Effects of Facet, Pixel, and Slit Dimensions on the Performance of a MEMS Type Spectrograph for NGST

Details Effects of Facet, Pixel, and Slit Dimensions on the Performance of a MEMS Type Spectrograph for NGST Effects of Facet, Pixel, and Slit Dimensions on the Performance of a MEMS Type Spectrograph for NGST

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.0807a&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #08.07; Bulletin of the American Astronomical Society, Vol. 33, p.1317

Computer Science

Performance

Scientific paper

We discuss how the pixel scale at the detector, the facet size of the MEMS array, and the spectrograph slit dimensions (width and length) affect the performance of the Near-IR Spectrometer for NGST (NIRSPEC). We consider spectroscopic performance both in terms of single object 'sensitivity' and 'speed' (i.e. number of galaxies observed per unit of observing time), and for R=100 and 1000. We have developed a new NGST Exposure Time Calculator optimized for spectroscopy which incorporates the following features: i) accurate slit losses based on the simulated PSFs generated by Bely et al. (2001), ii) use of 'optimal extraction' techniques for solving the S/N-exposure time equation, and iii) quantitative assessment of the multiplexing gain of the NIRSPEC. We find that the choice of parameters that optimize single-object sensitivity are somewhat different from those that optimize 'speed' in multi-object observations of high density fields. The optimal parameters are also dependent on the spectral resolution. We find that the pixel scale which optimizes sensitivity for R=1000 is in very good agreement with the previous result of Petro & Stockman (2000), after adjusting for the different assumed telescope size.

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