Ghosh, Abhik ; Bharadwaj, Somnath ; Ali, Sk. Saiyad ; Chengalur, Jayaram N. (2010) GMRT observation towards detecting the post-reionization 21-cm signal Monthly Notices of the Royal Astronomical Society, 411 (4). pp. 2426-2438. ISSN 0035-8711
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Official URL: http://doi.org/10.1111/j.1365-2966.2010.17853.x
Related URL: http://dx.doi.org/10.1111/j.1365-2966.2010.17853.x
Abstract
The redshifted 21-cm signal from neutral hydrogen (H I) is an important future probe of the high-redshift Universe. We have analysed 610 MHz Giant Metrewave Radio Telescope (GMRT) observations towards detecting this signal from z= 1.32. The multi-frequency angular power spectrum Cℓ(Δν) is used to characterize the statistical properties of the background radiation across angular scales ∼20 arcsec to 10 arcmin, and a frequency bandwidth of 7.5 MHz with resolution 125 kHz. The measured Cℓ(Δν) which ranges from 7 to 18 mK2 is dominated by foregrounds, the expected H I signal CHIℓ (Δν) ∼ 10−6 to 10−7 mK2 is several orders of magnitude smaller and detecting this is a big challenge.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to The Royal Astronomical Society. |
| Keywords: | Cosmology: Observations; Diffuse Radiation; Large-Scale Structure Of Universe. |
| ID Code: | 116356 |
| Deposited On: | 09 Apr 2021 04:51 |
| Last Modified: | 09 Apr 2021 04:51 |
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