Redshifted 21 cm HI signal from post-reionization era: 326.5 MHz ORT experiments

Sk. Saiyad Ali1* and Somnath Bharadwaj2
1Department of Physics, Jadavpur University, Kolkata 700032, India
2Department of Physics and Meteorology & Centre for Theoretical Studies, IIT Kharagpur, 721302, India

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Observations of the redshifted 21 cm HI fluctuations promise to be an important probe of the post-reionization era. Here we predict the expected SNR for the upgraded Ooty Radio Telescope (ORT) which operates at frequency 326.5MHz (z = 3:35). Assuming that the visibilities contain only the HI signal and system noise, we show that a 3σ detection of the HI signal (~ 1mK) is possible at angular scales 110 to 3° with ≈ 1000 hours of observation.

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