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Title: Early GRB Afterglows from Reverse Shocks in Ultra-relativistic, Long-lasting Winds

Abstract

We develop a model of early Gamma-Ray Burst (GRB) afterglows with dominant X-ray contribution from the reverse shock (RS) propagating in highly relativistic (Lorentz factor γw ~ 106) magnetized wind of a long-lasting central engine. The model reproduces, in a fairly natural way, the overall trends and yet allows for variations in the temporal and spectral evolution of early optical and X-ray afterglows. The high energy and the optical synchrotron emission from the RS particles occurs in the fast cooling regime; the resulting synchrotron power Ls is a large fraction of the wind luminosity, Ls ≈ Lw/$$ \sqrt{1 + σ_w}$$ (Lw and σw are wind power and magnetization). Thus, plateaus—parts of afterglow light curves that show slowly decreasing spectral power—are a natural consequence of the RS emission. Contribution from the forward shock (FS) is negligible in the X-rays, but in the optical both FS and RS contribute similarly: FS optical emission is in the slow cooling regime, producing smooth components, while RS optical emission is in the fast cooling regime, and thus can both produce optical plateaus and account for fast optical variability correlated with the X-rays, e.g., due to changes in the wind properties. We discuss how the RS emission in the X-rays and combined FS and RS emission in the optical can explain many puzzling properties of early GRB afterglows.

Authors:
ORCiD logo [1];  [2]
  1. Purdue Univ., West Lafayette, IN (United States)
  2. Purdue Univ., West Lafayette, IN (United States); Univ. Nacional de Colombia, Bogota (Columbia)
Publication Date:
Research Org.:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1537174
Grant/Contract Number:  
SC0016369
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 835; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Astronomy & Astrophysics

Citation Formats

Lyutikov, Maxim, and Jaramillo, Juan Camilo. Early GRB Afterglows from Reverse Shocks in Ultra-relativistic, Long-lasting Winds. United States: N. p., 2017. Web. https://doi.org/10.3847/1538-4357/835/2/206.
Lyutikov, Maxim, & Jaramillo, Juan Camilo. Early GRB Afterglows from Reverse Shocks in Ultra-relativistic, Long-lasting Winds. United States. https://doi.org/10.3847/1538-4357/835/2/206
Lyutikov, Maxim, and Jaramillo, Juan Camilo. Tue . "Early GRB Afterglows from Reverse Shocks in Ultra-relativistic, Long-lasting Winds". United States. https://doi.org/10.3847/1538-4357/835/2/206. https://www.osti.gov/servlets/purl/1537174.
@article{osti_1537174,
title = {Early GRB Afterglows from Reverse Shocks in Ultra-relativistic, Long-lasting Winds},
author = {Lyutikov, Maxim and Jaramillo, Juan Camilo},
abstractNote = {We develop a model of early Gamma-Ray Burst (GRB) afterglows with dominant X-ray contribution from the reverse shock (RS) propagating in highly relativistic (Lorentz factor γw ~ 106) magnetized wind of a long-lasting central engine. The model reproduces, in a fairly natural way, the overall trends and yet allows for variations in the temporal and spectral evolution of early optical and X-ray afterglows. The high energy and the optical synchrotron emission from the RS particles occurs in the fast cooling regime; the resulting synchrotron power Ls is a large fraction of the wind luminosity, Ls ≈ Lw/$ \sqrt{1 + σ_w}$ (Lw and σw are wind power and magnetization). Thus, plateaus—parts of afterglow light curves that show slowly decreasing spectral power—are a natural consequence of the RS emission. Contribution from the forward shock (FS) is negligible in the X-rays, but in the optical both FS and RS contribute similarly: FS optical emission is in the slow cooling regime, producing smooth components, while RS optical emission is in the fast cooling regime, and thus can both produce optical plateaus and account for fast optical variability correlated with the X-rays, e.g., due to changes in the wind properties. We discuss how the RS emission in the X-rays and combined FS and RS emission in the optical can explain many puzzling properties of early GRB afterglows.},
doi = {10.3847/1538-4357/835/2/206},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 835,
place = {United States},
year = {2017},
month = {1}
}

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