Foreground simulation and power spectrum estimation for 610 MHz GMRT observations
Abstract
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 diffuse emission at 610MHz for GMRT. We estimate power spectrum of the diffuse emission using two visibility-correlation function. We find that visibility-correlation estimator is consistent with the input power-spectrum which we have used to simulate Galactic diffuse emission.
- Publication:
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Astronomical Society of India Conference Series
- Pub Date:
- 2014
- Bibcode:
- 2014ASInC..13..315C
- Keywords:
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- cosmology: large scale structure of universe;
- cosmology: diffuse radiation