Open AccessFirst‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: On‐Orbit Radiometer Characterization
Author(s) -
N. Jarosik,
C. Barnes,
C. L. Bennett,
M. Halpern,
G. Hinshaw,
A. Kogut,
M. Limon,
S. S. Meyer,
Lyman A. Page,
David N. Spergel,
Gregory S. Tucker,
J. L. Weiland,
Edward J. Wollack,
E. L. Wright
Publication year - 2003
Publication title -
the astrophysical journal supplement series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.546
H-Index - 277
eISSN - 1538-4365
pISSN - 0067-0049
DOI - 10.1086/377221
Subject(s) - radiometer , cmb cold spot , cosmic microwave background , physics , satellite , microwave , remote sensing , sensitivity (control systems) , sky , anisotropy , astrophysics , optics , astronomy , geology , quantum mechanics , engineering , electronic engineering
The WMAP satellite has completed one year of measurements of the CosmicMicrowave Background (CMB) radiation using 20 differentialhigh-electron-mobility-transistor (HEMT) based radiometers. All the radiometersare functioning nominally, and characterizations of the on-orbit radiometerperformance are presented, with an emphasis on properties that are required forthe production of sky maps from the time ordered data. A radiometer gain model,used to smooth and interpolate the CMB dipole gain measurements is alsopresented. No degradation in the sensitivity of any of the radiometers has beenobserved during the first year of observations.
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