The Murchison Widefield Array (MWA): Exploring the Epoch of Reionization with the Redshifted 21 cm Line

Details The Murchison Widefield Array (MWA): Exploring the Epoch of Reionization with the Redshifted 21 cm Line The Murchison Widefield Array (MWA): Exploring the Epoch of Reionization with the Redshifted 21 cm Line

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21813206b&link_type=abstract

American Astronomical Society, AAS Meeting #218, #132.06; Bulletin of the American Astronomical Society, Vol. 43, 2011

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The 21 cm hyperfine transition line of neutral hydrogen should provide a direct probe of the Epoch of Reionization (EoR). Detecting redshifted 21 cm emission from neutral gas in the intergalactic medium (IGM) during the EoR is the primary science goal of the Murchsion Widefield Array (MWA). When completed, the MWA will be sensitive primarily to the power spectrum of spatial fluctuations in the 21 cm background between redshifts 6 < z < 12. Its observations should characterize the properties of the sources that are responsible for ionizing the IGM, chart the evolution of the global neutral fraction, and probe the nature of quasar emissions by constraining the properties of their ionized proximity zones.
Foreground subtraction is a critical challenge for redshifted 21 cm measurements. Developing the resources to successfully extract the 21 cm signal from Galactic and extragalactic foregrounds is a crucial objective for the MWA. We describe the foreground-removal techniques that are planned for use with the MWA, the metrics against which the success of foreground removal will be evaluated, and the requirements on overall array performance and calibration imposed by the EoR science goals.

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