ACS Polarization Calibration - II. The POLV Filter Angles

Details ACS Polarization Calibration - II. The POLV Filter Angles ACS Polarization Calibration - II. The POLV Filter Angles

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004acs..rept....8b&link_type=abstract

Instrument Science Report ACS 2004-10, 8 pages

Astronomy and Astrophysics

Astronomy

Hubble Space Telescope, Hst, Space Telescope Science Institute, Advanced Camera For Surveys, Acs, Polarization Calibration, Polv Filter

Scientific paper

During the astrometric calibration of the polarizer filters, it was noticed that residual star positions between polarized and non-polarized images were highly anisotropic, and rotate modulo the 60 degree rotations of the polarizer filters. We speculate that this anisotropy is produced during manufacture of the polaroid material, and use this to derive the E-vector directions of the POLV filter set. The resulting angles are within 0.3 degrees of those expected from the ACS design specifications, except for the POL60V filter which shows a difference of 1.5 degrees. This strongly confirms the POLV filters are mounted in the filter wheel near their expected rotation angles, and confirms our overall understanding of the camera geometry.

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