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arXiv 0809.1278astro-ph
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用Suzaku研究AX J1745 .6-2901的定时和光谱

Timing and Spectral Study of AX J1745.6-2901 with Suzaku

Yoshiaki Hyodo, Yoshihiro Ueda, Takayuki Yuasa, Yoshitomo Maeda, Kazuo Makishima, Katsuji Koyama

摘要:

在爆发阶段,朱雀观测到了食的低质量X射线双星AX J1745.6-2901。结合比朱雀星早1.5个月的钱德拉观测,我们确定其轨道周期为30063.76 ± 0.14 s。我们发现在轨道的日食阶段之前有很深的通量下降。的X射线光谱的持久阶段描述的直接和散射的尘埃排放的组合。在日食期间,X射线光谱变成只有尘埃散射(散射)成分。尘埃散射的光学深度在1 keV时约为10.5。直接分量由可能来自中子星表面的黑体和盘状黑体组成。没有幂律分量被发现在硬能带高达30千电子伏。在深浸光谱中~ 7.1keV处的清晰边缘表明吸收体中的Fe的主要部分是中性的或处于低电离态。我们发现了四个窄的吸收线附近的K-壳层跃迁能的Fe XXV,Fe XXVI,和Ni XXVII。吸收线的特征很好地解释了太阳丰度气体在~10^3 km/s的整体运动。

英文摘要:

The eclipsing low-mass X-ray binary AX J1745.6-2901 was observed with Suzaku in its outburst phase. Combining the Chandra observation made 1.5 month earlier than Suzaku, we determined the orbital period to be 30063.76+/-0.14 s. We found deep flux dips prior to the eclipse phase of orbit. The X-ray spectrum of the persistent phase is described with a combination of a direct and a scattered-in by dust emissions. During the eclipse, the X-ray spectrum becomes only the dust scattering (scattered-in) component. The optical depth of the dust-scattering is ~10.5 at 1 keV. The direct component is composed of a blackbody likely from the neutron star surface and a disk-blackbody. No power-law component is found in the hard energy band up to 30 keV. A clear edge at ~7.1 keV in the deep dip spectrum indicates that the major portion of Fe in the absorber is neutral or at low ionization state. We discovered four narrow absorption lines near the K-shell transition energies of Fe XXV, Fe XXVI, and Ni XXVII. The absorption line features are well explained by the solar abundance gas in a bulk motion of ~10^3 km/s.

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