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Collaborators: M. Ntampaka, F. Dauphin, S. Ravindranath Project includes full funding starting January 12, 2022

Modern wide-field imaging surveys performed by Roman Space Telescope and Vera Rubin Observatory's Large Synoptic Survey will open a new window on the Universe, enabling the discovery and study of stars and galaxies too faint to be studied previously. To realize the full scientific potential of these surveys, we must examine those objects using spectroscopic techniques. Given the large numbers of objects to be studied – some individual science cases require observations of tens of millions of sources – we must develop an efficient process to carry out these surveys. Several massively multiplexed spectroscopic instruments from the ground are currently in the planning phase or nearing execution.  High-quality calibration and stability are required to ensure that millions of fiber hours with 8-10-m class facilities. Most science cases for these massively multiplexed missions will rely on their ability to detect faint sources and/or measure the widths of narrow lines next to skylines. Both capabilities are dependent on our ability to subtract the contribution of the sky to the observed spectra. 

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