Calibration and systematic error analysis for the COBE(1) DMR 4year sky maps

Journal Article · Thu Jan 04 00:00:00 EST 1996 · Astrophysical Journal

OSTI ID:894237

Kogut, A; Banday, A J; Bennett, C L; Gorski, K M; Hinshaw, G; Jackson, P D; Keegstra, P; Lineweaver, C; Smoot, G F; Tenorio, L; Wright, E L

The Differential Microwave Radiometers (DMR) instrument aboard the Cosmic Background Explorer (COBE) has mapped the full microwave sky to mean sensitivity 26 mu K per 7 degrees held of view. The absolute calibration is determined to 0.7 percent with drifts smaller than 0.2 percent per year. We have analyzed both the raw differential data and the pixelized sky maps for evidence of contaminating sources such as solar system foregrounds, instrumental susceptibilities, and artifacts from data recovery and processing. Most systematic effects couple only weakly to the sky maps. The largest uncertainties in the maps result from the instrument susceptibility to Earth's magnetic field, microwave emission from Earth, and upper limits to potential effects at the spacecraft spin period. Systematic effects in the maps are small compared to either the noise or the celestial signal: the 95 percent confidence upper limit for the pixel-pixel rms from all identified systematics is less than 6 mu K in the worst channel. A power spectrum analysis of the (A-B)/2 difference maps shows no evidence for additional undetected systematic effects.

• Research Organization: COLLABORATION - NASA
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 894237
• Report Number(s): LBNL--61836
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 470; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ASTROPHYSICS
CALIBRATION
DATA COVARIANCES
MAGNETIC FIELDS
MICROWAVE RADIATION
RADIOMETERS
SENSITIVITY
SOLAR SYSTEM