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

Somnath Bharadwaj1¹  Sk. Saiyad Ali²  Anjan Kumar Sarkar1¹ 

[1] Centre for Theoretical Studies, India Institute of Technology Kharagpur, Kharagpur 721 302, India.$$;Department of Physics, Jadavpur University, Kolkata 700 032, India.$$

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

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

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 $326.5 {m MHZ}$. 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 $0.05 leq kleq 0.3 , {m Mpc}^{-1}$ with $1000$ hours of observation. We find that the signal- to-noise ratio (${m SNR}$) peaks in the $k$ range $0.1- 0.2, {m Mpc}^{-1}$ 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 (${m SNR}$) 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.

【 授权许可】

Unknown