Roman HLWAS Flux Calibration Achieves High Precision

This paper details a novel approach to relative flux calibration for the Roman High Latitude Wide Area Survey (HLWAS), a key component of the Roman Space Telescope's mission. The proposed method utilizes a simplified model with independent flat fields for each detector and wavelength-dependent components, achieving impressive precision with calibration residuals reduced to less than 0.15%. The flexibility offered by the wide optimal dither range (50-240") is a significant advantage, allowing for optimization of other observing program aspects without compromising calibration effectiveness. The authors acknowledge the need for further refinements before applying the method to real data, highlighting the ongoing nature of this research. The potential extension of this formalism to imaging surveys suggests a broader applicability within the Roman Space Telescope's scientific program. This research contributes to the critical task of ensuring accurate and reliable data from the Roman Space Telescope, which is essential for advancing our understanding of cosmology and astrophysics. The availability of precise flux calibration methods directly impacts the quality of scientific results derived from the HLWAS, influencing studies of dark energy, galaxy evolution, and the large-scale structure of the universe. The method's adaptability to various observing strategies further enhances its value for the mission.

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