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arXiv 1209.4119astro-ph.HE
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4U 1909+07与朱雀

Staring at 4U 1909+07 with Suzaku

F. Fuerst, K. Pottschmidt, I. Kreykenbohm, S. Mueller, M. Kuehnel, J. Wilms, R. E. Rothshild

摘要:

利用朱雀星资料对中子星高质量X射线双星4U 1909+07进行了分析。我们延长了脉冲周期的演变,这表现在一个随机行走的方式,直接风吸积的指示。研究4U 1909+07在0.5至90 keV之间的光谱特性,我们发现,当另外考虑低能量的黑体或部分覆盖吸收体时,具有指数截止的幂律可以很好地描述数据。我们没有发现回旋共振散射特征(CRSF)的证据,这是在许多其他中子星HMXB源中看到的特征。通过执行脉冲相位分辨光谱,我们调查的起源强的能量依赖的脉冲轮廓,它从一个广泛的两个峰值的轮廓在低能量演变为一个单一的,窄峰的能量高于20千电子伏的轮廓。我们的数据表明,这是很可能的,在高能量峰较高的折叠能量是负责这种行为。这反过来又导致了这样的假设,即我们观察到两个磁极和它们各自的吸积柱处于不同的相位,并且这些吸积柱具有略微不同的物理条件。

英文摘要:

We present an analysis of the neutron star High Mass X-ray Binary (HMXB) 4U 1909+07 mainly based on Suzaku data. We extend the pulse period evolution, which behaves in a random-walk like manner, indicative of direct wind accretion. Studying the spectral properties of 4U 1909+07 between 0.5 to 90 keV we find that a power-law with an exponential cutoff can describe the data well, when additionally allowing for a blackbody or a partially covering absorber at low energies. We find no evidence for a cyclotron resonant scattering feature (CRSF), a feature seen in many other neutron star HMXBs sources. By performing pulse phase resolved spectroscopy we investigate the origin of the strong energy dependence of the pulse profile, which evolves from a broad two-peak profile at low energies to a profile with a single, narrow peak at energies above 20 keV. Our data show that it is very likely that a higher folding energy in the high energy peak is responsible for this behavior. This in turn leads to the assumption that we observe the two magnetic poles and their respective accretion columns at different phases, and that these accretions column have slightly different physical conditions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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