Showing papers by "Mark Halpern published in 1997"
TL;DR: In this article, the first flight of a new balloon-borne instrument, BAM (Balloon-borne Anisotropy Measurement), designed to search for cosmic microwave background (CMB) anisotropic, was reported.
Abstract: Results are reported from the first flight of a new balloon-borne instrument, BAM (Balloon-borne Anisotropy Measurement), designed to search for cosmic microwave background (CMB) anisotropy. The instrument uses a cryogenic differential Fourier transform spectrometer to obtain data in five spectral channels whose central frequencies lie in the range 3.7-8.5 cm-1. The spectrometer is coupled to an off-axis prime focus telescope; the combination yields difference spectra of two regions on the sky defined by 07 FWHM beams separated by 36. Single differences obtained at 10 sky positions show statistically significant fluctuations. Assuming Gaussian correlated anisotropy, for the band average 3.1-9.2 cm-1, one finds ΔT/T = 3.1−1.1+3.1 × 10-5 (90% confidence interval) for a correlation angle of 12. This corresponds to Qflat = 35.9−6.3+17.7 μK (1 σ).
40 citations