On the prospects of measuring the cosmic dawn 21-cm power spectrum using the upgraded Giant Metrewave Radio Telescope (uGMRT)
Apr 2, 20186 pages
Published in:
- Mon.Not.Roy.Astron.Soc. 483 (2019) 2, 2269-2274
- Published: Feb 21, 2019
e-Print:
- 1804.00515 [astro-ph.CO]
DOI:
- 10.1093/mnras/sty3242 (publication)
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Abstract: (Oxford University Press)
A recent observation by the Experiment to Detect the Global Epoch of Reionization Signature collaboration shows a strong absorption signal in the global 21-cm spectrum from around a redshift of z = 17. This absorption is stronger than the maximum prediction by existing models and indicates that the spatial fluctuations of the H i 21-cm brightness temperature at cosmic dawn could be an order of magnitude larger than previously expected. In this paper, we investigate the prospects of detecting the H i 21-cm power spectrum from cosmic dawn using uGMRT. We find that a 10σ detection of the enhanced H i 21-cm signal power spectrum is possible within 70, 140, and 400 h of observation for an optimistic, moderate, and pessimistic scenario, respectively, using the Band-1 of uGMRT. This could be a useful probe of the interaction between the baryon and dark matter particles in the early Universe. We also present a comparison of the uGMRT predictions with those for the future SKA-Low.Note:
- Accepted for publication in MNRAS
- techniques: interferometric
- cosmology: observations
- early Universe
- large-scale structure of Universe
References(34)
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