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Impulsive and Varying Injection in Gamma-Ray Burst Afterglows
The Astrophysical Journal
|June 1, 2000
Summary
The refreshed shock scenario in gamma-ray bursts (GRBs) offers new insights. A reverse shock component extends re-energization, potentially shifting the spectral peak to longer wavelengths.
Area of Science:
- Astrophysics
- High-energy astrophysics
Background:
- The standard model for gamma-ray burst (GRB) afterglows relies on synchrotron radiation from blast waves interacting with the interstellar medium.
- The refreshed shock scenario proposes that slower ejecta re-energizes decelerating ejecta, impacting afterglow emission.
Purpose of the Study:
- To reanalyze the refreshed shock scenario in GRBs.
- To investigate the implications of continuous or episodic re-energization on afterglow properties.
Main Methods:
- Reanalysis of the refreshed shock scenario in GRB afterglows.
- Theoretical modeling of ejecta-medium interaction and shock dynamics.
Main Results:
- Identified an additional reverse shock component contributing to ejecta re-energization, persisting for days.
- Observed that the spectral peak shifts to the reverse shock's characteristic frequency during re-energization.
- Demonstrated that continuous re-energization leads to different dynamics and slower flux decline compared to constant energy evolution.
Conclusions:
- The refreshed shock scenario provides a more comprehensive explanation for GRB afterglows.
- A continuously refreshed scenario predicts a spectral maximum in the far-infrared or millimeter range after several days, serving as a testable prediction.