Refreshed Shocks and Afterglow Longevity in Gamma-Ray Bursts

1997/12/18 by M. J. Rees, P. Mészáros, P. Meszaros · 8 citations
Earth and Planetary Sciences · Physics and Astronomy · #Cosmology and Gravitation Theories #Earth Systems and Cosmic Evolution #Gamma-ray bursts and supernovae #astro-ph

paper · pdf · doi:10.1086/311244

published as Astrophys.J. 496 (1998) L1 · subm to Ap.J. Letters, 12/18/97; latex (aaspp4), 9 pages, one postscript figure

arxiv created 1997/12/18 · openalex publication_date 1998/03/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31

Abstract

We consider fireball models where the ejecta have a range of bulk Lorentz factors, so that the inner (lower Γ) parts may carry most of the mass, or even most of the energy. The outer shock and contact discontinuity decelerate as the fireball sweeps up external matter. This deceleration allows slower ejecta to catch up, replenishing and reenergizing the reverse shock and boosting the momentum in the blast wave. In consequence, the energy available to power the afterglow may substantially exceed that of the burst itself. Such models allow a wide range of possibilities for the afterglow evolution, even in the case of spherically symmetric expansion.

Citations

• Optical and Long‐Wavelength Afterglow from Gamma‐Ray Bursts

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