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arXiv 1608.04992astro-ph.IMastro-ph.HE
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切伦科夫望远镜阵列现场积分灵敏度:观测螃蟹

The Cherenkov Telescope Array On-Site integral sensitivity: observing the Crab

Valentina Fioretti, Andrea Bulgarelli, Fabian Schussler

摘要:

切伦科夫望远镜阵列(CTA)是未来在甚高能(VHE)领域的大型天文台。它的工作能量在20 GeV到300 TeV之间,将由数十个成像空气切伦科夫望远镜(IACT)组成,分布在南半球和北半球几平方公里的大面积上。CTA/DATA On-Site Analysis(OSA)是一个专门开发专用管道和算法的系统,用于CTA现场重建、数据质量监测、科学监测和观测期间的实时科学警报。OSA积分灵敏度计算在这里的最研究的源在伽马射线,蟹状星云,为一组曝光范围从1000秒到50小时,使用完整的CTA南方阵列。选择蟹状星云作为OSA积分灵敏度的第一个例子的原因有两个:(i)这个源的特点是具有覆盖整个CTA能量范围的宽光谱;(ii)在撰写本文时,它代表VHE中的标准烛光,并且它经常被用作IACT灵敏度的单位。评估了不同蟹状星云发射模型对CTA积分灵敏度的影响,以强调在OSA用例评估中需要CTA科学目标的代表性光谱。使用最完整的模型作为输入的OSA积分灵敏度,我们得到一个显着的检测蟹状星云(约10%的流量),即使是1000秒的曝光,能量阈值小于10 TeV。

英文摘要:

The Cherenkov Telescope Array (CTA) is the future large observatory in the very high energy (VHE) domain. Operating from 20 GeV to 300 TeV, it will be composed of tens of Imaging Air Cherenkov Telescopes (IACTs) displaced in a large area of a few square kilometers in both the southern and northern hemispheres. The CTA/DATA On-Site Analysis (OSA) is the system devoted to the development of dedicated pipelines and algorithms to be used at the CTA site for the reconstruction, data quality monitoring, science monitoring and realtime science alerting during observations. The OSA integral sensitivity is computed here for the most studied source at Gamma-rays, the Crab Nebula, for a set of exposures ranging from 1000 seconds to 50 hours, using the full CTA Southern array. The reason for the Crab Nebula selection as the first example of OSA integral sensitivity is twofold: (i) this source is characterized by a broad spectrum covering the entire CTA energy range; (ii) it represents, at the time of writing, the standard candle in VHE and it is often used as unit for the IACTs sensitivity. The effect of different Crab Nebula emission models on the CTA integral sensitivity is evaluated, to emphasize the need for representative spectra of the CTA science targets in the evaluation of the OSA use cases. Using the most complete model as input to the OSA integral sensitivity, we obtain a significant detection of the Crab nebula (about 10% of flux) even for a 1000 second exposure, for an energy threshold less than 10 TeV.

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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