Measurement of the large-scale anisotropy of the cosmic background radiation at 3mm
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 National Lab. (LBNL), Berkeley, CA (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5268291
- Report Number(s):
- LBL-17118; ON: DE84006774
- Resource Relation:
- Other Information: Thesis
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
BACKGROUND RADIATION
ANISOTROPY
COSMIC RADIATION
MICROWAVE RADIATION
BALLOONS
COSMOLOGY
EXPERIMENTAL DATA
MEASURING METHODS
AIRSHIPS
DATA
ELECTROMAGNETIC RADIATION
INFORMATION
IONIZING RADIATIONS
NUMERICAL DATA
RADIATIONS
640106* - Astrophysics & Cosmology- Cosmology