Prime focus spectrograph (PFS) for Subaru Telescope: modeling of the 2D point spread function using commissioning data

Kota Hayashi; Neven Caplar; Kiyoto Yabe; Robert Lupton; James Gunn; Masahiro Takada; Naoyuki Tamura; Yuki Moritani; Satoshi Kawanomoto; Naoki Yasuda

doi:10.1117/12.3019024

19 July 2024 Prime focus spectrograph (PFS) for Subaru Telescope: modeling of the 2D point spread function using commissioning data

Kota Hayashi, Neven Caplar, Kiyoto Yabe, Robert Lupton, James Gunn, Masahiro Takada, Naoyuki Tamura, Yuki Moritani, Satoshi Kawanomoto, Naoki Yasuda

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130969R (2024) https://doi.org/10.1117/12.3019024
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

Prime Focus Spectrograph (PFS), a next-generation instrument being installed on the 8.2m Subaru Telescope, is a very wide-field, massively multiplexed, optical and near-infrared spectrograph. For its successful science operation, high-quality sky subtraction is of crucial importance to accurately extract weak galaxy signals. To achieve that, we are now developing modeling algorithms to determine the 2D point spread function (PSF) at arbitrary positions on the spectrograph detectors. The light coming into the detectors is affected by various components of the instrument before being observed as the final PSF, such as the telescope pupil illumination, focal ratio degradation in the fibers, and various aberrations of the spectrograph optics. We model the PSF by combining optical models of all these effects. Comparing the model with the data taken in commissioning observations, we determine over a hundred parameters. We present the current status of this PSF modeling.

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Kota Hayashi, Neven Caplar, Kiyoto Yabe, Robert Lupton, James Gunn, Masahiro Takada, Naoyuki Tamura, Yuki Moritani, Satoshi Kawanomoto, and Naoki Yasuda "Prime focus spectrograph (PFS) for Subaru Telescope: modeling of the 2D point spread function using commissioning data", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130969R (19 July 2024); https://doi.org/10.1117/12.3019024

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