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Title: Revisiting the emission from relativistic blast waves in a density-jump medium

Re-brightening bumps are frequently observed in gamma-ray burst afterglows. Many scenarios have been proposed to interpret the origin of these bumps, of which a blast wave encountering a density-jump in the circumburst environment has been questioned by recent works. We develop a set of differential equations to calculate the relativistic outflow encountering the density-jump by extending the work of Huang et al. This approach is a semi-analytic method and is very convenient. Our results show that late high-amplitude bumps cannot be produced under common conditions, rather only a short plateau may emerge even when the encounter occurs at an early time (<10{sup 4} s). In general, our results disfavor the density-jump origin for those observed bumps, which is consistent with the conclusion drawn from full hydrodynamics studies. The bumps thus should be caused by other scenarios.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. School of Astronomy and Space Science, Nanjing University, Nanjing 210093 (China)
  2. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China)
  3. Department of Physics, Stockholm University, AlbaNova, SE-106 91 Stockholm (Sweden)
Publication Date:
OSTI Identifier:
22365215
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 792; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AFTERGLOW; AMPLITUDES; COSMIC GAMMA BURSTS; DENSITY; DIFFERENTIAL EQUATIONS; EMISSION; EXPLOSIONS; HYDRODYNAMICS; ORIGIN; RELATIVISTIC RANGE; SHOCK WAVES