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Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 23 > Chapter 14: ImagingReference Material > 25MAMA—NUV-MAMA, Clear

25MAMA—NUV-MAMA, Clear
Description
The 25MAMA mode with the NUV-MAMA provides high-throughput broad-band near-ultraviolet (NUV) imaging with excellent pixel sampling and very high throughput at ~2500 . The field of view is 25x25 arcsec.
Recommended Uses
Available (but not recommended, see below) for broad-band NUV imaging.
Special Considerations
NUV-MAMA clear images will be somewhat out of focus because the mirror optimally focuses for use of a filter. Whenever possible, use F25SRF2 or F25QTZ instead of 25MAMA for NUV-MAMA imaging.
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 should also consider whether the ACS HRC with the F220W or the F250W filter might be a better choice for their science goals.
Pivot λ ()
Speak
Bλ
R80 (arcsec)
Figure 14.23: 25MAMA NUV-MAMA Integrated System Throughput and Redleak
Table 14.10: 25MAMA NUV-MAMA Sensitivity & Throughput
Figure 14.24: Point Source S/N vs. V+ABν for the 25MAMA NUV-MAMA mode. Top curves are for DARKTIME. Bottom curves are for average sky. Curves are labeled by required exposure time (sec.).
Figure 14.25: Extended Source S/N vs. V+ABν for the 25MAMA NUV-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 14.11: Radial Profile for 25MAMA*
*See STIS ISR 2003-01.
Figure 14.26: Point Source Encircled Energy for 25MAMA NUV-MAMA
Figure 14.27: Point Source Intensity vs. Radius for 25MAMA NUV-MAMA

Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 23 > Chapter 14: ImagingReference Material > 25MAMA—NUV-MAMA, Clear

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