PROBING CURVATURE EFFECTS IN THE FERMI GRB 110920
PROBING CURVATURE EFFECTS IN THE FERMI GRB 110920
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DOI：
10.1088/0004-637x/778/1/3
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发表时间：
2013-04
期刊：
影响因子：
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通讯作者：
A. Shenoy;E. Sonbas;C. Dermer;L. Maximon;K. Dhuga;P. N. Bhat;J. Hakkila;W. Parke;G. MacLachlan-G.-MacLa
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作者：
A. Shenoy;E. Sonbas;C. Dermer;L. Maximon;K. Dhuga;P. N. Bhat;J. Hakkila;W. Parke;G. MacLachlan-G.-MacLa
伽马射线暴（GRBs）中的曲率效应长期以来一直是相当感兴趣的来源。在准直的相对论性伽马射线暴喷流中，相对于观测者的离轴光子到达的时间比轴上光子晚，并且在光谱上也更柔和。在这项工作中，我们对均匀喷射剖面调用了一个相对简单的运动学双壳碰撞模型，并将其预测与GRB快速发射数据进行了比较，这些数据归因于曲率效应，如峰-通量-峰-频率关系，即ν ν通量与光谱峰值之间的关系，GRB脉冲衰减阶段的Epk，以及光谱滞后。此外，我们还探讨了脉冲宽度随能量的变化规律。我们提出了单脉冲费米GRB 110920的情况，作为对模型与观测预测的测试。
Curvature effects in gamma-ray bursts (GRBs) have long been a source of considerable interest. In a collimated relativistic GRB jet, photons that are off-axis relative to the observer arrive at later times than on-axis photons and are also expected to be spectrally softer. In this work, we invoke a relatively simple kinematic two-shell collision model for a uniform jet profile and compare its predictions to GRB prompt-emission data for observations that have been attributed to curvature effects such as the peak-flux–peak-frequency relation, i.e., the relation between the νFν flux and the spectral peak, Epk in the decay phase of a GRB pulse, and spectral lags. In addition, we explore the behavior of pulse widths with energy. We present the case of the single-pulse Fermi GRB 110920 as a test for the predictions of the model against observations.