Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21111001r&link_type=abstract
American Astronomical Society, AAS Meeting #211, #110.01; Bulletin of the American Astronomical Society, Vol. 39, p.938
Astronomy and Astrophysics
Astronomy
Scientific paper
The Arcminute Cosmology Bolometer Array Receiver (ACBAR) is a multi-frequency 16-element bolometer array which observed from the 2m Viper telescope at the South Pole during the 2001, 2002, 2004 and 2005 Austral winters. ACBAR's small (5') beams allow it to probe the damping tail of the CMB power spectrum, making it highly complementary to experiments at larger angular scales such as WMAP and Boomerang. I will present the CMB temperature anisotropy power spectrum produced from the complete ACBAR data set. This new result includes data from the final 2005 observing season, expanding the total data volume by 210% and the sky coverage by 490% over the previous ACBAR releases. The band-power uncertainties have been reduced by more than a factor of two on angular scales encompassing both the third and fourth acoustic peaks as well as the damping tail of the CMB power spectrum. In addition, the calibration has been significantly improved by using a direct comparison between CMB anisotropy maps measured by WMAP3 and ACBAR to transfer the WMAP dipole-based calibration to ACBAR.
ACBAR Collaboration
Reichardt Christian L.
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