FIREBALL-2：暗星系际介质红移发射气球望远镜
FIREBall-2: The Faint Intergalactic Medium Redshifted Emission Balloon Telescope
摘要：
暗星系际介质红移发射气球（FIREBall）是一项旨在首次观测中等红移（z~0.7）星系环星系介质微弱发射的飞行任务。FIREBall观察到星系的一个组成部分，它在星系的形成和演化中起着关键作用，可能包含大量的重子，并且直到最近才在可见光的更高红移处被观察到。在这里，我们报告了2018年9月22日从新墨西哥州萨姆纳堡进行的FIREBall-2气球望远镜的飞行。这次飞行是光谱仪从最初的FIREBall光纤馈电IFU到宽视场多目标光谱仪的完全重新设计的高潮。由于气球上的一个洞，飞行提前终止，我们最初的科学目标没有实现。仪器和望远镜的总灵敏度为90，000 LU，主要是由于杂散光的噪音增加。我们讨论了FIREBall-2摄谱仪的设计，从原来的FIREBall有效载荷的修改，并提供了所有系统的性能的概述。我们能够成功地飞行测试一个新的指向控制系统，一个紫外线优化，δ掺杂和涂层EMCCD，和一个非球面光栅。FIREBall-2团队正在重建有效载荷，以便在2021年秋季进行另一次飞行尝试，由于COVID-19而从2020年推迟。
英文摘要：
The Faint Intergalactic Medium Redshifted Emission Balloon (FIREBall) is a mission designed to observe faint emission from the circumgalactic medium of moderate redshift (z~0.7) galaxies for the first time. FIREBall observes a component of galaxies that plays a key role in how galaxies form and evolve, likely contains a significant amount of baryons, and has only recently been observed at higher redshifts in the visible. Here we report on the 2018 flight of the FIREBall-2 Balloon telescope, which occurred on September 22nd, 2018 from Fort Sumner, New Mexico. The flight was the culmination of a complete redesign of the spectrograph from the original FIREBall fiber-fed IFU to a wide-field multi-object spectrograph. The flight was terminated early due to a hole in the balloon, and our original science objectives were not achieved. The overall sensitivity of the instrument and telescope was 90,000 LU, due primarily to increased noise from stray light. We discuss the design of the FIREBall-2 spectrograph, modifications from the original FIREBall payload, and provide an overview of the performance of all systems. We were able to successfully flight test a new pointing control system, a UV-optimized, delta-doped and coated EMCCD, and an aspheric grating. The FIREBall-2 team is rebuilding the payload for another flight attempt in the Fall of 2021, delayed from 2020 due to COVID-19.
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