Cosmic Microwave Background Maps from the HACME Experiment

Details Cosmic Microwave Background Maps from the HACME Experiment Cosmic Microwave Background Maps from the HACME Experiment

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...541..535t&link_type=abstract

The Astrophysical Journal, Volume 541, Issue 2, pp. 535-541.

Astronomy and Astrophysics

Astronomy

4

Balloons, Cosmology: Cosmic Microwave Background, Cosmology: Observations

Scientific paper

We present cosmic microwave background (CMB) maps from the Santa Barbara HACME balloon experiment (Staren et al.), covering about 1150 square degrees split between two regions in the northern sky, near the stars γ Ursae Minoris and α Leonis, respectively. The FWHM of the beam is ~0.77d in three frequency bands centered on 39, 41, and 43 GHz. The results demonstrate that the thoroughly interconnected scan strategy employed allows efficient removal of 1/f-noise and slightly variable scan-synchronous offsets. The maps display no striping, and the noise correlations are found to be virtually isotropic, decaying on an angular scale ~1°. The noise performance of the experiment resulted in an upper limit on CMB anisotropy. However, our results demonstrate that atmospheric contamination and other systematics resulting from the circular scanning strategy can be accurately controlled and bode well for the planned follow-up experiments BEAST and ACE, since they show that even with the overly cautious assumption that 1/f-noise and offsets will be as dominant as for HACME, the problems they pose can be readily overcome with the mapmaking algorithm discussed. Our prewhitened notch-filter algorithm for destriping and offset removal is proving useful also for other balloon- and ground-based experiments whose scan strategies involve substantial interleaving, e.g., Boomerang.

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