The TopHat Experiment: A Balloon-borne Instrument for Mapping Millimeter and Submillimeter Emission

Details The TopHat Experiment: A Balloon-borne Instrument for Mapping Millimeter and Submillimeter Emission The TopHat Experiment: A Balloon-borne Instrument for Mapping Millimeter and Submillimeter Emission

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apjs..160...59s&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 160, Issue 1, pp. 59-75.

Astronomy and Astrophysics

Astronomy

3

Balloons, Cosmology: Cosmic Microwave Background, Cosmology: Observations, Galaxies: General

Scientific paper

The TopHat experiment was designed to measure the anisotropy in the cosmic microwave background radiation on angular scales from 0.3d to 30° 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°. 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° 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.

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