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      Permanent link:
      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

       

      Anjan Kumar Sarkar1 Somnath Bharadwaj1 2 Sk. Saiyad Ali3

      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.
    • Dates

       
  • Journal of Astrophysics and Astronomy | News

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