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FIREBall-2: flight preparation of a proven balloon payload to image the intermediate redshift circumgalactic medium
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FIREBall-2: flight preparation of a proven balloon payload to image the intermediate redshift circumgalactic medium
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FIREBall-2: flight preparation of a proven balloon payload to image the intermediate redshift circumgalactic medium
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Paper
FIREBall-2: flight preparation of a proven balloon payload to image the intermediate redshift circumgalactic medium
2022
Overview
FIREBall-2 is a stratospheric balloon-borne 1-m telescope coupled to a UV multi-object slit spectrograph designed to map the faint UV emission surrounding z~0.7 galaxies and quasars through their Lyman-alpha line emission. This spectro-imager had its first launch on September 22nd 2018 out of Ft. Sumner, NM, USA. Because the balloon was punctured, the flight was abruptly interrupted. Instead of the nominal 8 hours above 32 km altitude, the instrument could only perform science acquisition for 45 minutes at this altitude. In addition, the shape of the deflated balloon, combined with a full Moon, revealed a severe off-axis scattered light path, directly into the UV science detector and about 100 times larger than expected. In preparation for the next flight, and in addition to describing FIREBall-2's upgrade, this paper discusses the exposure time calculator (ETC) that has been designed to analyze the instrument's optimal performance (explore the instrument's limitations and subtle trade-offs).
