Prime Focus Spectrograph is a state-of-the-art multifiber spectrograph being installed on the Subaru telescope. High-quality sky subtraction is of crucial importance for its successful operation. Here we describe the status of the development of modeling algorithms for point spread function determination and subtraction of skylines. Defocused data taken with dedicated lamps allows us to determine the illumination properties of individual fibers, and to determine wavefront aberrations that are present in the instrument. Based on those inputs, we are able to model the point spread function in 2D and achieve sub 1% subtraction quality for significant parts of the wavelength range covered by the available data.
The Prime Focus Spectrograph (PFS) is a new optical/near-infrared multi-fiber spectrograph designed for the prime focus of the 8.2m Subaru telescope. PFS will cover 1.3 degrees diameter field with 2394 fibers to complement the imaging capability of Hyper SuprimeCam (HSC). The prime focus unit of PFS called Prime Focus Instrument (PFI) provides the interface with the top structure of Subaru telescope and also accommodates the optical bench in which Cobra fiber positioners and fiducial fibers are located. In addition, the acquisition and guiding cameras (AGCs), the cable wrapper, the fiducial fiber illuminator, and viewer, the field element, and the telemetry system are located inside the PFI. The mechanical structure of the PFI was designed with special care such that its deflections sufficiently match those of the HSC’s Wide Field Corrector (WFC) so the fibers will stay on targets over the course of the observations within the required accuracy. The assembly, integration and verification of PFI was completed in 2021. The performance of PFI meets the requirements and it was delivered to Subaru telescope in June 2021. Consequently, various tests and engineering runs were carried out to calibrate the PFI and verify the performance of the PFI with the telescope.
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