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arXiv 1005.3498astro-ph.HE
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使用XMM-牛顿数据的XB 1323-619的频率分辨光谱:盘中反射区的检测

Frequency Resolved Spectroscopy of XB 1323-619 Using XMM-Newton data: Detection of a Reflection Region in the Disk

S. Balman

摘要:

利用XMM-牛顿观测资料,给出了低质量X射线双星双星XB 1323-619在持续发射过程中4个不同频段的频率分辨能谱。FRS方法有助于探测吸积盘的内部区域。我们发现,FRS是很好地描述了一个单一的黑体组件与kT在1.0-1.4 keV的范围内负责源的频率范围0.002-0.04 Hz,和0.07-0.3 Hz的变化。我们把这一部分归因于吸积盘,并可能从现有的边界层辐射压力支持的排放。黑体分量在较低频率范围内的出现和向较高频率的消失表明它也可能是盘黑体发射。我们检测到一种不同形式的FRS的较高的频率范围0.9-6 Hz和8-30 Hz,这是最好的建模与幂律和高斯发射线在6.4 $^{+0.2}_{-0.3}$ keV的等效宽度为1.6 $^{+0.4}_{-1.2}$ keV和1.3 $^{+0.7}_{-0.9}$ keV的两个频率范围,分别。在光谱的较高频率范围内检测到的这种铁荧光线表明在该系统中在内部盘区域内存在反射。此外,我们发现0.9-6 Hz频段在1.4 $^{+1.0}_{-0.2}$ Hz和2.8 $^{+0.2}_{-0.2}$ Hz处显示出两个QPO峰,置信水平约为2.8-3.1 $σ$。这些与之前从该来源检测到的$\sim$ 1 Hz QPO一致(Jonker等人,1999)。我们认为它们与反射现象有关。从反射区的发射,是一个可变的光谱分量在这个系统中,源自内部区域的磁盘与最大尺寸为4.7 $\times 10^9$厘米和最小尺寸为1.6 $\times 10^8$厘米计算使用光的旅行时间的考虑和我们的频率分辨光谱。

英文摘要:

We present the frequency resolved energy spectra (FRS) of the low-mass X-ray binary dipper XB 1323-619 during persistent emission in four different frequency bands using an archival XMM-Newton observation. FRS method helps to probe the inner zones of an accretion disk. We find that the FRS is well described by a single blackbody component with kT in a range 1.0-1.4 keV responsible for the source variability in the frequency ranges 0.002-0.04 Hz, and 0.07-0.3 Hz. We attribute this component to the accretion disk and possibly emission from an existing boundary layer supported by radiation pressure. The appearance of the blackbody component in the lower frequency ranges and disappearance towards the higher frequencies suggests that it may also be a disk-blackbody emission. We detect a different form of FRS for the higher frequency ranges 0.9-6 Hz and 8-30 Hz which is modeled best with a power-law and a Gaussian emission line at 6.4$^{+0.2}_{-0.3}$ keV with an equivalent width of 1.6$^{+0.4}_{-1.2}$ keV and 1.3$^{+0.7}_{-0.9}$ keV for the two frequency ranges, respectively. This iron fluorescence line detected in the higher frequency ranges of spectra shows the existence of reflection in this system within the inner disk regions. In addition, we find that the 0.9-6 Hz frequency band shows two QPO peaks at 1.4$^{+1.0}_{-0.2}$ Hz and 2.8$^{+0.2}_{-0.2}$ Hz at about 2.8-3.1 $σ$ confidence level. These are consistent with the previously detected $\sim$ 1 Hz QPO from this source (Jonker et al. 1999). We believe they relate to the reflection phenomenon. The emission from the reflection region, being a variable spectral component in this system, originates from the inner regions of the disk with a maximum size of 4.7$\times 10^9$ cm and a minimum size of 1.6$\times 10^8$ cm calculated using light travel time considerations and our frequency resolved spectra.

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