|STIS Instrument Handbook for Cycle 24|
The F28X50LP mode is useful for deep imaging longward of 5500 Å. For a fixed exposure time it can detect point sources roughly as faint as with WFPC2 with the F606W filter, but with higher spatial resolution. The field of view is 28x50”. The ACS/WFC with the F814W filter will be more appropriate for most programs.Recommended for deep high-resolution imaging between 5500 Å and 10,000 Å. Default aperture for target acquisitions.
Pivot λ (Å) Speak Bλ R80 (arcsec) Figure 14.7: Throughput for F28x50LPTable 14.4: F28X50LP Sensitivity & Throughput
Figure 14.8: Point Source S/N vs. V+ABν for the F28X50LP filter. Top curves are for low sky; bottom curves are for average sky. Curves are labeled by required exposure time (seconds).Figure 14.9: Extended Source S/N vs. V+ABν for the F28X50LP filter for gain=1. Top curves are for a source area of 0.2 arcsec2; bottom curves are for 1 arcsec2. Average sky assumed. Curves are labeled by required exposure time (seconds).Table 14.5: Radial Profile for F28X50LP
Figure 14.10: Point Source Encircled Energy for F28X50LPFigure 14.11: Point Source Intensity vs. Radius for F28X50LP