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

Lyutikov, Maxim; Jaramillo, Juan Camilo

doi:10.3847/1538-4357/835/2/206

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

Journal Article · Tue Jan 31 00:00:00 EST 2017 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/835/2/206· OSTI ID:1537174

^[1]; Jaramillo, Juan Camilo ^[2]

Purdue Univ., West Lafayette, IN (United States)
Purdue Univ., West Lafayette, IN (United States); Univ. Nacional de Colombia, Bogota (Columbia)

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 γ_w ~ 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 L_s is a large fraction of the wind luminosity, L_s ≈ L_w/$$ \sqrt{1 + σ_w}$$ (L_w and σ_w 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.

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Research Organization:: Purdue Univ., West Lafayette, IN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0016369

OSTI ID:: 1537174

Journal Information:: The Astrophysical Journal (Online), Vol. 835, Issue 2; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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