中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Timing features of the accretion-driven millisecond X-ray pulsar XTE J1807-294 in the 2003 March outburst

文献类型:期刊论文

作者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
刊名ASTROPHYSICAL JOURNAL
出版日期2006
卷号646期号:2页码:1116-1124
关键词accretion, accretion disks binaries : close stars : individual (XTE J1807-294) stars : neutron
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
英文摘要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.
学科主题Astronomy & Astrophysics
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
原文出处SCI
语种英语
WOS记录号WOS:000239647400037
源URL[http://ir.ihep.ac.cn/handle/311005/239075]  
专题高能物理研究所_院士
高能物理研究所_粒子天体物理中心
高能物理研究所_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.

入库方式: OAI收割

来源:高能物理研究所

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