|Space Telescope Science Institute|
|COS Instrument Handbook|
The G160M grating samples wavelengths between about 1405 and 1775 Å. It offers higher resolution and effective area than the G140L grating, but less spectral coverage.The gap between segments A and B spans 18.1 Å. To fill this gap requires exposures separated by two central-wavelength settings.
R = λ/Δλ
Figure 13.10: Wavelength Ranges for the G160M GratingTable 13.6: G160M Point-Source Sensitivity for PSA
(counts pixel-1 sec-1 pererg cm-2 sec-1 Å-1)
Effective Area (cm2) Figure 13.11: G160M Point-Source Sensitivity for PSA and BOAFigure 13.12: Point-Source Signal-to-Noise as a Function of STMAG for G160M at 1610 ÅThe top axis displays constant Fλ values corresponding to the STMAG units (V+STMAGλ) on the bottom axis. Recall that STMAG = 0 is equivalent to Fλ = 3.63E-9 erg cm-2 s-1 Å-1. Colors refer to exposure times in seconds. The edge of the shaded area corresponds to the bright-object screening limit. Use of the PSA is assumed.