The Atacama Cosmology Telescope: Calibration with WMAP Using Cross-Correlations

Details The Atacama Cosmology Telescope: Calibration with WMAP Using Cross-Correlations The Atacama Cosmology Telescope: Calibration with WMAP Using Cross-Correlations

2010-09-03

arxiv.org/abs/1009.0777v1

The Astrophysical Journal, Volume 740, Issue 2, article id. 86 (2011)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Submitted to ApJ. This is a companion to Das et al (2010) and Dunkley et al (2010)

Scientific paper

10.1088/0004-637X/740/2/86

We present a new calibration method based on cross-correlations with WMAP and apply it to data from the Atacama Cosmology Telescope (ACT). ACT's observing strategy and map making procedure allows an unbiased reconstruction of the modes in the maps over a wide range of multipoles. By directly matching the ACT maps to WMAP observations in the multipole range of 400 < ell < 1000, we determine the absolute calibration with an uncertainty of 2% in temperature. The precise measurement of the calibration error directly impacts the uncertainties in the cosmological parameters estimated from the ACT power spectra. We also present a combined map based on ACT and WMAP data that has high signal-to-noise over a wide range of multipoles.

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