Image Quality
STIS point spread function (PSF) images may be downloaded from the
PSF
Library, based on target color, HST focus, STIS filter, detector, and position
on the detector.
Image quality for a point source is characterized in terms of
encircled energy/intensity
vs. radius.
Spectroscopic image quality for point sources is characterized
in terms of encircled energy or spatial profiles.
Spectroscopic Image Quality for Point Sources
| Encircled Energy Tables |
Spatial Profile Plots |
| G140L, G140M, G230L, G230M |
G140L, G140M, G230L, G230M |
| G230LB, G230MB |
G230LB, G230MB |
| G430L, G430M, G750L, G750M |
G430L, G430M, G750L, G750M |
| E140M, E230M |
E140M, E230M |
| E140H, E230H |
E140H, E230H |
Coronagraphic imaging
with STIS reduces PSF wings
by an order of magnitude several arcsec from the source.
The NUV-MAMA detector PSF has broader wings
than the FUV-MAMA PSF because the NUV photocathode coating is on the
dewar window instead of directly on the
microchannel plate surface.
A
new geometric-distortion solution
for the NUV-MAMA has been obtained and a new geometric distortion table is in
full use by the OTFR system.
First-order spectra of point sources contain weak
satellite spectra
of PSF Airy rings. Separation increases with wavelength.
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