Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-08-25
Astrophys.J. 619 (2005) 684-696
Astronomy and Astrophysics
Astrophysics
36 pages, 12 figures, 1 table, accepted for publication in ApJ
Scientific paper
10.1086/426785
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.
Ioka Kunihito
Meszaros Peter
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