Results from Saskatoon: A Measurement of the Anisotropy in the Cosmic Microwave Background

Details Results from Saskatoon: A Measurement of the Anisotropy in the Cosmic Microwave Background Results from Saskatoon: A Measurement of the Anisotropy in the Cosmic Microwave Background

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...18511802n&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #118.02; Bulletin of the American Astronomical Society, Vol. 26, p.1515

Astronomy and Astrophysics

Astronomy

Scientific paper

A measurement of the anisotropy in the CMBR is described. Two High Electron Mobility Transistor (HEMT) amplifier-based radiometers provide frequency coverage from 26 GHz to 46 GHz in 6 frequency bands and two polarizations. The observations were made from Saskatoon, Saskatchewan in January and February of 1994. There are two primary results: 1) A previous detection of the anisotropy by this group (Wollack et al. 1993) is confirmed. The spectral index of the anisotropy is consistent with that of the CMBR. Both free-free emission and dust emission are ruled out as the sole source of the anisotropy. The root-mean-squared amplitude of the fluctuations for the combined data set is 44(+12}_{-7) mu K. Expressed as the square root of the angular power spectrum in a band of multipoles between le=69(+29}_{-22) , this is delta Tl=sqrt {l(l+1)<|a_l(m|^2>}) = 42(+12}_{-7) mu K. 2) The chopping scheme provides spatial sensitivity from l=50 to l=150 in 5 multipole bands, allowing a determination of the shape of the spatial power spectrum. With the fluctuations expressed as a power law in multipole moment, delta T_l=delta Tle(l/l_e)(m) , a maximum likelihood analysis finds delta Tle=45(+7}_{-6) mu K (not including the 14% calibration uncertainty) and m=-0.4(+0.3}_{-0.4) , with l_e=82. Thus, a mildly falling spectrum is favored at intermediate angular scales.

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