Model for Synchrotron Emission from Shell Supernova Remnants in Nonuniform Interstellar Med.pdf

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Model for Synchrotron Emission from Shell Supernova Remnants in Nonuniform Interstellar Med.pdf

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Model for Synchrotron Emission from Shell Supernova Remnants in Nonuniform Interstellar Med

a r X i v : a s t r o - p h / 0 2 0 6 4 8 4 v 1 2 7 J u n 2 0 0 2 Model for Synchrotron X-rays from Shell Supernova Remnants in Nonuniform Interstellar Medium and Nonuniform Magnetic Field O. Petruk Institute for Applied Problems in Mechanics and Mathematics, 3-b Naukova St., Lviv 79053, Ukraine petruk@astro.franko.lviv.ua Possibility to model the high energy synchrotron emission (in X- and γ-rays) from supernova remnants (SNRs) is an important task for modern astronomy and astrophysics, because it may be responsible for the nonthermal X-rays and TeV γ- rays observed recently from a number of SNRs. This emission allows as to look in the processes of particle acceleration on SNR shocks and generation of cosmic rays. In this paper, a model for the synchrotron emission from shell SNR in nonuniform interstellar medium and nonuniform magnetic field is presented. This model is a generalization of the model of Reynolds Chevalier developed for a spherical SNR in the uniform medium and uniform magnetic field. The model will be used for studies on the thermal and nonthermal X-ray images and spectra from nonspherical SNRs in different interstellar magnetic field configurations. Key words: interstellar medium, supernova remnants, hydrodynamics, shock wave, X-rays, synchrotron emission PACS 98.38.Mz, 95.30.Gv, 95.85.Nv 1 Introduction For the last few years, a considerable interest has grown in the investigation of the synchrotron X-ray emission from supernova remnants (SNRs), caused by electrons accelerated on SNR shocks up to the energy ～ 1013?14 eV. This emission process is believed to be responsible for the nonthermal X-ray (SN 1006, Cas A, Tycho, G347.3-0.5, IC443, G266.2-1.2, RCW86) and TeV γ-ray (SN 1006, Cas A, G347.3- 0.5) emission observed recently from a number of SNRs. Model for synchrotron X-rays from shell SNRs developed up to now [1, 2] works with uniform magnetic field and is based on the simple spherical Sedov model [3] for SNR hydrodynamics. The most essen