Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004acs..rept....7k&link_type=abstract
Instrument Science Report ACS 2004-11, 22 pages
Astronomy and Astrophysics
Astronomy
Hubble Space Telescope, Hst, Space Telescope Science Institute, Advanced Camera For Surveys, Acs, Hrc, Polarizer Filter
Scientific paper
The goal of the astrometric calibration of the ACS/HRC polarizer filters is to obtain a coordinate system free of distortion to a precision level of 1 mas. So far, such calibrations have been done only for wide-band filters. The observations of the globular cluster 47 Tuc exposed through the representative filters F220W; F250W; F330W; F435W crossed with three blue-optimized UV polarizers, POL0UV; POL60UV; POL120UV , and F475W; F606W; F658W; F775W crossed with three visible-light-optimized polarizers POL0V; POL60V; POL120V have been used to examine the geometric distortion of polarizer filters. The effective PSF library by Anderson and King has been used to obtain the working sets of X; Y coordinates for stars in assorted polarized and non-polarized images. The distortion solution developed by Anderson and King for HRC was used to correct for the low-frequency and high-frequency components as a function of wavelength for broad-band filters. The polarizer filters have also a high-frequency component, tightly correlated with the polarization angle. For each representative filter crossed with a chosen polarizer a 2D correction table was obtained. As a result, the new solution for the polarizer filters has substantially lowered the residual scatter from 0.6 pixels to better than 0.03 pixels. The main conclusion of this study is that the amount of distortion in the polarizer filters, reaching 0:6 pixels and having a complex appearance, can be successfully corrected for down to the required precision level of 1 mas.
Biretta John
Kozhurina-Platais Vera
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