2008/11/07 by Andrei M. Bykov, A. M. Bykov, Yu. A. Uvarov +2 · 80 citations
Physics and Astronomy · #Astrophysics #Astrophysics and Cosmic Phenomena #Electron #Gamma-ray bursts and supernovae #Magnetic field #Nuclear physics #Optics #Physics #Solar and Space Plasma Dynamics #Supernova #Synchrotron #Synchrotron radiation #astro-ph
paper · pdf · doi:10.1086/595868
published in The Astrophysical Journal 689(2), L133-L136 (IOP Publishing) · ApJ Letters, in press
openalex publication_date 2008/11/07 · arxiv created 2008/11/15 · arxiv updated 2011/02/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Nonthermal X-ray emission in some supernova remnants originates from synchrotron radiation of ultrarelativistic particles in turbulent magnetic fields. We address the effect of a random magnetic field on synchrotron emission images and spectra. A random magnetic field is simulated to construct synchrotron emission maps of a source with a steady distribution of ultrarelativistic electrons. Nonsteady localized structures (dots, clumps, and filaments), in which the magnetic field reaches exceptionally high values, typically arise in the random field sample. These magnetic field concentrations dominate the synchrotron emission (integrated along the line of sight) from the highest energy electrons in the cutoff regime of the distribution, resulting in an evolving, intermittent, clumpy appearance. The simulated structures resemble those observed in X-ray images of some young supernova remnants. The lifetime of X-ray clumps can be short enough to be consistent with that observed even in the case of a steady particle distribution. The efficiency of synchrotron radiation from the cutoff regime in the electron spectrum is strongly enhanced in a turbulent field compared to emission from a uniform field of the same magnitude.