Sarkar, Anjan Kumar ; Bharadwaj, Somnath ; Ali, Sk. Saiyad (2017) Fisher Matrix-based Predictions for Measuring the z = 3.35 Binned 21-cm Power Spectrum using the Ooty Wide Field Array (OWFA) Journal of Astrophysics and Astronomy, 38 (1). ISSN 0250-6335
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Official URL: http://doi.org/10.1007/s12036-017-9432-2
Related URL: http://dx.doi.org/10.1007/s12036-017-9432-2
Abstract
We use the Fisher matrix formalism to predict the prospects of measuring the redshifted 21-cm power spectrum in different k-bins using observations with the upcoming Ooty Wide Field Array (OWFA) which will operate at 326.5 MHz. This corresponds to neutral hydrogen (HI) at z = 3.35, and a measurement of the 21-cm power spectrum provides a unique method to probe the large-scale structures at this redshift. Our analysis indicates that a 5σ detection of the binned power spectrum is possible in the k range 0.05 ≤ k ≤ 0.3 Mpc−1 with 1000 hours of observation. We find that the signal- to-noise ratio (SNR) peaks in the k range 0.1−0.2 Mpc−1 where a 10σ detection is possible with 2000 hours of observations. Our analysis also indicates that it is not very advantageous to observe beyond 1000 h in a single field-of-view as the SNR increases rather slowly beyond this in many of the small k-bins. The entire analysis reported here assumes that the foregrounds have been completely removed.
Item Type: | Article |
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Source: | Copyright of this article belongs to Indian Academy of Sciences, Bengaluru. |
Keywords: | Cosmology: Large Scale Structure Of The Universe; Intergalactic Medium; Diffuse Radiation. |
ID Code: | 116296 |
Deposited On: | 09 Apr 2021 04:28 |
Last Modified: | 09 Apr 2021 04:28 |
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