Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 17

0.2X0.09 Aperture

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Description

This slit is used with high resolution echelle gratings. This slit is two pixels wide in dispersion for these gratings, providing optimal spectral resolution and line profiles.

Special Considerations

Used with E140H and E230H grating only. Observations with this slit require a prior PEAKUP.

Table 13.26: 0.2X0.09 Throughputs

	% Throughput
1200	27.0
1800	57.5
2400	65.4
3000	68.5
3600	68.6
6000	64.9

Aperture	Projected Length (arcsec) (MAMA E-modes)	Width (arcsec)
0.2X0.09	0.2	0.09

Figure 13.73: 0.2X0.09 Aperture Throughput as a Function of Wavelength