A Search for Small Angular Scale Anisotropy in Cosmic Background Radiation at 90 GHZ from the South Pole.

Details A Search for Small Angular Scale Anisotropy in Cosmic Background Radiation at 90 GHZ from the South Pole. A Search for Small Angular Scale Anisotropy in Cosmic Background Radiation at 90 GHZ from the South Pole.

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phdt........10n&link_type=abstract

Thesis (PH.D.)--PRINCETON UNIVERSITY, 1993.Source: Dissertation Abstracts International, Volume: 54-11, Section: B, page: 5717.

Physics

1

Scientific paper

This thesis reports on a search for arc minute scale anisotropy in cosmic microwave background radiation observed from the South Pole during the austral summer 92-93. The telescope operated with a 50mK bolometric detector, using a single mode waveguide, over a bandwidth of 30 GHz, centered at 90 GHz, where the emission from the known celestial foreground sources is at a minimum. The differential measurement was made using a cassegrain telescope, with the subreflector spinning about the primary axis. This technique gives small offsets in the second harmonic, and is sensitive over a wide range of angular scales. Descriptions of the instrument, the observation and the data analysis are presented. The telescope reached a level of Delta T_ {rms} ~ 11mu K after 85 hours of integration time. Preliminary analysis assuming a gaussian correlated fluctuation yields the correlation coefficient {Delta T over T} = 1.5 times 10^{-5} at 8 arcminutes. This is the lowest limit ever reported at this angular scale.

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