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arXiv 0710.4280astro-ph
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早期宇宙的伽马射线暴:对现在和未来仪器的预测

Gamma Ray Bursts from the early Universe: predictions for present-day and future instruments

R. Salvaterra, S. Campana, G. Chincarini, S. Covino, G. Tagliaferri

摘要:

长伽马射线暴(GRB)是研究宇宙再电离前后的重要工具。我们在这里描述了一个“理想”的仪器,在z>6-10的伽玛暴搜索的特点。我们发现,这些对象的检测需要具有高灵敏度和适度大FOV的软带探测器。根据这些结果,我们比较了现有的和计划中的伽玛暴任务,得出保守的预测,这些仪器可检测到的高Z伽玛暴的数量以及最大可访问的红移。我们表明,雨燕卫星将能够检测到各种伽玛暴在z>6,并可能在z>10,如果触发阈值降低了一个因素~2。此外,我们发现INTEGRAL和GLAST不是检测z>6处爆发的最佳工具:前者受到小FOV的限制,后者受到硬能带和相对较低灵敏度的限制。最后,未来的任务(SVOM,EDGE,但特别是EXIST)将在几年的运行中提供z>6的伽玛暴的良好样本。

英文摘要:

Long Gamma Ray Bursts (GRBs) constitute an important tool to study the Universe near and beyond the epoch of reionization. We delineate here the characteristics of an 'ideal' instrument for the search of GRBs at z>6-10. We find that the detection of these objects requires soft band detectors with a high sensitivity and moderately large FOV. In the light of these results, we compare available and planned GRB missions, deriving conservative predictions on the number of high-z GRBs detectable by these instruments along with the maximum accessible redshift. We show that the Swift satellite will be able to detect various GRBs at z>6, and likely at z>10 if the trigger threshold is decreased by a factor of ~2. Furthermore, we find that INTEGRAL and GLAST are not the best tool to detect bursts at z>6: the former being limited by the small FOV, and the latter by its hard energy band and relatively low sensitivity. Finally, future missions (SVOM, EDGE, but in particular EXIST) will provide a good sample of GRBs at z>6 in a few years of operation.

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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