Characterizing foreground for redshifted 21 cm radiation: 150 MHz Giant Metrewave Radio Telescope observations

Ghosh, Abhik ; Prasad, Jayanti ; Bharadwaj, Somnath ; Ali, Sk. Saiyad ; Chengalur, Jayaram N. (2012) Characterizing foreground for redshifted 21 cm radiation: 150 MHz Giant Metrewave Radio Telescope observations Monthly Notices of the Royal Astronomical Society, 426 (4). pp. 3295-3314. ISSN 00358711

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Official URL: http://doi.org/10.1111/j.1365-2966.2012.21889.x

Related URL: http://dx.doi.org/10.1111/j.1365-2966.2012.21889.x

Abstract

Foreground removal is a major challenge for detecting the redshifted 21 cm neutral hydrogen (H I) signal from the Epoch of Reionization. We have used 150 MHz Giant Metrewave Radio Telescope observations to characterize the statistical properties of the foregrounds in four different fields of view. The measured multifrequency angular power spectrum Cℓ(Δν) is found to have values in the range 104–2 × 104 mK2 across 700 ≤ ℓ ≤ 2 × 104 and Δν ≤ 2.5 MHz, which is consistent with model predictions where point sources are the most dominant foreground component. The measured Cℓ(Δν) does not show a smooth Δν dependence, which poses a severe difficulty for foreground removal using polynomial fitting.

Item Type:Article
Source:Copyright of this article belongs to The Royal Astronomical Society.
Keywords:Techniques: Interferometric; Diffuse Radiation; Radio Continuum: General.
ID Code:116349
Deposited On:09 Apr 2021 04:49
Last Modified:09 Apr 2021 04:49

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