Mathematics – Logic
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21914308l&link_type=abstract
American Astronomical Society, AAS Meeting #219, #143.08
Mathematics
Logic
Scientific paper
Making measurements of the highly-redshifted 21cm hyperfine transition of hydrogen is a potentially powerful way to constrain the Epoch of Reionization and the preceding Dark Ages. While experiments have traditionally focused on tomographic measurements, recently there has been a growing interest in measuring the global, angularly-averaged signal. Instruments used for the latter purpose have traditionally lacked angular resolution, and consist of (for instance) a single dipole. The lack of angular resolution can make foreground subtraction difficult, and we show that with better angular resolution, one can obtain global 21cm spectra with much smaller error bars. We also show that by incorporating some knowledge about the rough shape of the expected spectra, one can greatly increase the statistical significance with which cosmological signatures can be detected.
Liu Adrian
Loeb Abraham
Pritchard Jonathan R.
Tegmark Max
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