A Measurement of the Medium-Scale Anisotropy in the Cosmic Microwave Background Radiation

Details A Measurement of the Medium-Scale Anisotropy in the Cosmic Microwave Background Radiation A Measurement of the Medium-Scale Anisotropy in the Cosmic Microwave Background Radiation

1993-05-18

arxiv.org/abs/astro-ph/9305022v2

Astrophys.J. 422 (1994) L37

Astronomy and Astrophysics

Astrophysics

13 pages + 3 figures (included), LaTeX + AASTeX v3.0

Scientific paper

10.1086/187206

Observations from the first flight of the Medium Scale Anisotropy Measurement (MSAM) are analyzed to place limits on Gaussian fluctuations in the Cosmic Microwave Background Radiation (CMBR). This instrument chops a 30\arcmin\ beam in a 3 position pattern with a throw of $\pm40\arcmin$; the resulting data is analyzed in statistically independent single and double difference datasets. We observe in four spectral channels at 5.6, 9.0, 16.5, and 22.5~\icm, allowing the separation of interstellar dust emission from CMBR fluctuations. The dust component is correlated with the \IRAS\ 100~\micron\ map. The CMBR component has two regions where the signature of an unresolved source is seen. Rejecting these two source regions, we obtain a detection of fluctuations which match CMBR in our spectral bands of $0.6 \times 10^{-5} < \Delta T/T < 2.2 \times 10^{-5}$ (90\% CL interval) for total rms Gaussian fluctuations with correlation angle 0\fdg5, using the single difference demodulation. For the double difference demodulation, the result is $1.1 \times 10^{-5} < \Delta T/T < 3.1 \times 10^{-5}$ (90\% CL interval) at a correlation angle of 0\fdg3.

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