• Fisher Matrix-based Predictions for Measuring the z = 3.35 Binned 21-cm Power Spectrum using the Ooty Wide Field Array (OWFA)

• # Fulltext

https://www.ias.ac.in/article/fulltext/joaa/038/01/0014

• # Keywords

Cosmology: large scale structure of the Universe; intergalactic medium; diffuse radiation.

• # 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 $326.5 {\rm MHZ}$. 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 $5 \sigma$ detection of the binned power spectrum is possible in the $k$ range $0.05 \leq k \leq 0.3 \, {\rm Mpc}^{-1}$ with $1000$ hours of observation. We find that the signal- to-noise ratio (${\rm SNR}$) peaks in the $k$ range $0.1- 0.2\, {\rm Mpc}^{-1}$ where a $10 \sigma$ 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 (${\rm SNR}$) 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.

• # Author Affiliations

1. Centre for Theoretical Studies, India Institute of Technology Kharagpur, Kharagpur 721 302, India.
2. Department of Physics, India Institute of Technology Kharagpur, Kharagpur 721 302, India.
3. Department of Physics, Jadavpur University, Kolkata 700 032, India.

• # Journal of Astrophysics and Astronomy

Current Issue
Volume 40 | Issue 4
August 2019

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