A Spin Modulated Telescope to Make Two Dimensional CMB Maps

Details A Spin Modulated Telescope to Make Two Dimensional CMB Maps A Spin Modulated Telescope to Make Two Dimensional CMB Maps

1999-12-09

arxiv.org/abs/astro-ph/9912212v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures

Scientific paper

10.1086/309236

We describe the HEMT Advanced Cosmic Microwave Explorer (HACME), a balloon borne experiment designed to measure sub-degree scale Cosmic Microwave Background anisotropy over hundreds of square degrees, using a unique two dimensional scanning strategy. A spinning flat mirror that is canted relative to its spin axis modulates the direction of beam response in a nearly elliptical path on the sky. The experiment was successfully flown in February of 1996, achieving near laboratory performance for several hours at float altitude. A map free of instrumental systematic effects is produced for a 3.5 hour observation of 630 square degrees, resulting in a flat band power upper limit of (l(l+1)C_l/2 pi)^0.5 < 77 microK at l = 38 (95% confidence). The experiment design, flight operations and data, including atmospheric effects and noise performance, are discussed.

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