摘要
Cyg X-1高能辐射的时变特征可以通过短暴(shot)的性质反映.因此Cyg X-1的短暴性质,特别是处于低态时的性质曾被广泛研究.利用直接叠加短暴和自相关函数,对Cyg X-1高态时短暴的性质进行了研究.结果表明,当Cyg X-1处于高态时,其短暴的结构类似于低态时所具有的性质,短暴的半高宽随能量的增加按指数下降.此结果和康普顿化模型不一致.另外,短暴的能谱演化及结构的非对称性可以解释Cyg X-1中的时延现象.
The X-ray temporal variability of light curves of Cyg X-1 can be represented by the properties of shot. The properties of shot of Cyg X-1 were studied widely, especially when Cyg X-1 was in its typical state, namely low state/ hard state. In this paper the direct superposing position method of shots and the autocorrelation function are employed to study the properties of shot when Cyg X-1 was in its soft high state/ soft state, The results show that the full widths at half maximum (FWHM) of shots decrease with increasing energy. This is not consistent with the prediction of Comptonization models. The evolution of energy spectra and asymmetric structures of shots may explain the time lag observed in Cyg X-1.
出处
《天文学报》
CSCD
北大核心
2004年第4期356-360,共5页
Acta Astronomica Sinica
基金
国家重点基础研究专项经费国家科学基金资助项目(10273010)
