The Atacama Cosmology Telescope: Map-making and Maps

Details The Atacama Cosmology Telescope: Map-making and Maps The Atacama Cosmology Telescope: Map-making and Maps

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21538402s&link_type=abstract

American Astronomical Society, AAS Meeting #215, #384.02; Bulletin of the American Astronomical Society, Vol. 42, p.598

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The Atacama Cosmology Telescope (ACT) is a 6 meter telescope observing the Cosmic Microwave Background from northern Chile. It has 3,000 bolometers taking data at 400 Hz, for a raw data rate of 200 GB/night. To get the most out of the ACT data, we make iterative maps from months to years of data. Processing such large amounts of data, in the presence of both non-white detector noise and non-white noise correlated between detectors (such as from the atmosphere), reduces to solving an enormous linear least squares problem. This is a formidable computational challenge - we typically solve for many tens of billions of parameters from trillions of data points using thousands of cores. We discuss the challenges in dealing with such large quantities of data, and present initial maps made from ACT data.

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