Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...475l..73t&link_type=abstract
Astrophysical Journal Letters v.475, p.L73
Astronomy and Astrophysics
Astronomy
36
Balloons, Cosmology: Cosmic Microwave Background, Cosmology: Observations
Scientific paper
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 0.dg7 FWHM beams separated by 3.dg6. 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 Delta T/T = 3.1 ^{+3.1}_{-1.1} x 10-5 (90% confidence interval) for a correlation angle of 1.dg2. This corresponds to Q-flat = 35.9 ^{+17.7}_{-6.3} mu K (1 sigma ).
Gush H. P.
Halpern Mark
Shinkoda I.
Towlson W.
Tucker Gregory S.
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