Hydrodynamic effects in internal shock of relativistic outflows

Motoki Kino, Akira Mizuta, Shoichi Yamada

    Research output: Contribution to journalArticle

    19 Citations (Scopus)

    Abstract

    We study both analytically and numerically hydrodynamic effects of two colliding shells, the simplified models of internal shock in various relativistic outflows such as gamma-ray bursts and blazars. We pay particular attention to three interesting cases: a pair of shells with the same rest-mass density ("equal rest-mass density"), a pair of shells with the same rest mass ("equal mass"), and a pair of shells with the same bulk kinetic energy ("equal energy") measured in the interstellar medium frame. We find that the density profiles are significantly affected by the propagation of rarefaction waves. A split feature appears at the contact discontinuity of two shells for the equal-mass case, while no significant split appears for the equal-energy and equal rest-mass density cases. The shell spreading within a few 10% of the speed of light is also shown as a notable aspect caused by rarefaction waves. The conversion efficiency of bulk kinetic energy to internal energy is numerically evaluated. The time evolutions of the efficiency show deviations from the widely used inelastic two-point mass-collision model.

    Original languageEnglish
    Pages (from-to)1021-1032
    Number of pages12
    JournalAstrophysical Journal
    Volume611
    Issue number2 I
    DOIs
    Publication statusPublished - 2004 Aug 20

    Fingerprint

    outflow
    hydrodynamics
    shock
    shell
    elastic waves
    kinetic energy
    energy
    blazars
    effect
    internal energy
    gamma ray bursts
    discontinuity
    collision
    deviation
    collisions
    propagation
    profiles

    Keywords

    • Galaxies: jets
    • Gamma rays: bursts
    • Gamma rays: theory
    • Radiation mechanisms: nonthermal
    • Shock waves

    ASJC Scopus subject areas

    • Space and Planetary Science

    Cite this

    Hydrodynamic effects in internal shock of relativistic outflows. / Kino, Motoki; Mizuta, Akira; Yamada, Shoichi.

    In: Astrophysical Journal, Vol. 611, No. 2 I, 20.08.2004, p. 1021-1032.

    Research output: Contribution to journalArticle

    Kino, Motoki ; Mizuta, Akira ; Yamada, Shoichi. / Hydrodynamic effects in internal shock of relativistic outflows. In: Astrophysical Journal. 2004 ; Vol. 611, No. 2 I. pp. 1021-1032.
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