Dynamic Monte Carlo simulations of radiatively accelerated GRB fireballs.
In: Monthly Notices of the Royal Astronomical Society, Jg. 476 (2018-05-15), Heft 2, S. 2352-2365
Online
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Zugriff:
We present a novel Dynamic Monte Carlo code (DynaMo code) that self-consistently simulates the Compton-scattering-driven dynamic evolution of a plasma. We use the DynaMo code to investigate the time-dependent expansion and acceleration of dissipationless gamma-ray burst fireballs by varying their initial opacities and baryonic content. We study the opacity and energy density evolution of an initially optically thick, radiation-dominated fireball across its entire phase space - in particular during the Rph < Rsat regime. Our results reveal new phases of fireball evolution: a transition phase with a radial extent of several orders of magnitude - the fireball transitions from Γ ∝ R to Γ ∝ R0, a post-photospheric acceleration phase - where fireballs accelerate beyond the photosphere and a Thomson-dominated acceleration phase - characterized by slow acceleration of optically thick, matter-dominated fireballs due to Thomson scattering. We quantify the new phases by providing analytical expressions of Lorentz factor evolution, which will be useful for deriving jet parameters. [ABSTRACT FROM AUTHOR]
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Dynamic Monte Carlo simulations of radiatively accelerated GRB fireballs.
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Autor/in / Beteiligte Person: | Chhotray, Atul ; Lazzati, Davide |
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Zeitschrift: | Monthly Notices of the Royal Astronomical Society, Jg. 476 (2018-05-15), Heft 2, S. 2352-2365 |
Veröffentlichung: | 2018 |
Medientyp: | academicJournal |
ISSN: | 0035-8711 (print) |
DOI: | 10.1093/mnras/sty286 |
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