X-Ray Spectroscopy of Galactic Hot Gas along the PKS 2155$-$304 Sight Line
X-Ray Spectroscopy of Galactic Hot Gas along the PKS 2155$-$304 Sight Line
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DOI：
10.1093/pasj/62.3.723
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发表时间：
2010-06
影响因子：
2.3
通讯作者：
T. Hagihara;Yangsen Yao;N. Yamasaki;K. Mitsuda;Q. Wang;Y. Takei;T. Yoshino;D. McCammon
中科院分区：
文献类型：
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作者：
T. Hagihara;Yangsen Yao;N. Yamasaki;K. Mitsuda;Q. Wang;Y. Takei;T. Yoshino;D. McCammon
我们提出了一个详细的光谱研究的银河系晕的热气体的方向上的开拓者PKS 2155-304（z=0.117）。OVII和OVIII吸收线是用Chandra上的低能和高能透射光栅摄谱仪测量的，而OVII，OVIII和NeIX发射线是用朱雀号上的X射线成像光谱仪观测的，它们产生于PKS 2155-304方向的邻近场。假设垂直指数分布的气体的温度和密度，我们进行了综合分析的吸收和发射数据。在银道面上的气体温度和密度被确定为2.5（+0.6，-0.3）MK和1.4（+0.5，-0.4）x 10^{-3} cm^{-3}，气体温度和密度的标度高度分别为5.6（+7.4，-4.2）kpc和2.3（+0.9，-0.8）kpc。这些值与在LMC X-3方向上获得的值一致。
We present a detailed spectroscopic study of the hot gas in the Galactic halo toward the direction of a blazer PKS 2155-304 (z=0.117). The OVII and OVIII absorption lines are measured with the Low and High Energy Transmission Grating Spectrographs aboard Chandra, and the OVII, OVIII, and NeIX emission lines produced in the adjacent field of the PKS 2155-304 direction are observed with the X-ray Imaging Spectrometer aboard Suzaku. Assuming vertically exponential distributions of the gas temperature and the density, we perform a combined analysis of the absorption and emission data. The gas temperature and density at the Galactic plane are determined to be 2.5(+0.6,-0.3) MK and 1.4(+0.5,-0.4) x 10^{-3} cm^{-3} and the scale heights of the gas temperature and density are 5.6(+7.4,-4.2) kpc and 2.3(+0.9,-0.8) kpc, respectively. These values are consistent with those obtained in the LMC X-3 direction.