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gamma暴
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  gamma-ray burst
     The widely accepted classification of gamma-ray bursts are classifying the gamma-ray bursts into two classes with T90, while few people think about the role of T50 which includes the duration of the dominant part of a gamma-ray burst when classifying.
     而对仅反映gamma射线暴主要爆发过程持续时间的T_(50)却很少有人问津。 而我们利用BATSE Current Catalog数据作了T_(50)分布图,利用其双峰分布,我们将gamma暴分为两类。
短句来源
     In the present thesis, it is introduced for the observed characters and physical processes of the gamma-ray burst. Then, the hydrodynamic evolution and synchrotron mechanism of fireball / blast wave model are discussed.
     本文首先对Gamma暴的观测特性和物理过程作了简要的介绍 ,而后 ,对火球模型的相对论流体动力学机制和同步加速辐射机制作了论述。
短句来源
     The hydrodynamic evolution of the fireball shell is comprehensively studied. Using the synchrotron mechanism and relativistic transformation from co-moving frame to lab frame, the light curves of the gamma-ray burst afterglow are obtained.
     主要工作是 :具体研究火球所抛出壳层的相对论流体动力学演化 ,应用同步加速辐射机制 ,通过由共动坐标系到实验室坐标系的相对论变换 ,得到Gamma暴余辉的光变曲线。
短句来源
     Through comparing these different light curves, the whole physical evolution of the gamma-ray burst afterglow and the various physical processes effecting on the evolution of the gamma-ray burst afterglow are presented.
     通过对这些不同的光变曲线的比较 ,明确了Gamma暴余辉的整体的物理演化图象以及各种物理过程在Gamma暴余辉演化过程中所起的作用 ,并从余辉演化的方面进一步理解了Gamma暴的物理本质
短句来源
  “gamma暴”译为未确定词的双语例句
     Hydrodynamic Evolution of GRB Afterglow and the Study of the Light Curves
     Gamma暴余辉的相对论流体动力学演化和光变曲线
短句来源
     In this work, we present the results of a statistical analysis to the distributions of the characteristics of the most intense pulses in GRBs detected by the Burst and Transient Source Experiment (BATSE) on board the Compton Gamma Ray Observatory (CGRO). These characteristics include pulse duration, amplitude, symmetry factor (δ, ratio of rising time to decaying time in a pulse),narrowness factor (η,FWHM to pulse duration).
     本文对康普顿γ射线天文台观测卫星上BATSE仪器观测到的γ暴的光变曲线的主峰数据进行统计分析,以研究gamma暴中脉冲的持续时间、振幅、对称因子(δ,上升时标比下降时标)、窄度因子(η,半宽度比持续时间)等特征参量的分布特征.
短句来源
  相似匹配句对
     The Light Curves and the Spectral Harness Ratios of Gamma-Ray Bursts
     Gamma射线的光变曲线和谱硬度比
短句来源
     Hydrodynamic Evolution of GRB Afterglow and the Study of the Light Curves
     Gamma余辉的相对论流体动力学演化和光变曲线
短句来源
     Solar Noise Storms
     太阳噪
短句来源
     Bootstraping Estimation of Parameters for Gamma Distribution
     Gamma分布的Bootstrap估计
短句来源
     On the Stability of Gamma Functional Equation
     Gamma函数方程的稳定性
短句来源
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  gamma-ray burst
A technique for the determination of cosmic gamma-ray burst coordinates by measuring the time lag between gamma-ray burst signals on different spacecraft in the near-Sun orbits is developed.
      
In the relativistic fireball model, the afterglow of a gamma-ray burst (GRB) is produced by synchrotron radiation of the electrons accelerated in the external shock that emerges as the relativistic flow moves.
      
Delay of emission from extragalactic gamma-ray burst sources as a test for selecting a model of the universe
      
We computed the thermal time-dependent X-ray spectrum of a hot plasma in the vicinity of a gamma-ray burst (GRB).
      
We performed accurate numerical calculations of angle-, time-, and frequency-dependent radiative transfer for the relativistic motion of matter in gamma-ray burst (GRB) models.
      
更多          
  gamma_ray burst
Accordingly to the scenario proposed in Astrophys.J.586(2003)1250, the energy released in this conversion can power a Gamma Ray Burst.
      
Possible experimental evidences, indicating a range of time delay between a Supernova explosion and a subsequent Gamma Ray Burst, are here discussed and interpreted.
      
An exact solution of the gamma ray burst arrival time analysis problem
      
A simple method of cross-correlating gamma ray burst time-histories is discussed.
      
Probing pseudo-Dirac neutrino through detection of neutrino-induced muons from gamma ray burst neutrinos
      
更多          


In the present thesis, it is introduced for the observed characters and physical processes of the gamma-ray burst. Then, the hydrodynamic evolution and synchrotron mechanism of fireball / blast wave model are discussed. The hydrodynamic evolution of the fireball shell is comprehensively studied. Using the synchrotron mechanism and relativistic transformation from co-moving frame to lab frame, the light curves of the gamma-ray burst afterglow are obtained. These light curves are different for various dynamic...

In the present thesis, it is introduced for the observed characters and physical processes of the gamma-ray burst. Then, the hydrodynamic evolution and synchrotron mechanism of fireball / blast wave model are discussed. The hydrodynamic evolution of the fireball shell is comprehensively studied. Using the synchrotron mechanism and relativistic transformation from co-moving frame to lab frame, the light curves of the gamma-ray burst afterglow are obtained. These light curves are different for various dynamic evolution of the shell, isotropic or anisotropic cases and various environment of the media. Through comparing these different light curves, the whole physical evolution of the gamma-ray burst afterglow and the various physical processes effecting on the evolution of the gamma-ray burst afterglow are presented.

本文首先对Gamma暴的观测特性和物理过程作了简要的介绍 ,而后 ,对火球模型的相对论流体动力学机制和同步加速辐射机制作了论述。主要工作是 :具体研究火球所抛出壳层的相对论流体动力学演化 ,应用同步加速辐射机制 ,通过由共动坐标系到实验室坐标系的相对论变换 ,得到Gamma暴余辉的光变曲线。对于火球壳层的不同的动力学演化规律 ,各向同性或各向异性的壳层抛出形式 ,以及不同的外部介质环境 ,所得到的光变曲线都各不相同。通过对这些不同的光变曲线的比较 ,明确了Gamma暴余辉的整体的物理演化图象以及各种物理过程在Gamma暴余辉演化过程中所起的作用 ,并从余辉演化的方面进一步理解了Gamma暴的物理本质

It is believed that the light curves of gamma-ray bursts (GRBs) are composed of a series of pulses. The light curves of most intense pulse, which correspond to the most violent outburst in a burst, might have the best ratio of signal-to-noise. Thus, they are the best candidates to study the characteristics of the pulses. In this work, we present the results of a statistical analysis to the distributions of the characteristics of the most intense pulses in GRBs detected by the Burst and Transient Source Experiment...

It is believed that the light curves of gamma-ray bursts (GRBs) are composed of a series of pulses. The light curves of most intense pulse, which correspond to the most violent outburst in a burst, might have the best ratio of signal-to-noise. Thus, they are the best candidates to study the characteristics of the pulses. In this work, we present the results of a statistical analysis to the distributions of the characteristics of the most intense pulses in GRBs detected by the Burst and Transient Source Experiment (BATSE) on board the Compton Gamma Ray Observatory (CGRO). These characteristics include pulse duration, amplitude, symmetry factor (δ, ratio of rising time to decaying time in a pulse),narrowness factor (η,FWHM to pulse duration). Our results show that the pulse durations range in 0.1-0.2 seconds with slight shorter in channels 1 and 4 (especial channel 4) than that in other channels. The distribution of pulse amplitudes is very scatter with a mode of 600 photons per second in four channels and a relative median of 0.44:0.59:1.00:0.32. The shapes of the pulses are asymmetric with a slight difference in channels 1, 2, 3 . The distributions of δ and η in different channels are almost the same, which are clustered at 0.75 -0.85 and 0.55-0.58 (the mean is 0.52±0.10) forδ and η, respectively.

γ暴被认为由一系列脉冲所组成,其光变曲线中的峰对应着脉冲爆发过程,主峰对应着最强烈的脉冲爆发过程,所受背景噪音的污染相对来说最小.因此光变曲线的主峰最适合于用以研究脉冲特性.本文对康普顿γ射线天文台观测卫星上BATSE仪器观测到的γ暴的光变曲线的主峰数据进行统计分析,以研究gamma暴中脉冲的持续时间、振幅、对称因子(δ,上升时标比下降时标)、窄度因子(η,半宽度比持续时间)等特征参量的分布特征.我们发现:(1)脉冲的持续时间主要在0.1s~0.2s之间,第1和第4能道的持续时间略短,尤其是第4能道.(2)1~4道振幅分布差异比较大,虽然众数都大约在600个计数/s附近,但中值差异很大,1~4道中值比为:0.44:0.59:1.00:0.32.(3)1~4道脉冲的形状都是不对称的,峰的形状差异不是很大,1、2、3道间差异最小,4道略尖锐.两个主要形状参数δ和η在不同能道间的差异不大.1~4道的δ值最可几值一般在0.75~0.85间.η在0.55~0.58间,平均值为0.52±0.10.

 
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