WFPC2 Ghosts, Scatter, and PSF Field Dependence

Details WFPC2 Ghosts, Scatter, and PSF Field Dependence WFPC2 Ghosts, Scatter, and PSF Field Dependence

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995wfpc.rept....5k&link_type=abstract

WFPC2 Instrument Science Report 95-05, 11 pages

Physics

Optics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 2, Wfc2

Scientific paper

Scattered light and ghosts in WFPC2 images are discussed, with emphasis on their effects on imaging of faint objects near bright ones. Scattering within about two arcseconds is primarily due to diffraction effects from zonal errors in the HST optics. At larger angles, the main source of light is scattering from the CCD surface.
Also, a number of ghosts are present in WFPC2. Some of these may be mistaken as stars, and others may interfere with the imaging of nearby material.
The field dependence of the WFPC2 PSF is also discussed. PSF structure can change appreciably across a single chip due to obscuration shifting, focus, coma, and astigmatism changes. These changes can affect PSF subtraction and profile fitting photometry.

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