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Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 22 > Chapter 14: ImagingReference Material > 25MAMA—FUV-MAMA Clear

25MAMA—FUV-MAMA Clear
Description
The 25MAMA mode with the FUV-MAMA detector provides high-throughput broad-band far-ultraviolet (FUV) imaging with the highest available throughput at ~1500 and the highest possible spatial resolution. The field of view is 25x25 arcsec.
Recommended Uses
Recommended for broad-band NUV imaging of sources where sky background is not a consideration.
Special Considerations
For long exposures of faint targets, sky background is likely to be a limiting factor. Observers should consider the use of DARKTIME or (preferably) use the F25QTZ filter, which has nearly the same throughput but rejects geocoronal Lyman-α and [O I] 1302 + 1306 air glow.
Users may also want to consider whether the ACS SBC detector might be better for their observing program.
 
Pivot λ ()
Speak
Bλ
R80 (arcsec)
Figure 14.66: 25MAMA FUV-MAMA Integrated System Throughput and Redleak
Table 14.26: 25MAMA FUV-MAMA Sensitivity & Throughput
Figure 14.67: Point Source S/N vs. V+ABν for the 25MAMA FUV-MAMA mode. Curves are labeled by required exposure time (seconds).
Figure 14.68: Extended Source S/N vs. V+ABν for the 25MAMA FUV-MAMA mode. Top curves are for an area of 0.2 arcsec2; bottom curves are for 1 arcsec2. Average sky assumed. Curves are labeled by required exposure time (seconds).
Table 14.27: Radial Profile for 25MAMA*
* See STIS ISR 2003-01.
Figure 14.69: Point Source Encircled Energy for 25MAMA FUV-MAMA
Figure 14.70: Point Source Intensity vs. Radius for 25MAMA FUV-MAMA

Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 22 > Chapter 14: ImagingReference Material > 25MAMA—FUV-MAMA Clear

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