Simulation and Spectrum Extraction in the Spectroscopic Channel of the SNAP Experiment

Details Simulation and Spectrum Extraction in the Spectroscopic Channel of the SNAP Experiment Simulation and Spectrum Extraction in the Spectroscopic Channel of the SNAP Experiment

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...209.9821t&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #98.21; Bulletin of the American Astronomical Society, V

Physics

Optics

Scientific paper

A pixel-level simulation software is described. It is composed of two modules. The first module applies Fourier optics at each active element of the system to construct the PSF at a large variety of wavelengths and spatial locations of the point source. The input is provided by the engineer's design program (Zemax). It describes the optical path and the distortions. The PSF properties are compressed and interpolated using shapelets decomposition and neural network techniques. A second module is used for production jobs. It uses the output of the first module to reconstruct the relevant PSF and integrate it on the detector pixels. Extended and polychromatic sources are approximated by a combination of monochromatic point sources.
For the spectrum extraction, we use a fast simulator based on a multidimensional linear interpolation of the pixel response tabulated on a grid of values of wavelength, position on sky and slice number. The prediction of the fast simulator is compared to the observed pixel content, and a chi-square minimization where the parameters are the bin contents is used to build the extracted spectrum. The visible and infrared arms are combined in the same chi-square, providing a single spectrum.

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