THE ATACAMA COSMOLOGY TELESCOPE: A MEASUREMENT OF THE COSMIC MICROWAVE BACKGROUND POWER SPECTRUM AT 148 AND 218 GHz FROM THE 2008 SOUTHERN SURVEY
- 9 February 2011
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 729 (1) , 62
- https://doi.org/10.1088/0004-637x/729/1/62
Abstract
We present measurements of the cosmic microwave background (CMB) power spectrum made by the Atacama Cosmology Telescope at 148 GHz and 218 GHz, as well as the cross-frequency spectrum between the two channels. Our results clearly show the second through the seventh acoustic peaks in the CMB power spectrum. The measurements of these higher-order peaks provide an additional test of the ΛCDM cosmological model. At ℓ>3000, we detect power in excess of the primary anisotropy spectrum of the CMB. At lower multipoles 500 < ℓ < 3000, we find evidence for gravitational lensing of the CMB in the power spectrum at the 2.8σ level. We also detect a low level of Galactic dust in our maps, which demonstrates that we can recover known faint, diffuse signals.Keywords
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