UCB Astro seminar
From theoretical promise to observational reality: calibration and foreground subtraction in 21cm tomography
Adrian Liu (MIT)
* What are the fundamental physics that 21cm can probe?
21cm maps distribution of neutral hydrogen using the redshifted hyperfine transition. 21cm tomography has the potential to probe epoch of reionization, the preceding Dark Ages, and fundamental physics at unprecedented levels of accuracy. Expected signal is of the order of 10mK, where the foregrounds are expected to be 100 to 1000K. 21cm requires exquisitely well-calibrated radio interferometer array, as well as data processing algorithms that are capable of high precision foreground subtraction. Discuss existing proposals for 21cm calibration and FG subtraction; differences between 21cm tomography and traditional radio astronomy, CMB or galaxy surveys. Redundant calibration, principal component models or FG spectra, and systematic, unbiased framework for FG subtraction necessary.
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