|STIS Instrument Handbook for Cycle 24|
The F28X50OIII mode is useful for narrow-band imaging of O III 5007 Å. The narrow bandpass and high spatial resolution provides some advantages over WFPC2 with the F502N filter, although the spatial resolution is not as high as that of ACS/HRC with its F502N filter.This filter has a significant red leak longward of 1 micron. Depending on the source spectrum, the contribution from redleak may swamp the contribution from line emission.
Pivot λ (Å) Speak Bλ R80 (arcsec) Figure 14.12: Throughput for F28x50OIII.Table 14.6: F28X50OIII Sensitivity & Throughput
Figure 14.13: Point Source S/N vs. V+ABν for the F28X50OIII filter.Top curves are for low sky; bottom curves are for average sky. Curves are labeled by required exposure time (seconds).Figure 14.14: Extended Source S/N vs. V+ABν for the F28X50OIII 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 14.7: Radial Profile for F28X50OIII
Figure 14.16: Point Source Encircled Energy for F28X50OIIIFigure 14.17: Point Source Intensity vs. Radius for F28X50OIII