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arXiv 0907.3337astro-ph.IM
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硬X射线旋光仪(POLAR)预期性能的蒙特卡罗模拟

Expected performance of a hard X-ray polarimeter (POLAR) by Monte Carlo Simulation

Shaolin Xiong, Nicolas Produit, Bobing Wu

摘要:

对伽马射线暴(GRB)瞬发辐射的偏振测量可以为理解中心引擎的性质提供诊断信息。POLAR是一种小型偏振计,专门用于测量50-300 keV之间的伽玛暴的偏振,计划于2012年左右在中国空间实验室发射。在中国科学院高能物理研究所正在建造POLAR样机的同时,已经完成了初步的蒙特卡罗模拟,以达到预期的性能。计算了不同探测器配置和触发策略下的调制因子、效率和有效面积、背景速率和最小可探测偏振(MDP)。在优化的探测器结构和触发策略下,在总重量不超过30 kg的约束下,可以实现确定大多数伽玛暴是否为强极化伽玛暴的首要科学目标,在保守的探测器结构下,MDP < 10%的情况下,每年可以探测到约9个伽玛暴

英文摘要:

Polarization measurements of the prompt emission in Gamma-ray Bursts (GRBs) can provide diagnostic information for understanding the nature of the central engine. POLAR is a compact polarimeter dedicated to the polarization measurement of GRBs between 50-300 keV and is scheduled to be launched aboard the Chinese Space Laboratory about year 2012. A preliminary Monte Carlo simulation has been accomplished to attain the expected performance of POLAR, while a prototype of POLAR is being constructed at the Institute of High Energy Physics, Chinese Academy of Sciences. The modulation factor, efficiency and effective area, background rates and Minimum Detectable Polarization (MDP) were calculated for different detector configurations and trigger strategies. With the optimized detector configuration and trigger strategy and the constraint of total weight less than 30 kg, the primary science goal to determine whether most GRBs are strongly polarized can be achieved, and about 9 GRBs/yr can be detected with MDP < 10% for the conservative detector configuration

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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