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arXiv 1207.7352astro-ph.HE
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利用朱雀观测仪对CTA 1的研究

Investigation of CTA 1 with Suzaku Observation

Lupin C. C. Lin, Jumpei Takata, Albert K. H. Kong, C. Y. Hui, Teruaki Enoto, H. K. Chang, Regina H. H. Huang, J. S. Liang, Shinpei Shibata, C. Y. Hwang

摘要:

我们报道了超新星遗迹CTA 1(G119.5+10.2)的105 kS朱雀观测。采用定时模式和成像模式对朱雀星进行了软X射线观测。在这次深空观测中,首次发现了脉冲星风星云(PWN)的一个~ 10'扩展特征,它被解释为一个弓形激波成分。星云的光谱可以用幂律来模拟,光子指数约为1.8,这表明了一个缓慢的同步加速器冷却方案。光子指数在该扩展特征上近似恒定。我们比较和讨论我们的观察这个复杂的星云与以前的X射线调查。在软(0.2-12 keV)和硬(10-60 keV)X射线数据中,我们没有从中央脉冲星获得任何明显的脉动。无法探测主要是由于失去了精确成像能力,无法准确确定震源贡献。根据我们的分析,XIS和HXD的光谱可以直接连接而没有显著的光谱中断。NuSTAR和Astro-H的未来观测将能够解决污染问题,并提供CTA 1的精确硬X射线测量。

英文摘要:

We report on an 105 ks Suzaku observation of the supernova remnant CTA 1 (G119.5+10.2). The Suzaku soft X-ray observation was carried out with both timing mode and imaging mode. A ~ 10' extended feature, which is interpreted as a bow-shock component of the pulsar wind nebula (PWN), is revealed in this deep observation for the first time. The nebular spectrum can be modelled by a power-law with a photon index of ~ 1.8 which suggests a slow synchrotron cooling scenario. The photon index is approximately constant across this extended feature. We compare and discuss our observations of this complex nebula with previous X-ray investigations. We do not obtain any significant pulsation from the central pulsar in the soft (0.2-12 keV) and hard (10-60 keV) X-ray data. The non-detection is mainly due to the loss of the precise imaging ability to accurately determine the source contribution. The spectra of XIS and HXD can be directly connected without a significant spectral break according to our analysis. Future observations of NuSTAR and Astro-H would be able to resolve the contamination and provide an accurate hard X-ray measurement of CTA 1.

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