伽玛暴的光谱与超相对论性膨胀壳层初始能量分布的关系

Q4 Medicine
I. Siutsou, A. E. Kurhuzava
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引用次数: 0

摘要

伽玛射线暴的初始阶段可以用辐射在壳层中的扩散来描述,壳层在超相对论性上扩大。本文考虑了壳内初始能量分布随深度呈线性变化的情况。同时,初始能量分布函数的斜率决定了伽马暴在初始时间时刻的有效温度和瞬时谱,以及高频处的时间积分谱。此外,我们还研究了伽马射线暴的瞬时谱与到达时间的关系:如果它增加,则在较小的频率上观察到最大通量,而与壳层中的初始能量分布无关。当到达时间大于1s时,瞬时谱与壳层初始能量分布无关。对于壳层内的任何初始能量分布,时间积分谱的幂律部分在较低频率处的斜率是相同的,等于1.98;在较高频率下,随着初始时刻壳内能量分布对应函数斜率的增大,其斜率逐渐增大,其值在-2.38 ~ -13.73之间。这使我们能够借助我们的模型来解释具有典型波段谱的大量伽马射线暴。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dependence of the spectra of gamma-ray bursts on the initial energy distribution in the ultrarelativistically expanding shell
The initial stage of a gamma-ray burst can be described by the diffusion of radiation in the shell which is ultrarelativistically widening. We have herein considered the case when the initial energy distribution in the shell depends on the depth according to a linear law. At the same time, the slope of the initial energy distribution function determines the effective temperature and the instantaneous spectrum of the gamma-ray burst at the initial time moment, as well as the time-integrated spectrum at high frequencies. Moreover, we investigated the dependence of the instantaneous spectrum of the gamma-ray burst on the time of arrival: if it increases, the flux maximum is observed for a smaller frequency independently of the initial energy distribution in the shell. It the time of arrival is larger than 1 s, the instantaneous spectrum is independent of the initial energy distribution in the shell. The slope of the power-law part of the time-integrated spectrum at lower frequencies is the same for any initial energy distribution in the shell and it is equal to 1.98; at higher frequencies, it becomes steeper with increasing the slope of the function corresponding to the energy distribution in the shell at the initial instant of time, and it has values between –2.38 and –13.73.This allows us to explain with the help of our model a large number of gamma-ray bursts that have a typical Band spectrum.
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来源期刊
CiteScore
0.40
自引率
0.00%
发文量
35
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