Synergies between the Atacama Cosmology Telescope and Planck CMB observations

The Atacama Cosmology Telescope (ACT) has provided detailed measurements at millimeter wavelengths with arcminute resolution, resulting in an observed Cosmic Microwave Background (CMB) temperature anisotropy field that spans angular harmonic multipole 500<l<10000 on the sky. At scales of few arcminute the fluctuations of the primordial CMB become increasingly obscured by extragalactic and secondary signals; ACT takes advantage of multi-frequency data to separate out the primary CMB from late-time astrophysical emissions. At the same time, the Planck satellite has released measurements of large and intermediate scales, 2<l<2000, with unprecedented accuracy, providing a complementary dataset to ACT. In this talk I will describe the modeling of multi-frequency, multi-emissions data used to characterize both ACT and Planck measurements and how to extract cosmological informations from them.