Simulating the 21cm forest detectable with LOFAR and SKA in the spectra of high-z GRBs

Abstract

We investigate the feasibility of detecting 21cm absorption features in the afterglow spectra of high redshift long Gamma Ray Bursts (GRBs). This is done employing simulations of cosmic reionization, together with the instrumental characteristics of the LOw Frequency ARray (LOFAR). We find that absorption features could be marginally (with a S/N larger than a few) detected by LOFAR at z>7 if the GRB originated from PopIII stars, while the detection would be easier if the noise were reduced by one order of magnitude, i.e. similar to what is expected for the first phase of the Square Kilometer Array (SKA1-low). On the other hand, more standard GRBs are too dim to be detected even with ten times the sensitivity of SKA1-low, and only in the most optimistic case can a S/N larger than a few be reached at z>9.

5 pages, 4 figures, MNRAS, in press

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Cited by in corpus (17)

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• A search for faint high-redshift radio galaxy candidates at 150 MHz
• Gamma-ray bursts and Population III stars
• Detailed modelling of the 21-cm Forest
• 21 cm Forest Constraints on Primordial Black Holes
• The detectability of strong 21 centimetre forest absorbers from the diffuse intergalactic medium in late reionisation models
• The GLEAMing of the First Supermassive Black Holes
• Statistical Detection of IGM Structures during Cosmic Reionization using Absorption of the Redshifted 21 cm line by HI against Compact Background Radio Sources
• The Redshift Distribution of Infrared-Faint Radio Sources
• Observing the redshifted 21 cm signal around a bright QSO at $z\sim 10$
• Prospects of a statistical detection of the 21-cm forest and its potential to constrain the thermal state of the neutral IGM during reionization
• Cospatial 21 cm and metal-line absorbers in the epoch of reionization -- I : Incidence and observability
• Exploration of the high-redshift universe enabled by THESEUS
• Analytical modeling of the one-dimensional power spectrum of 21-cm forest based on a halo model method
• Lossless compression of simulated radio interferometric visibilities
• Efficient neutral-IGM inference from noisy 21-cm forest spectra with latent-space U-Net encoding and XGBoost