First Results from QUIET: CMB Polarization Power Spectra by Maximum Likelihood Method

Details First Results from QUIET: CMB Polarization Power Spectra by Maximum Likelihood Method First Results from QUIET: CMB Polarization Power Spectra by Maximum Likelihood Method

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21820702d&link_type=abstract

American Astronomical Society, AAS Meeting #218, #207.02; Bulletin of the American Astronomical Society, Vol. 43, 2011

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The Q/U Imaging ExperimenT (QUIET) is a ground-based telescope located in the high Atacama Desert in Chile, and is designed to measure the polarization of the Cosmic Microwave Background (CMB) at Q and W frequency bands (43 and 95 GHz respectively) using coherent polarimeters. From 2008 October to 2010 December, data from more than 10,000 observing hours were collected, first with the Q-band receiver (2008 October to 2009 June) and then with the W-band receiver (until the end of the 2010 observing season).
The QUIET data analysis effort uses two independent pipelines, one consisting of a Pseudo-Cl framework and the other consisting of a maximum likelihood framework. Both pipelines employ blind analysis methods, and each provides analysis of the data using large suites of null tests specific to the pipeline. Analysis of the Q-band receiver data has recently been completed, confirming the only previous detection of the first acoustic peak of the EE power spectrum and setting competitive limits on the scalar-to-tensor ratio, r. In this thesis talk, I will discuss the Q-band analysis completed with the maximum likelihood pipeline, and present an update on the status of the W-band analysis.

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