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Cosmology Large Angular Scale Surveyor

San Pedro de Atacama, Italy

Cosmology Large Angular Scale Surveyor

The Cosmology Large Angular Scale Surveyor (CLASS) is an array of microwave telescopes which has been observing since 2016 from a high-altitude site in the Atacama Desert of Chile as part of the Parque Astronómico de Atacama. The CLASS experiment aims to improve our understanding of cosmic dawn when

the first stars turned on and to test the theory of cosmic inflation by making precise measurements of the polarization of the Cosmic Microwave Background (CMB) over 65% of the sky at multiple frequencies in the microwave region of the electromagnetic spectrum. To date, CLASS has produced maps of a majority of the sky at frequencies of 40 and 90 GHz (7.5 mm and 3.3 mm wavelength, respectively), constraints on circular polarization in the CMB, a detection of circular polarization from the atmosphere, and measurements of the disk-averaged microwave brightness temperature of Venus.

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