Diffuse Hard X-Ray Sources Discovered with the ASCA Galactic Plane Survey
Diffuse Hard X-Ray Sources Discovered with the ASCA Galactic Plane Survey
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DOI：
10.1086/374354
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发表时间：
2003-01
期刊：
影响因子：
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通讯作者：
A. Bamba;M. Ueno;K. Koyama;S. Yamauchi
中科院分区：
文献类型：
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作者：
A. Bamba;M. Ueno;K. Koyama;S. Yamauchi
我们在ASCA银面巡天数据中发现了漫射硬x射线源G11.0+0.0、G25.5+0.0和G26.6-0.1。x射线谱无特征，无发射谱线，具有非平衡电离薄热等离子体模型和幂律函数模型。在视距平均密度为1 H cm-3的假设下，利用最拟合的NH值估计源距离为1-8 kpc。光源尺寸和光度分别为4.5- 27pc和（0.8-23）× 1033 ergs s-1。虽然源大小是典型的年轻到中等年龄的超新星遗迹（SNR），但光谱中的x射线亮度，等离子体温度和弱发射线都是不寻常的。这表明这些天体要么是由x射线同步辐射主导的壳状信噪比，如SN 1006，要么是复离子型信噪比。我们还估计了银河系中这类信噪比的总数。
We found diffuse hard X-ray sources G11.0+0.0, G25.5+0.0, and G26.6-0.1 in the ASCA Galactic plane survey data. The X-ray spectra are featureless with no emission line and are fitted with both models of a thin thermal plasma in nonequilibrium ionization and a power-law function. The source distances are estimated to be 1-8 kpc, using the best-fit NH values under the assumption that the mean density in the line of sight is 1 H cm-3. The source sizes and luminosities are then 4.5-27 pc and (0.8-23) × 1033 ergs s-1. Although the source sizes are typical for supernova remnants (SNR) with young-to-intermediate ages, the X-ray luminosity, plasma temperature, and weak emission lines in the spectra are all unusual. This suggests that these objects are either shell-like SNRs dominated by X-ray synchrotron emission, like SN 1006 or, alternatively, plerionic SNRs. The total number of these classes of SNRs in our Galaxy is also estimated.