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arXiv 0907.0626astro-ph.IM
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费米大面积望远镜的发射后性能

Post-launch performance of the Fermi Large Area Telescope

R. Rando

摘要:

费米伽马射线太空望远镜上的大面积望远镜(LAT)在经过大约60天的仪器检查和调试后于2008年8月13日开始正常运行,目前正在进行从30 MeV到300 GeV以上的全天伽马射线调查,具有前所未有的灵敏度和角分辨率。使用蒙特卡罗模拟和试验射束数据对LAT发射前响应进行了调整,这些数据来自范围必然有限的活动。这表明,在处理系统分类时采取了保守的方法,这会影响到采集数据头几个月的重建分析。目前正在完成根据飞行数据对仪器性能进行的第一次重大更新。不仅LAT校准现在基于飞行数据,而且地面事件重建也已更新,以适应在轨校准,并使用来自天体来源的真实数据仔细验证响应。在这篇文章中,我们描述了目前对该工具的最佳了解,以及我们计划在第2年发布公共响应函数以支持数据发布。

英文摘要:

The Large Area Telescope (LAT) on-board the Fermi Gamma-ray Space Telescope started nominal operations on August 13, 2008, after about 60 days of instrument checkout and commissioning and is currently performing an all-sky gamma-ray survey from 30 MeV to above 300 GeV with unprecedented sensitivity and angular resolution. The LAT pre-launch response was tuned using Monte Carlo simulations and test beam data from a campaign necessarily limited in scope. This suggested a conservative approach in dealing with systematics that affect the reconstruction analysis of the first months of data taking. The first major update of the instrument performance based on flight data is now being completed. Not only are the LAT calibrations now based on flight data, but also the ground event reconstruction has been updated to accommodate on-orbit calibrations, and response was carefully verified using real data from celestial sources. In this contribution we describe the current best knowledge of the instrument, and our plans towards releasing public response functions to support data release in year 2.

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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