Measurement of the large-scale anisotropy of the cosmic background radiation at 3mm

Technical Report · Thu Dec 01 04:00:00 EST 1983

DOI:https://doi.org/10.2172/5268291· OSTI ID:5268291

Epstein, G L

A balloon-borne differential radiometer has measured the large-scale anisotropy of the cosmic background radiation (CBR) with high sensitivity. The antenna temperature dipole anistropy at 90 GHz (3 mm wavelength) is 2.82 +- 0.19 mK, corresponding to a thermodynamic anistropy of 3.48 +- mK for a 2.7 K blackbody CBR. The dipole direction, 11.3 +- 0.1 hours right ascension and -5.7/sup 0/ +- 1.8/sup 0/ declination, agrees well with measurements at other frequencies. Calibration error dominates magnitude uncertainty, with statistical errors on dipole terms being under 0.1 mK. No significant quadrupole power is found, placing a 90% confidence-level upper limit of 0.27 mK on the RMS thermodynamic quadrupolar anistropy. 22 figures, 17 tables.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5268291
• Report Number(s): LBL-17118; ON: DE84006774
• Country of Publication: United States
• Language: English

Related Subjects

640106* -- Astrophysics & Cosmology-- Cosmology
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AIRSHIPS
ANISOTROPY
BACKGROUND RADIATION
BALLOONS
COSMIC RADIATION
COSMOLOGY
DATA
ELECTROMAGNETIC RADIATION
EXPERIMENTAL DATA
INFORMATION
IONIZING RADIATIONS
MEASURING METHODS
MICROWAVE RADIATION
NUMERICAL DATA
RADIATIONS