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The kilohertz QPO frequency and flux decrease in Aquila X-l and the effect of soft X-ray spectral components
Yu, W; Li TB(李惕碚); Zhang SN(张双南); Li, TP; Zhang, W; Zhang, SN
1999
发表期刊ASTROPHYSICAL JOURNAL
卷号512期号:1页码:L35-L38
通讯作者NASA, High Energy Astrophys Lab, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA ; Univ Alabama, Dept Phys, Huntsville, AL 35899 USA ; NASA, George C Marshall Space Flight Ctr, Huntsville, AL 35812 USA
文章类型Article
摘要We report on a Rossi X-Ray Timing Explorer observation of Aquila X-l during its outburst in 1997 March in which, immediately following a type I burst, the broadband 2-10 keV flux decreased by about 10% and the kilohertz quasi-periodic oscillation (kHz QPO) frequency decreased from 813 +/- 3 to 776 +/- 4 Hz. This change in kHz QPO frequency is much larger than expected from a simple extrapolation of a frequency-flux correlation that was established in data before the burst. Meanwhile, a very low frequency noise component in the broadband fast Fourier transform power spectra, with a fractional rms amplitude of 1.2% before the burst, ceased to exist after the burst. All these changes were accompanied by a change in the energy spectral shape. If we characterize the energy spectra with a model composed of two blackbody (BB) components and a power-law component, almost all the decrease in flux was in the two BE components. We attribute the two BE components to the contributions from a region very near the neutron star, or even from the neutron star itself, and from the accretion disk, respectively.
关键词stars : individual (Aquila X-l) stars : neutron X-rays : stars
学科领域Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics ; Astronomy & Astrophysics
DOI10.1086/311859
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语种英语
研究领域[WOS]Astronomy & Astrophysics ; Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000079251300010
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被引频次:19[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/311005/240269
专题院士
作者单位中国科学院高能物理研究所
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Yu, W,Li TB,Zhang SN,et al. The kilohertz QPO frequency and flux decrease in Aquila X-l and the effect of soft X-ray spectral components[J]. ASTROPHYSICAL JOURNAL,1999,512(1):L35-L38.
APA Yu, W,李惕碚,张双南,Li, TP,Zhang, W,&Zhang, SN.(1999).The kilohertz QPO frequency and flux decrease in Aquila X-l and the effect of soft X-ray spectral components.ASTROPHYSICAL JOURNAL,512(1),L35-L38.
MLA Yu, W,et al."The kilohertz QPO frequency and flux decrease in Aquila X-l and the effect of soft X-ray spectral components".ASTROPHYSICAL JOURNAL 512.1(1999):L35-L38.
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