with photon energy when its centroid frequency was between similar to 6 and similar to 8.5 Hz. Subsequently, its rising rate dropped sharply when its frequency was larger than similar to 8.5 Hz. We have also investigated the dependence of the first-harmonic and subharmonic QPO frequency on photon energy. We have found that for more than 70 per cent of the subharmonic QPO observations, the frequency increased with the photon energy, while the rest did not change obviously. Meanwhile, similar to 60 per cent of the first-harmonic QPOs exhibited a negative correlation between their frequencies and photon energy, while the remaining correlations were irregular. For the amplitudes of the QPOs, complicated dependences on photon energy were also found. The amplitudes of the first-harmonic and subharmonic QPOs have shown a similar correlation with photon energy (i.e. their amplitudes increased with photon energy until similar to 6-7 keV, beyond which the amplitudes decreased). By contrast, the fundamental QPO amplitude increased until similar to 10 keV and became saturated toward higher energies. These newly discovered patterns of the dependence of QPOs on photon energy cannot be easily explained in the currently existing frames of QPO models. Therefore, they provide an important insight into our understanding of QPO physics.
学科主题	Astronomy & Astrophysics
收录类别	SCI
WOS记录号	WOS:000318229000060
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/224164]
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	Li, ZB,Qu JL,Song LM,et al. The energy dependence of the centroid frequency of the low-frequency quasi-periodic oscillations in XTE J1550-564[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,428(2):1704-1714.
APA	Li, ZB.,屈进禄.,宋黎明.,Qu, JL.,Song, LM.,...&Qu JL.(2013).The energy dependence of the centroid frequency of the low-frequency quasi-periodic oscillations in XTE J1550-564.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,428(2),1704-1714.
MLA	Li, ZB,et al."The energy dependence of the centroid frequency of the low-frequency quasi-periodic oscillations in XTE J1550-564".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 428.2(2013):1704-1714.