The Microwave Background on small scales: Cosmological parameters from three seasons of data of the Atacama Cosmology Telescope (ACT).



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Recording Details

Speaker(s): 
PIRSA Number: 
13070009

Abstract

The Atacama Cosmology Telescope (ACT) has mapped the microwave sky to
arcminute scales. We present constraints on parameters from the observations at 148 and 217 GHz respectively by ACT from three years
of observations.  Efficient map-making and spectrum-estimation techniques allow us to probe the acoustic peaks deep into the damping tail, and allow for
confirmation of the concordance model, and tests for deviations from
the standard cosmological picture. We fit a model of primary
cosmological and secondary foreground parameters to the dataset,
including contributions from both the thermal and kinetic
Sunyaev-Zel'dovich effect, Poisson distributed and correlated infrared
sources, radio sources and a term modeling the correlation between the
thermal SZ effect and the Cosmic Infrared Background. We will describe
the multi-frequency likelihood for the ACT data, and present
constraints on a variety of cosmological parameters using this
complete dataset, and put these results in context with the recent results from the Planck satellite.