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Timing features of the accretion-driven millisecond X-ray pulsar XTE J1807-294 in the 2003 March outburst
Zhang F(张帆); Qu JL(屈进禄); Chen W(陈尉); Li TB(李惕碚); Zhang, F; Qu, JL; Zhang, CM; Chen, W; Li, TP
2006
发表期刊ASTROPHYSICAL JOURNAL
卷号646期号:2页码:1116-1124
通讯作者Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China ; Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China ; Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China ; Tsing Hua Univ, Ctr Astrophys, Beijing 100084, Peoples R China
摘要In order to probe the activity of the inner disk flow and its effect on the neutron star surface emissions, we carried out a timing analysis of the Rossi X-Ray Timing Explorer observations of the millisecond X-ray pulsar XTE J1807 - 294, focusing on its correlated behaviors in X-ray intensities, hardness ratios, pulse profiles, and power density spectra. The source was observed to have a series of broad "puny'' flares on a timescale of hours to days on top of a decaying outburst in 2003 March. In the flares, the spectra are softened, and the pulse profiles become more sinusoidal. The frequency of kilohertz quasi-periodic oscillation (kHz QPO) is found to be positively related to the X-ray count rate in the flares. These features observed in the flares could be due to the accreting flow inhomogeneities. It is noted that the fractional pulse amplitude increases with the flare intensities in a range of similar to 2% - 14%, comparable to those observed in the thermonuclear bursts of the millisecond X-ray pulsar XTE J1814 - 338, whereas it remains at about 6.5% in the normal state. Such a significant variation of the pulse profile in the puny flares may reflect the changes of physical parameters in the inner disk accretion region. Furthermore, we noticed an overall positive correlation between the kHz QPO frequency and the fractional pulse amplitude, which could be the first evidence that the neutron star surface emission properties are very sensitive to the disk flow inhomogeneities. This effect should be cautiously considered in the burst oscillation studies.
文章类型Article
关键词accretion, accretion disks binaries : close stars : individual (XTE J1807-294) stars : neutron
学科领域Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
DOI10.1086/502673
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语种英语
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000239647400037
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被引频次:21[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/239075
专题院士
粒子天体物理中心
多学科研究中心
作者单位中国科学院高能物理研究所
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Zhang F,Qu JL,Chen W,et al. Timing features of the accretion-driven millisecond X-ray pulsar XTE J1807-294 in the 2003 March outburst[J]. ASTROPHYSICAL JOURNAL,2006,646(2):1116-1124.
APA 张帆.,屈进禄.,陈尉.,李惕碚.,Zhang, F.,...&Li, TP.(2006).Timing features of the accretion-driven millisecond X-ray pulsar XTE J1807-294 in the 2003 March outburst.ASTROPHYSICAL JOURNAL,646(2),1116-1124.
MLA 张帆,et al."Timing features of the accretion-driven millisecond X-ray pulsar XTE J1807-294 in the 2003 March outburst".ASTROPHYSICAL JOURNAL 646.2(2006):1116-1124.
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