The TopHat experiment: A balloon-borne instrument for mapping millimeter and submillimeter emission

Research output: Contribution to journalJournal article – Annual report year: 2005Researchpeer-review


  • Author: Silverberg, R. F.

  • Author: Cheng, E. S.

  • Author: Aguirre, J.E.

  • Author: Bezaire, J.J.

  • Author: Crawford, T.M.

  • Author: Meyer, S.S.

  • Author: Bier, A.

  • Author: Campano, B.

  • Author: Chen, T.C.

  • Author: Cottingham, D. A.

  • Author: Sharp, E.H.

  • Author: Christensen, P. R.

  • Author: Cordone, S.

  • Author: Timbie, P. T.

  • Author: Dame, R.E.

  • Author: Fixsen, D. J.

  • Author: Kristensen, R.J.K.

  • Author: Nørgaard-Nielsen, Hans Ulrik

    Astrophysics, National Space Institute, Technical University of Denmark, Elektrovej, 2800, Kgs. Lyngby, Denmark

  • Author: Wilson, G. W.

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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.
Original languageEnglish
JournalAstrophysical Journal Supplement Series
Issue number1
Pages (from-to)59-75
Publication statusPublished - 2005

    Research areas

  • cosmic microwave background, cosmology : observations, galaxies : general, balloons
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