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Radio Afterglows of Gamma-Ray Bursts and Hypernovae at High Redshift, and their Potential for 21-cm Absorption Studies
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We investigate the radio afterglows of gamma-ray bursts (GRBs) and hypernovae (HNe) at high redshifts and quantify their detectability, as well as their potential usefulness for 21 cm absorption line studies of the intergalactic medium (IGM) and intervening structures. We examine several sets of source and environment model parameters that are physically plausible at high redshifts. The radio afterglows of GRBs would be detectable out to z ~ 30, while the energetic HNe could be detectable out to z ~ 20 even by the current Very Large Array (VLA). We find that the 21 cm absorption line due to the diffuse neutral IGM is difficult to detect even by the proposed Square Kilometer Array (SKA), except for highly energetic sources. We also find that the 21 cm line due to collapsed gas clouds with high optical depth may be detected on rare occasions.
Forward citations
Cited by 2 Pith papers
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Forest without Trees is still Fruitful: Constraints on the thermal state of the neutral IGM at $z\approx5.6$ with the 21-cm forest power spectrum
A null detection of the 21-cm forest toward quasar J352–15 at z≈5.8 disfavors very cold and substantially neutral intergalactic gas, giving the first observational constraints from a 21-cm forest power spectrum.
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Analytical modeling of the one-dimensional power spectrum of 21-cm forest based on a halo model method
A halo-model formula for the 1D power spectrum of the 21-cm forest is presented and shown to match small-scale simulations built from the same gas and temperature assumptions.
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