F25MGII-NUV-MAMA

Description

The F25MGII filter with the NUV-MAMA provides narrow-band imaging centered on the 2798 Å MgII feature.

Recommended Uses

Narrowband imaging.

Special Considerations

There is a substantial redleak in this filter. Sources with a red underlying continuum may be difficult to observe. Users should be careful to take into account the underlying continuum in estimating whether the observation will fall within the bright-object protection limits. This filter also has a complex PSF and exhibits several ghosts.

Figure 14.44: Point Source PSF for F25MGII NUV-MAMA 7."5 square (at pixel 316,658, log scaled, B-V=-0.04). Note psf ghost ~45 pixels left of peak pixel and a few 10^-3 of the peak, as well as the much more complex ghost about 10 pixels to the right of the central pixel.

Pivot (Å)	FWHM (Å)	AB mag zeropoint	Speak	B	R80 (arcsec)	Flux in central pixel
2801.7	48.0	19.510	8.22+13	55.9	0.18	14%

Figure 14.45: F25MGII NUV-MAMA Integrated System Throughput and Redleak

Figure 14.46: Point Source S/N vs. V+AB for the F25MGII NUV-MAMA mode. Curves are labeled by required exposure time (sec).

Figure 14.47: Extended Source S/N vs. V+AB for the F25MGII 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 (sec).

* See STIS ISR 2003-01.

Figure 14.48: Point Source Encircled Energy for F25MGII NUV-MAMA

Figure 14.49: Point Source Intensity vs. Radius for F25MGII NUV-MAMA