A Suzaku Observation of the Low-Mass X-Ray Binary GS 1826-238 in the Hard State
A Suzaku Observation of the Low-Mass X-Ray Binary GS 1826-238 in the Hard State
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DOI：
10.1093/pasj/psw003
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发表时间：
2016-01
期刊：
影响因子：
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通讯作者：
Ko Ono;Soki Sakurai;Zhongli Zhang;K. Nakazawa;K. Makishima
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文献类型：
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作者：
Ko Ono;Soki Sakurai;Zhongli Zhang;K. Nakazawa;K. Makishima
中子星星低质量X射线双星GS 1826 - 238在2009年10月21日被朱雀观测到，总曝光量为103千秒。除I型爆发外，源强度恒定在~10%以内。结合朱雀XIS、HXD-PIN和HXD-GSO的数据，在0.8 - 100 keV范围内检测到猝发消除的持续发射，未吸收通量为2.6e-9 erg/s/cm/cm。虽然0.8 - 100 keV的亮度，1.5e37 erg/s（假设距离为7 kpc）相对较高，但观测到的硬光谱证实了源处于硬态。该光谱成功地解释了从一个软标准吸积盘部分康普顿热电子云的发射。这些结果与之前的研究结果进行了比较，包括Thompson et al.（2005）和Cocchi et al.（2011）对同一来源的研究结果，以及使用Suzaku获得的Aql X-1硬态研究结果（Sakurai et al. 2014）。
The neutron star Low-Mass X-ray Binary GS 1826-238 was observed with Suzaku on 2009 October 21, for a total exposure of 103 ksec. Except for the type I bursts, the source intensity was constant to within ~10%. Combining the Suzaku XIS, HXD-PIN and HXD-GSO data, burst-removed persistent emission was detected over the 0.8-100 keV range, at an unabsorbed flux of 2.6e-9 erg/s/cm/cm. Although the implied 0.8-100 keV luminosity, 1.5e37 erg/s (assuming a distance of 7 kpc), is relatively high, the observed hard spectrum confirms that the source was in the hard state. The spectrum was successfully explained with an emission from a soft standard accretion disk partially Comptonized by a hot electron cloud. These results are compared with those from previous studies, including those on the same source by Thompson et al. (2005) and Cocchi et al. (2011), as well as that of Aql X-1 in the hard state obtained with Suzaku (Sakurai et al. 2014).