Absolute polarization angle calibration using polarized diffuse Galactic emission observed by BICEP
We present a method of cross-calibrating the polarization angle of a polarimeter using Bicep Galactic observations. Bicep was a ground based experiment using an array of 49 pairs of polarization sensitive bolometers observing from the geographic South Pole at 100 and 150 GHz. The Bicep polarimeter i...
Main Authors: | , , , , , , , |
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Other Authors: | , |
Format: | Book Part |
Language: | English |
Published: |
Society of Photo-optical Instrumentation Engineers (SPIE)
2010
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Subjects: | |
Online Access: | https://authors.library.caltech.edu/22876/ https://authors.library.caltech.edu/22876/2/Matsumura2010p12887Adaptive_Optics_Systems_Pts_1-3.pdf https://resolver.caltech.edu/CaltechAUTHORS:20110314-155138851 |
Summary: | We present a method of cross-calibrating the polarization angle of a polarimeter using Bicep Galactic observations. Bicep was a ground based experiment using an array of 49 pairs of polarization sensitive bolometers observing from the geographic South Pole at 100 and 150 GHz. The Bicep polarimeter is calibrated to ±0.01 in cross-polarization and less than ±0.7° in absolute polarization orientation. Bicep observed the temperature and polarization of the Galactic plane (R.A = 100° ~ 270° and Dec. = -67° ~ -48°). We show that the statistical error in the 100 GHz Bicep Galaxy map can constrain the polarization angle offset of Wmap W band to 0.6° ± 1.4°. The expected 1σ errors on the polarization angle cross-calibration for Planck or EPIC are 1.3° and 0.3° at 100 and 150 GHz, respectively. We also discuss the expected improvement of the Bicep Galactic field observations with forthcoming Bicep2 and Keck observations. |
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