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Physics & Astronomy Seminar: Learning Around Galactic Foregrounds

September 18, 2020 @ 2:30 pm

Samuel Gagnon-Hartman,
Bishop’s University

The highly-redshifted 21 cm neutral hydrogen emission line is widely accepted as a potent probe of the early universe, particularly the Epoch of Reionization. This cosmological signal is obfuscated by intragalactic sources, which are 10^5 times brighter than the desired signal. It has been demonstrated that these galactic foregrounds are confined to a particular region of cylindrical Fourier space dubbed « the wedge ». Various techniques have been proposed to recover the lost cosmological information within the wedge by closely modelling the Milky Way’s radio footprint. I demonstrate that after simply deleting all information within the wedge, a Convolutional Neural Network may be trained to recover the lost cosmological information by exploiting the non-Gaussianity of the cosmological signal.

If you are interested in joining in this seminar, please contact Jean Porter at to obtain the zoom link.


Date :
September 18, 2020
Heure :
2:30 pm
Catégorie d’évènement:




Physics Department
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