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Five-Year Wilkinson Microwave Anisotropy Probe (WMAP)Observations: Beam Maps and Window FunctionsCosmology and other scientific results from the WMAP mission require an accurate knowledge of the beam patterns in flight. While the degree of beam knowledge for the WMAP one-year and three-year results was unprecedented for a CMB experiment, we have significantly improved the beam determination as part of the five-year data release. Physical optics fits are done on both the A and the B sides for the first time. The cutoff scale of the fitted distortions on the primary mirror is reduced by a factor of approximately 2 from previous analyses. These changes enable an improvement in the hybridization of Jupiter data with beam models, which is optimized with respect to error in the main beam solid angle. An increase in main-beam solid angle of approximately 1% is found for the V2 and W1-W4 differencing assemblies. Although the five-year results are statistically consistent with previous ones, the errors in the five-year beam transfer functions are reduced by a factor of approximately 2 as compared to the three-year analysis. We present radiometry of the planet Jupiter as a test of the beam consistency and as a calibration standard; for an individual differencing assembly. errors in the measured disk temperature are approximately 0.5%.
Document ID
20080032974
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Hill, R.S. (ADNET Systems, Inc. Potomac, MD, United States)
Weiland, J.L. (ADNET Systems, Inc. Potomac, MD, United States)
Odegard, N. (ADNET Systems, Inc. Potomac, MD, United States)
Wollack, E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hinshaw, G. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Larson, D. (Johns Hopkins Univ. Baltimore, MD, United States)
Bennett, C.L. (Johns Hopkins Univ. Baltimore, MD, United States)
Halpern, M. (British Columbia Univ. Vancouver, British Columbia, Canada)
Kogut, A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Page, L. (Princeton Univ. NJ, United States)
Dunkley, J. (Princeton Univ. NJ, United States)
Gold, B. (Johns Hopkins Univ. Baltimore, MD, United States)
Jarosik, N. (Princeton Univ. NJ, United States)
Spergel, D.N. (Princeton Univ. NJ, United States)
Limon, M. (Columbia Univ. New York, NY, United States)
Nolta, M.R. (Canadian Inst. for Theoretical Astrophysics Toronto, Ontario, Canada)
Tucker, G.S. (Brown Univ. Providence, RI, United States)
Wright, E.L. (California Univ. Los Angeles, CA, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2008
Subject Category
Astrophysics
Distribution Limits
Public
Copyright
Public Use Permitted.

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