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, Fan; Qu, Jinlu; Zhang, C. M.; Chen, W.; Li, T. P. |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2006-08-01 |
| 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 |
| 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. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000239647400037 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7129]  |
| 专题 | 国家天文台_射电天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 3.Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China 4.Tsing Hua Univ, Ctr Astrophys, Beijing 100084, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Fan,Qu, Jinlu,Zhang, C. M.,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 | Zhang, Fan,Qu, Jinlu,Zhang, C. M.,Chen, W.,&Li, T. P..(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 | Zhang, Fan,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：国家天文台
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