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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2023

Studying the Multi-frequency Angular Power Spectrum of the Cosmic Dawn 21-cm Signal

Résumé

The light-cone (LC) anisotropy arises due to cosmic evolution of the cosmic dawn 21-cm signal along the line-of-sight (LoS) axis of the observation volume. The LC effect makes the signal statistically non-ergodic along the LoS axis. The multi-frequency angular power spectrum (MAPS) provides an unbiased alternative to the popular 3D power spectrum as it does not assume statistical ergodicity along every direction in the signal volume. Unlike the 3D power spectrum, MAPS captures the cosmological evolution of the intergalactic medium. Here we first study the impact of different underlying physical processes during cosmic dawn on the behaviour of the 21-cm MAPS using simulations of various different scenarios and models. We also make error predictions in 21-cm MAPS measurements considering only the system noise and cosmic variance for mock observations of HERA, NenuFAR and SKA-Low. We find that $100~{\rm h}$ of HERA observations will be able to measure 21-cm MAPS at $\geq 3\sigma$ for $\ell \lesssim 1000$ with $0.1\,{\rm MHz}$ channel-width. The better sensitivity of SKA-Low allows reaching this sensitivity up to $\ell \lesssim 3000$. Considering NenuFAR, measurements $\geq 2\sigma$ are possible only for $\ell \lesssim 600$ with $0.2\,{\rm MHz}$ channel-width and for a ten times longer observation time of $t_{\rm obs} = 1000~{\rm h}$. However, for the range $300 \lesssim \ell \lesssim 600$ and $t_{\rm obs}=1000~{\rm h}$ more than $3\sigma$ measurements are still possible for NenuFAR when combining consecutive frequency channels within a $5 ~{\rm MHz}$ band.

Dates et versions

hal-03993910 , version 1 (17-02-2023)

Identifiants

Citer

Abinash Kumar Shaw, Raghunath Ghara, Saleem Zaroubi, Rajesh Mondal, Garrelt Mellema, et al.. Studying the Multi-frequency Angular Power Spectrum of the Cosmic Dawn 21-cm Signal. Monthly Notices of the Royal Astronomical Society, 2023, 522 (2), pp.2188-2206. ⟨10.1093/mnras/stad1114⟩. ⟨hal-03993910⟩
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