Measuring Cosmic Microwave Background Radiation Anisotropy on Medium Angular Scales.

Details Measuring Cosmic Microwave Background Radiation Anisotropy on Medium Angular Scales. Measuring Cosmic Microwave Background Radiation Anisotropy on Medium Angular Scales.

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phdt........10p&link_type=abstract

Thesis (PH.D.)--MASSACHUSETTS INSTITUTE OF TECHNOLOGY, 1995.Source: Dissertation Abstracts International, Volume: 56-06, Secti

Physics

Scientific paper

The medium scale anisotropy measurement flown in June of 1992 (MSAMI (1992)) is a balloon-borne, off -axis telescope designed to measure fluctuations in the microwave background radiation (MBR) at 5.6, 9, 16.5, and 22.5 cm^{-1}. The telescope beam width is approximately 0.5^circ as measured in flight. Analysis of the 4.7 hours of sky observation near the North Celestial Pole shows statistically significant fluctuations in the MBR at the 0.5^circ angular scale. Using a Gaussian autocorrelation function analysis, the double difference demodulation is most sensitive at theta c = 0.3^circ and the single difference demodulation at theta c = 0.5^circ. At these angles, the 90% single difference confidence interval is 1.8 times 10^{-5} < Delta T/T < 4.2 times 10^{-5} . For the double difference data, the interval at the most sensitive angle is 1.8 times 10^{-5} < Delta T/T < 3.5 times 10^{-5}. Much of the signal is due to two prominent regions of the sky binned data which are spectrally consistent with small but extended (3 ^' < theta_{rm diam} < 20^') MBR sources. They are not correlated with known foreground sources. (Copies available exclusively from MIT Libraries, Rm. 14-0551, Cambridge, MA 02139-4307. Ph. 617-253-5668; Fax 617-253 -1690.).

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