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

Abstract

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

Citation Formats

Geng, J. J., Huang, Y. F., Dai, Z. G., Wu, X. F., and Li, Liang, E-mail: hyf@nju.edu.cn, E-mail: dzg@nju.edu.cn, E-mail: xfwu@pmo.ac.cn. Revisiting the emission from relativistic blast waves in a density-jump medium. United States: N. p., 2014. Web. doi:10.1088/0004-637X/792/1/31.
Geng, J. J., Huang, Y. F., Dai, Z. G., Wu, X. F., & Li, Liang, E-mail: hyf@nju.edu.cn, E-mail: dzg@nju.edu.cn, E-mail: xfwu@pmo.ac.cn. Revisiting the emission from relativistic blast waves in a density-jump medium. United States. doi:10.1088/0004-637X/792/1/31.
Geng, J. J., Huang, Y. F., Dai, Z. G., Wu, X. F., and Li, Liang, E-mail: hyf@nju.edu.cn, E-mail: dzg@nju.edu.cn, E-mail: xfwu@pmo.ac.cn. Mon . "Revisiting the emission from relativistic blast waves in a density-jump medium". United States. doi:10.1088/0004-637X/792/1/31.
@article{osti_22365215,
title = {Revisiting the emission from relativistic blast waves in a density-jump medium},
author = {Geng, J. J. and Huang, Y. F. and Dai, Z. G. and Wu, X. F. and Li, Liang, E-mail: hyf@nju.edu.cn, E-mail: dzg@nju.edu.cn, E-mail: xfwu@pmo.ac.cn},
abstractNote = {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.},
doi = {10.1088/0004-637X/792/1/31},
journal = {Astrophysical Journal},
number = 1,
volume = 792,
place = {United States},
year = {Mon Sep 01 00:00:00 EDT 2014},
month = {Mon Sep 01 00:00:00 EDT 2014}
}