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Title:
First-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: On-Orbit Radiometer Characterization
Authors:
Jarosik, N.; Barnes, C.; Bennett, C. L.; Halpern, M.; Hinshaw, G.; Kogut, A.; Limon, M.; Meyer, S. S.; Page, L.; Spergel, D. N.; Tucker, G. S.; Weiland, J. L.; Wollack, E.; Wright, E. L.
Affiliation:
AA(Department of Physics, Jadwin Hall, Princeton, NJ 08544; .), AB(Department of Physics, Jadwin Hall, Princeton, NJ 08544; .), AC(NASA Goddard Space Flight Center, Code 685, Greenbelt, MD 20771.), AD(Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada .), AE(NASA Goddard Space Flight Center, Code 685, Greenbelt, MD 20771.), AF(NASA Goddard Space Flight Center, Code 685, Greenbelt, MD 20771.), AG(NASA Goddard Space Flight Center, Code 685, Greenbelt, MD 20771.; National Research Council (NRC) Fellow.), AH(Departments of Astrophysics and Physics, EFI, and CFCP, University of Chicago, Chicago, IL 60637.), AI(Department of Physics, Jadwin Hall, Princeton, NJ 08544; .), AJ(Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544.), AK(NASA Goddard Space Flight Center, Code 685, Greenbelt, MD 20771.; National Research Council (NRC) Fellow.; Department of Physics, Brown University, Providence, RI 02912.), AL(Science Systems and Applications, Inc. (SSAI), 10210 Greenbelt Road, Suite 600 Lanham, MD 20706.), AM(NASA Goddard Space Flight Center, Code 685, Greenbelt, MD 20771.), AN(Department of Astronomy, UCLA, P.O. Box 951562, Los Angeles, CA 90095-1562.)
Publication:
The Astrophysical Journal Supplement Series, Volume 148, Issue 1, pp. 29-37. (ApJS Homepage)
Publication Date:
09/2003
Origin:
UCP
ApJ Keywords:
Cosmology: Cosmic Microwave Background, Cosmology: Observations, Instrumentation: Detectors, Radio Continuum: General, Space Vehicles: Instruments
DOI:
10.1086/377221
Bibliographic Code:
2003ApJS..148...29J

Abstract

The WMAP satellite has completed 1 year of measurements of the cosmic microwave background (CMB) radiation using 20 differential high electron mobility transistor (HEMT) based radiometers. All the radiometers are functioning nominally, and characterizations of the on-orbit radiometer performance are presented, with an emphasis on properties that are required for the production of sky maps from the time-ordered data. A radiometer gain model, used to smooth and interpolate the CMB dipole gain measurements, is also presented. No degradation in the sensitivity of any of the radiometers has been observed during the first year of observations.

WMAP is the result of a partnership between Princeton University and the NASA Goddard Space Flight Center. The HEMT amplifiers used in WMAP were supplied by the National Radio Astronomy Observatory. Scientific guidance is provided by the WMAP Science Team.


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