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          Institute: MPI für Kernphysik     Collection: Theoretical Astrophysics     Display Documents



  history
ID: 521912.0, MPI für Kernphysik / Theoretical Astrophysics
Computation of Synthetic Spectra from Simulations of Relativistic Shocks
Authors:Reville, Brian; Kirk, John G.
Language:English
Date of Publication (YYYY-MM-DD):2010-12
Title of Journal:The Astrophysical Journal
Journal Abbrev.:ApJ
Volume:724
Issue / Number:2
Start Page:1283
End Page:1295
Review Status:not specified
Audience:Experts Only
Abstract / Description:Particle-in-cell (PIC) simulations of relativistic shocks are in principle capable of predicting the spectra of photons that are radiated incoherently by the accelerated particles. The most direct method evaluates the spectrum using the fields given by the Liénard-Wiechart potentials. However, for relativistic particles this procedure is computationally expensive. Here we present an alternative method that uses the concept of the photon formation length. The algorithm is suitable for evaluating spectra both from particles moving in a specific realization of a turbulent electromagnetic field or from trajectories given as a finite, discrete time series by a PIC simulation. The main advantage of the method is that it identifies the intrinsic spectral features and filters out those that are artifacts of the limited time resolution and finite duration of input trajectories.
Free Keywords:gamma-ray burst: general, methods: numerical, radiation mechanisms: general, relativistic processes
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group of W. Hofmann/ Theoretical Astrophysics (J. Kirk)
Identifiers:DOI:http://dx.doi.org/10.1088/0004-637X/724/2/1283
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