Degree-scale observations of cosmic microwave background anisotropies

Details Degree-scale observations of cosmic microwave background anisotropies Degree-scale observations of cosmic microwave background anisotropies

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...422l..33d&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 422, no. 2, p. L33-L36

Astronomy and Astrophysics

Astrophysics

89

Anisotropy, Background Radiation, Cosmic Rays, Cosmology, Millimeter Waves, Perturbation, Angular Momentum, Balloon-Borne Instruments, Mathematical Models, Signal To Noise Ratios

Scientific paper

We report the first results of a millimeter search for cosmic microwave background (CMB) anisotropies, carried out by means of a balloon experiment (ARGO 1993). The experiment has observed 63 independent sky fields in Hercules with an angular resolution of 52 min full width half maximum (FWHM), in four photometric bands at 2.0, 1.2, 0.8, and 0.5 mm. A statistically significant sky signal has been observed above detector noise at 2.0 and 1.2 mm. The signal is spectrally consistent with CMB anisotropies, while reasonable local sources of anisotropy are excluded. For temperature fluctuations with a coherence angle of Thetac=30 min we get 1.4 x 10-5 is less than Delta(T)/T is less than 3.0 x 10-5(90% confidence interval, calibration error included). The data are also compared to theoretical models and are found to be in agreement with the CMB anisotropy detected by Cosmic Background Explorer (COBE).

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