The Contribution of Galactic Free-Free Emission to Anisotropies in the Cosmic Microwave Background Radiation Measured by MSAM

Details The Contribution of Galactic Free-Free Emission to Anisotropies in the Cosmic Microwave Background Radiation Measured by MSAM The Contribution of Galactic Free-Free Emission to Anisotropies in the Cosmic Microwave Background Radiation Measured by MSAM

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.1201s&link_type=abstract

American Astronomical Society, 188th AAS Meeting, #12.01; Bulletin of the American Astronomical Society, Vol. 28, p.840

Astronomy and Astrophysics

Astronomy

2

Scientific paper

The Medium Scale Anisotropy Measurement (MSAM) experiment has detected anisotropies in the cosmic microwave background radiation with an rms between about 30 mu K and 90 mu K. MSAM uses double-difference and single-difference demodulation signals from a chopped, 30(') beam at a number of frequencies between 170 and 680 GHz. We observed the region covered by MSAM using the Virginia Tech Spectral Line Imaging Camera (SLIC), a wide-field camera sensitive to faint interstellar Hα emission. We duplicated the MSAM chopping and demodulation procedure using samples from our Hα image (after the subtraction of a continuum image and smoothing to a 30(') beam). The rms in our double-difference and single-difference demodulation signals are 4.4 and 3.0 Rayleighs, respectively. The implied rms for the microwave brightness temperature of the interstellar plasma is <1 mu K at 170 GHz. Thus the MSAM anisotropies are not significantly contaminated by foreground Galactic emission irregularities. This research was supported by NSF grant AST-9319670 and a grant from the Horton Foundation to Virginia Tech.

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