Detection of Cosmic Microwave Background Anisotropy by the Third Flight of the Medium-Scale Anisotropy Measurement

Details Detection of Cosmic Microwave Background Anisotropy by the Third Flight of the Medium-Scale Anisotropy Measurement Detection of Cosmic Microwave Background Anisotropy by the Third Flight of the Medium-Scale Anisotropy Measurement

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...488l..59c&link_type=abstract

Astrophysical Journal Letters v.488, p.L59

Astronomy and Astrophysics

Astronomy

37

Balloons, Cosmic Microwave Background, Cosmology: Observations, Infrared: Ism: Continuum

Scientific paper

The third flight of the Medium-Scale Anisotropy Measurement (MSAM1), in 1995 June, observed a new strip of sky, doubling the sky coverage of the original MSAM1 data set. MSAM1 observes with a 0.dg5 beam size in four bands from 5 to 20 cm-1. From these four bands we derive measurements of cosmic microwave background radiation (CMBR) anisotropy and interstellar dust emission. Our measurement of dust emission correlates well with the 100 mu m IRAS Sky Survey Atlas; from this comparison we determine an effective emissivity spectral index between 100 mu m and 444 mu m of 1.46+/-0.28 . Analysis of our measurement of CMBR anisotropy shows that for Gaussian-shaped correlation functions with theta c = 0.dg3, we place a limit on total rms anisotropy of 2.2x10^{-5}< Delta T/T<3.9x10^{-5} (90% confidence interval, including calibration error). The band-power limits are < delta T>=^{1/2}=50^{+16}_{-11} mu {K} at l=160 , and < delta T>=65^{+18}_{-13} mu {K} at l=270 (1 sigma limits, including calibration error). The corresponding limits with statistical errors only are < delta T>=50^{+13}_{-9} mu {K} and < delta T>=65^{+14}_{-10} mu {K} , respectively. These measurements are consistent with a standard adiabatic cold dark matter model; we discuss constraints on h, n, and the redshift of reionization.

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