STUDY SUMMARY - IPMU

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<strong>SUMMARY</strong> REPORT WIDE FIELD FIBER-FED OPTICAL MULTI-OBJECT SPECTROMETER (WFMOS) The Data Reduction routines themselves have been split into two packages; Package A (standard spectroscopic data reduction that provides “science ready” data) and Package B (that provides scientific quantities, such as red-shift, from the spectra). Package A follows the data flow shown in Figure 3.15-2: • First the data are amalgamated and identified, and the relevant calibrations selected. • The image data are flat-fielded and bias corrected. • The orders are traced on the image, then extracted to form spectral data. • The spectral data are wavelength calibrated. • The data are then made available for further DR (Package B), QC checks and archiving. Figure 3.15-2: DR Data Flow 57
<strong>SUMMARY</strong> REPORT WIDE FIELD FIBER-FED OPTICAL MULTI-OBJECT SPECTROMETER (WFMOS) 4.0 Instrument Performance 4.1 Optical Throughput Throughput is a key parameter as it ultimately governs how quickly observations can be made. The Optical Throughput allocation, where each element of the design was assigned a throughput to match or exceed was created and these values are included as requirements in the FPRD. As requirements, these values represent the minimum performance; the instrument design strategy is to maximize performance and the Current Best Estimate (CBE) is presented here. As the instrument design matures, continued improvement is sought through subsystem design choices and balancing resources throughout the instrument system to maximize total throughput. The instrument CBE is presented in Table 4.1-1 and is supplemented with the estimated throughput from external factors such as the telescope primary, the WFC, and atmospheric dispersions. The instrument performance estimates, also include the variations between the different surveys. For example, the Dark Energy surveys require a different order sorting filter type from the Galactic Archaeology surveys and produce a different throughput estimate for each survey type. The throughput is presented at the wavelength extremes of 420 nm and 970 nm and several wavelengths in between. 58
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STUDY SUMMARY - IPMU

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