Physics – Optics
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004acs..rept....3a&link_type=abstract
Instrument Science Report ACS 2004-15, 51 pages
Physics
Optics
Hubble Space Telescope, Hst, Space Telescope Science Institute, Advanced Camera For Surveys, Acs, Hrc, Psf
Scientific paper
The distortion in the HRC has two components: a low-frequency component from the OTA and ACS optics, and a high-frequency component introduced by the particular filter used. We use a polynomial to treat the general distortion caused by the optics, and use a supplementary correction table to treat the ¯ne-scale distortions introduced by ten of the commonly used wide-band filters. This new distortion correction is accurate to better than 0.01 pixel, and appears to be quite stable over time. In the process of constructing this correction, we naturally have to develop accurate techniques for measuring stars. We extend the effective-PSF work we did for WFPC2 to the HRC, and find that we can measure bright stars to an accuracy of better than 0.01 pixel in each coordinate in a single exposure. We also find that the PSF core appears to change shape very little, either with location on the chip or over time, even though the ratio of core-to-halo flux can change over time by +/-3%
Anderson Jeffrey
King Ivan R.
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