伽玛射线暴内光度和峰值能量关系的再研究

A Revisit of the Luminosity-Ep relation of Gamma-Ray Bursts

使用了185个伽玛射线暴(简称伽玛暴)的5 218个时间分辨谱数据,重新研究了伽玛暴内光度和峰值能量的关系及该关系对火球模型的限制。研究结果表明:(1)不管是在伽玛暴内还是在伽玛暴间各向同性等值光度Liso和静止系中vFv谱的峰值能量E'p之间关系式Liso∝E'p2都存在;(2)不管是动能主导的内激波模型还是磁耗散主导的外激波模型都能很好地解释关系式Liso∝E'p2及ω的值。这些结论与Liang等人的结论是一致的。

Using 5218 time-resolved spectra for 185 Gamma-Ray Bursts （GRBs） we revise the relation between isotropic-equivalent luminosities （ Liso ） and peak energies （ E＇p ） of the vFv spectra in the rest frames of GRBs. We discuss possible implications of this relation for the fireball models. Our studies show that （ 1 ） the relation Liso ∝ E＇2 holds for GRBs individually and collectively, and （2） both the kinetic-energy dominated internal shock model and the magnetic-dissipation dominated external shock model can well interpret the Liso ∝E＇2 and the value of ω. It is found that our results are in good agreement with those of Liang et al. 2004. P