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 2008-2010.
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 standard cosmological model, and tests for deviations from
this 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 modelling 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.