3类珈玛射线暴的谱硬率研究

The Spectral Hardness Ratio of Three Classes of Gamma-Ray Bursts

珈玛射线暴是目前人类发现的宇宙中能量最高的天文现象,通常认为它可以分为2类.Mukherjee(1998)和Horvath(1999)运用不同的方法,分别独立地得到了可能存在第3类暴的结论,提出珈玛射线暴可以分为3类.根据珈玛射线暴的这一新的分类,人们希望了解第3类暴的性质及与其它类的区别.本文计算了这3类暴的谱硬率,给出了它们的谱硬率分布图和相关系数,并对其进行讨论.新的第3类暴产生的物理机制可能不同于另外的2类暴.

Gamma-ray burst is the highest energy phenomena found by people in cosmos so far. According to observatory, it can be divided into two classes. Mukherjee（ 1998）and Horvath （1999） respectively used different methods to reach the conclusion that gamma-ray bursts would be divided into three classes. People want to know the nature of the third class in the new classification of gamma-ray bursts and the difference from the other ones. The spectral hardness ratio of three classes is calculated and discussed. The physical mechanisms of the new third may be different from others.