STIS Instrument Handbook for Cycle 24

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Comparison of G230MB and G230M

The trade-off between using the G230MB or the G230M (which uses the NUV-MAMA) grating modes, depends sensitively on the science goals and your source properties. Figures below show a direct comparison of some of the properties of the G230MB and G230M modes. See also “Comparison of G230LB and G230L”.

 

Figure 13.28: Comparison of Limiting Magnitudes and Fluxes for G230MB and G230M. Plotted are the limiting source magnitudes and fluxes for G230MB and G230M to achieve a signal-to-noise ratio of 10 per 2-pixel spectral resolution element integrated across the PSF, in 1 hour. The prediction due to the Charge Transfer Inefficiency (CTI) effect, computed for the year 2005, is also shown.

Figure 13.29: Comparison of LSFs for G230MB and G230M