Searching For Cosmic Reionization With The Hi 21cm Signal

Details Searching For Cosmic Reionization With The Hi 21cm Signal Searching For Cosmic Reionization With The Hi 21cm Signal

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21532502d&link_type=abstract

American Astronomical Society, AAS Meeting #215, #325.02; Bulletin of the American Astronomical Society, Vol. 42, p.421

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Scientific paper

One of the most difficult challenges for the detection of the HI 21cm signal during cosmological reionization is the accuracy of the foreground source removal. We show that bright sources (<1 Jy) need to be removed from observations of the Murchison Widefield Array (MWA) with a positional accuracy of approximately 0.1 arc-second. This is less than 1% of the synthesized array beam. We also demonstrate that foreground subtraction can only tolerate a residual calibration error of 0.2% in amplitude per UV cell, assuming that individual visibility errors average down over consecutive days. We present power spectra of simulated residual foreground subtraction with position and calibration errors. This thesis also includes a search for the HI 21cm absorption towards z 5 radio loud objects to search for residual neutral HI from reionization.

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