Measurements of cosmic background radiation anisotropy at intermediate angular scale

Details Measurements of cosmic background radiation anisotropy at intermediate angular scale Measurements of cosmic background radiation anisotropy at intermediate angular scale

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...411..529p&link_type=abstract

Astrophysical Journal - Part 1 (ISSN 0004-637X), vol. 411, no. 2, p. 529-533.

Astronomy and Astrophysics

Astrophysics

33

Anisotropy, Bolometers, Cosmic Background Explorer Satellite, Dark Matter, Helium Isotopes, Relic Radiation, Antarctic Regions, Cosmology, Signal Detection

Scientific paper

Results from an Antarctic ground-based experiment devoted to the search for fluctuations in the cosmic background radiation (CBR) are presented. We have developed an off-axis telescope with a Gaussian beam response of 50 arcmin FWHM and with a beam-throw adjustable from 0 to 2 deg. The detector was a He-3 bolometer working at 0.35 K and operating at 2.2 mm wavelength. The data collected show evidence of fluctuations at a level of Delta-T(rms)/T = 4.5 x 10 exp -5 at an angular scale of 40 arcmin. The expected fluctuations obtained by extrapolating the COBE result down to this angular scale, in a cold dark matter scenario, are a factor 2.5 lower (1.8 x 10 exp -5). If residual systematic effects or cold galactic dust emission are responsible for the signal detected, our result should be considered as an upper limit to CBR anisotropy.

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