Microwave observations of the southern sky from the TopHat experiment: The Cosmic Microwave Background and the Magellanic Clouds

Details Microwave observations of the southern sky from the TopHat experiment: The Cosmic Microwave Background and the Magellanic Clouds Microwave observations of the southern sky from the TopHat experiment: The Cosmic Microwave Background and the Magellanic Clouds

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003phdt.........6b&link_type=abstract

Thesis (PhD). THE UNIVERSITY OF CHICAGO, Source DAI-B 64/04, p. 1764, Oct 2003, 156 pages.

Computer Science

Performance

Antarctica

Scientific paper

The TopHat telescope was flown on a Long Duration Balloon (LDB) flight from McMurdo Station, Antarctica, on 4 January 2001. The telescope made repeated observations of a patch comprising ˜6% of the sky, centered on the South Celestial Pole (SCP), over ˜4 sidereal days. The observations were made in five frequency bands centered at 175, 245, 400, 460, and 630 GHz. Maps of the observing region were produced in each channel. This thesis gives an overview of the design and flight performance of the TopHat instrument, with particular attention to the thermal system and the pointing sensors. The data analysis pipeline for the Antarctic flight data is described, with particular emphasis on the pointing model reconstruction, fast map-making techniques, instrument signal contamination, and in-flight noise properties of the instrument. A thorough CMB power spectrum analysis demonstrates that the experiment was unable to make an internally consistent CMB measurement. Finally, the data are analyzed to find the integrated spectra relative to the background of the Large and Small Magellanic Clouds (LMC and SMC) and the star forming region 30-Doradus in the LMC, in combination with data from the Diffuse Infrared Background Experiment (DIRBE). These spectra are fit to a single-component greybody emission model and best-fit dust temperatures, optical depths, and emissivity power-law indices are reported and compared with other measurements in these regions.

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