Measurements of cosmic background radiation anisotropy at intermediate angular scale

Abstract

view Abstract Citations (37) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Measurements of Cosmic Background Radiation Anisotropy at Intermediate Angular Scale Piccirillo, Lucio ; Calisse, Paolo Abstract 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' FWHM and with a beam-throw adjustable from 0^deg^ to 2^deg^. The detector was a ^3^He 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^-5^ at an angular scale of 40'. 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^-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. Publication: The Astrophysical Journal Pub Date: July 1993 DOI: 10.1086/172854 Bibcode: 1993ApJ...411..529P Keywords: Anisotropy; Bolometers; Cosmic Background Explorer Satellite; Dark Matter; Helium Isotopes; Relic Radiation; Antarctic Regions; Cosmology; Signal Detection; Space Radiation; COSMOLOGY: COSMIC MICROWAVE BACKGROUND full text sources ADS |