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Title:
First-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Galactic Signal Contamination from Sidelobe Pickup
Authors:
Barnes, C.; Hill, R. S.; Hinshaw, G.; Page, L.; Bennett, C. L.; Halpern, M.; Jarosik, N.; Kogut, A.; Limon, M.; Meyer, S. S.; Tucker, G. S.; Wollack, E.; Wright, E. L.
Affiliation:
AA(Department of Physics, Jadwin Hall, Princeton, NJ 08544; .), AB(Science Systems and Applications, Inc. (SSAI), 10210 Greenbelt Road, Suite 600, Lanham, MD 20706.), AC(NASA Goddard Space Flight Center, Code 685, Greenbelt, MD 20771.), AD(Department of Physics, Jadwin Hall, Princeton, NJ 08544; .), AE(NASA Goddard Space Flight Center, Code 685, Greenbelt, MD 20771.), AF(Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada.), AG(WMAP is the result of a partnership between Princeton University and the NASA Goddard Space Flight Center. Scientific guidance is provided by the WMAP Science Team.), AH(NASA Goddard Space Flight Center, Code 685, Greenbelt, MD 20771.), AI(Department of Physics, Jadwin Hall, Princeton, NJ 08544; .; NASA Goddard Space Flight Center, Code 685, Greenbelt, MD 20771.; National Research Council Fellow.), AJ(Departments of Astrophysics and Physics, EFI, and CfCP, University of Chicago, Chicago, IL 60637.), AK(National Research Council Fellow.; Department of Physics, Brown University, Providence, RI 02912.), AL(NASA Goddard Space Flight Center, Code 685, Greenbelt, MD 20771.), AM(Department of Astronomy, UCLA, P.O. Box 951562, Los Angeles, CA 90095-1562.)
Publication:
The Astrophysical Journal Supplement Series, Volume 148, Issue 1, pp. 51-62. (ApJS Homepage)
Publication Date:
09/2003
Origin:
UCP
ApJ Keywords:
Cosmology: Cosmic Microwave Background, Cosmology: Observations, Galaxy: Structure, Instrumentation: Miscellaneous, ISM: Structure, Methods: Data Analysis
DOI:
10.1086/377227
Bibliographic Code:
2003ApJS..148...51B

Abstract

Since the Galactic center is ~1000 times brighter than fluctuations in the cosmic microwave background (CMB), CMB experiments must carefully account for stray Galactic pickup. We present the level of contamination due to sidelobes for the first-year CMB maps produced by the Wilkinson Microwave Anisotropy Probe (WMAP) observatory. For each radiometer, full 4π sr antenna gain patterns are determined from a combination of numerical prediction and ground-based and space-based measurements. These patterns are convolved with the WMAP first-year sky maps and observatory scan pattern to generate the expected sidelobe signal contamination, for both intensity and polarized microwave sky maps. When the main beams are outside of the Galactic plane, we find rms values for the expected sidelobe pickup of 15, 2.1, 2.0, 0.3, and 0.5 μK for the K, Ka, Q, V, and W bands, respectively. Except for at the K band, the rms polarized contamination is <<1 μK. Angular power spectra of the Galactic pickup are presented.

WMAP is the result of a partnership between Princeton University and the NASA Goddard Space Flight Center. Scientific guidance is provided by the WMAP Science Team.


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