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Related Experiment Videos

A Shotgun Model for Gamma-Ray Bursts.

Heinz, Begelman

    The Astrophysical Journal
    |November 24, 1999
    PubMed
    Summary
    This summary is machine-generated.

    Gamma-ray bursts (GRBs) may originate from dense, relativistic "blobs" impacting circumstellar material. The resulting shockwaves produce gamma-ray emission, with burst duration linked to the central engine's lifetime.

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    Area of Science:

    • Astrophysics
    • High-energy astrophysics
    • Gamma-ray astronomy

    Background:

    • Gamma-ray bursts (GRBs) are intense, brief flashes of high-energy radiation.
    • The precise mechanisms generating GRBs remain a significant area of research.
    • Previous models have explored various progenitor systems and emission processes.

    Purpose of the Study:

    • To propose a novel model for the production of gamma-ray bursts (GRBs).
    • To explain the observed emission, variability, and duration of GRBs.
    • To establish the physical conditions required for GRB generation.

    Main Methods:

    • Theoretical modeling of relativistic astrophysical phenomena.
    • Analysis of shock dynamics in dense circumstellar media.

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  • Correlation of model parameters with observed GRB characteristics.

    • Main Results:

    • GRBs are proposed to result from a shower of heavy blobs impacting circumstellar material at relativistic speeds.
    • Gamma-ray emission is generated within the shocks created by these impacting blobs.
    • Short-term variability is attributed to bullet deceleration, while burst duration depends on the central engine's lifetime.

    Conclusions:

    • The proposed model requires a dense ambient medium, consistent with strong stellar winds.
    • This 'blob' impact model offers a plausible explanation for GRB production.
    • The model suggests potentially high efficiencies for GRB generation.