Foreground simulation and power spectrum estimation for 610 MHz GMRT observations

Samir Choudhuri1, Somnath Bharadwaj1 and Sk. Saiyad Ali2
1Department of Physics and Meteorology & Centre for Theoretical Studies, IIT Kharagpur, 721302, India
2Department of Physics, Jadavpur University, Kolkata 700032, India

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Foreground removal is a biggest challenge for a statistical detection of the redshifted 21cm HI signal. They have strength 4-5 order magnitude larger than the faint HI signal. We simulate UV coverage and Galactic di use emission at 610MHz for GMRT. We estimate power spectrum of the di use emission using two visibility-correlation function. We find that visibility-correlation estimator is consistent with the input powerspectrum which we have used to simulate Galactic di use emission.

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Keywords : cosmology: large scale structure of universe, cosmology: diffuse radiation