Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..338..126k&link_type=abstract
Astrometry in the Age of the Next Generation of Large Telescopes, ASP Conference Series, Vol. 338, Proceedings of a meeting held
Astronomy and Astrophysics
Astronomy
Scientific paper
The Hubble Space Telecope's ACS/HRC camera is optimized for high resolution (27 mas/pix), allowing us to reach a sub-mas regime in differential astrometry. Here we consider the ACS/HRC astrometric properties through polarizer filters, if one would like to compare polarized and non-polarized images of the same targets. The geometric distortion of polarizer filters not only has the low- and high-frequency components, as found by Anderson & King for wide-band filters, but also shows a complicated anisotropic structure tightly correlated with polarization angle. Thus, instead of a polynomial model, the mapping technique was used in differential mode to correct for distortion, which at maximum reaches 15 mas. As a result, the post-correction residuals show only 0.8 mas scatter. At the moment, the ACS/HRC is the only existing imaging instrument capable of delivering sub-mas astrometry in various filters from a single observation, although in a very small field-of-view.
Biretta John
Kozhurina-Platais Vera
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