Statistics – Computation
Scientific paper
Sep 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010phdt.........3l&link_type=abstract
PhDT Dissertations of the University of Groningen
Statistics
Computation
Scientific paper
One of the most exciting applications of LOFAR will be the search for redshifted 21-cm line emission from the Epoch of Reionization (EOR). It is currently believed that the Dark Ages, the period after recombination when the Universe turned neutral, lasted until around the Universe was 400,000 years old. During the EOR, objects started to form in the early Universe and they were energetic enough to ionize neutral hydrogen. The most prominent method to unravel the string leading to this epoch is the-21-cm line of neutral hydrogen the most abundant element in the Universe. Due to the expansion of the Universe, this line is redshifted to the low regime of the radio spectrum with wavelengths of the order of a few meters. The sensitivity required to achieve this scientific goal, essentially translates into accumulating large amounts of data. Furthermore, the data have to be corrected for instrumental and atmospheric distortions to an unprecedented level. This thesis examines the relationship between the sky signal and the observed data and discusses a statistically optimal solution for the processing of LOFAR data that is also computationally efficient.
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