The Astrophysical Journal Supplement Series

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The Astrophysical Journal Supplement Series Volume 148 Number 1 Create an alert RSS this journal

C. Barnes et al. 2003 ApJS 148 51 doi:10.1086/377227

First-Year Wilkinson Microwave Anisotropy Probe (WMAP)* Observations: Galactic Signal Contamination from Sidelobe Pickup

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C. Barnes1, R. S. Hill2, G. Hinshaw3, L. Page1, C. L. Bennett3, M. Halpern4, N. Jarosik5, A. Kogut3, M. Limon1,3,6, S. S. Meyer7, G. S. Tucker6,8, E. Wollack3 and E. L. Wright9

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Abstract References Cited By

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 Lt1 μK. Angular power spectra of the Galactic pickup are presented.


Footnote
*  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.
Subject headings

cosmic microwave background; cosmology: observations; Galaxy: structure; instrumentation: miscellaneous; ISM: structure; methods: data analysis


Dates

Issue 1 (2003 September)

Received 2003 February 11, accepted for publication 2003 May 8



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