Journal article
The TopHat experiment: A balloon-borne instrument for mapping millimeter and submillimeter emission
The TopHat experiment was designed to measure the anisotropy in the cosmic microwave background radiation on angular scales from 0.degrees 3 to 30 degrees and the thermal emission from both Galactic and extragalactic dust. The balloon-borne instrument had five spectral bands spanning frequencies from 175 to 630 GHz.
The telescope was a compact, 1 m, on-axis Cassegrain telescope designed to scan the sky at a fixed elevation of 78 degrees. The radiometer used cryogenic bolometers coupled to a single feed horn via a dichroic filter system. The observing strategy was intended to efficiently cover a region 48 degrees in diameter centered on the south polar cap with a highly cross-linked and redundant pattern with nearly uniform sky coverage.
The Long Duration Balloon flight over Antarctica in 2001 January surveyed about 6% of the sky. Here we describe the design of the instrument and the achieved in-flight performance and provide a brief discussion of the data analysis.
Language: | English |
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Publisher: | American Astronomical Society |
Year: | 2005 |
Pages: | 59-75 |
ISSN: | 15384365 and 00670049 |
Types: | Journal article |
DOI: | 10.1086/432117 |
ORCIDs: | Nørgaard-Nielsen, Hans Ulrik |