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Late-Time Radio Re-Brightening of Gamma-Ray Burst Afterglows: Evidence for Double-Sided Jets | | Zhuo Li
; Li-Ming Song
; | | Date: |
31 Jul 2004 | | Journal: | Astrophys.J. 614 (2004) L17 | | Subject: | astro-ph | | Abstract: | The central engine of gamma-ray bursts (GRBs) is believed to eject double-sided ultra-relativistic jets. For an observed GRB, one of the twin jets should point toward us, and is responsible for the prompt gamma-ray and subsequent afterglow emission. We consider in this Letter the other receding jet, which will give rise to late-time radio re-brightening (RRB) when it becomes non-relativistic (NR) and radiative isotropic. The RRB peaks at a time $5t_{NR}=2(E_{j,51}/n)^{1/3}$ yr after the GRB, where $t_{NR}$ is the observed NR timescale for the preceding jet, $E_j$ is the jet energy and $n$ is the ambient medium density. The peak flux is comparable to the preceding-jet emission at $t_{NR}$. We expect the RRB of GRB 030329 1.7 yr after the burst with a flux $sim0.6$ mJy at 15 GHz. The cases of GRBs 970508 and 980703 have also been discussed. The detection of RRB, which needs dense monitoring campaign even a few years after a GRB, will be the direct evidence for the existence of double-sided jets in GRBs, and prove the black hole-disk system formation in the cores of progenitors. | | Source: | arXiv, astro-ph/0408009 | | Other source: | [GID 164772] astro-ph/0408009 | | Services: | Forum | Review | PDF | Favorites | |
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