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Grating Spectral Response and Sensitivity

Fig. 5.3 (p. gif) to Fig. 5.8 (p. gif) show the SWS grating spectral response  functions for each AOT band, obtained by measuring full scans on the internal blackbody source or an astronomical calibration target. The scans were taken with a step size tex2html_wrap_inline2697 = 1 (maximum resolution in wavelength) and the raw data have been converted to a wavelength scale with optimal precision, i.e., better than 1 scan step. Along the Y-axis is plotted the ratio of the output signal in tex2html_wrap_inline2404 Vs tex2html_wrap_inline2446 (i.e. in instrument units) and the input signal on the entrance slit expressed in Jy (i.e. in astronomical units). In this way, the plots show the overall effective spectral response function of the SWS, linking astronomical flux density to instrument signal level. Apart from the noise in the data of some bands, almost all features, fringes and dips are real. Fringing in astronomical objects may depend on source extent and on effective instrument resolution. The data shown apply for extended sources observed at full resolution, i.e. are not applicable to AOT SWS01, and are believed to have an accuracy of better than 30%.



SWS Consortium
Wed Aug 7 17:20:29 MET DST 1996