Radio polarization maps of shell-type SNRs II. Sedov models with evolution of turbulent magnetic field
| Autor: | Marco Miceli, Rino Bandiera, Oleh Petruk, Salvatore Orlando, V. Beshley |
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| Přispěvatelé: | ITA, UKR, Petruk, O., Bandiera, R., Beshley, V., Orlando, S., Miceli, M. |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Shock wave
Radiation mechanisms: non-thermal Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Cosmic ray Astrophysics 01 natural sciences symbols.namesake 0103 physical sciences Faraday effect Stokes parameters 010306 general physics 010303 astronomy & astrophysics ISM: supernova remnant Astrophysics::Galaxy Astrophysics Physics High Energy Astrophysical Phenomena (astro-ph.HE) Astronomy and Astrophysics Astronomy and Astrophysic Dissipation Acceleration of particle Polarization (waves) Magnetic field Supernova Space and Planetary Science symbols Astrophysics - High Energy Astrophysical Phenomena |
| Popis: | Polarized radio emission has been mapped with great detail in several Galactic supernova remnants (SNRs), but has not yet been exploited to the extent it deserves. We have developed a method to model maps of the Stokes parameters for shell-like SNRs during their Sedov evolution phase. At first, 3-dimensional structure of a SNR has been computed, by modeling the distribution of the magnetohydrodynamic parameters and of the accelerated particles. The generation and dissipation of the turbulent component of magnetic field everywhere in SNR are also considered taking into account its interaction with accelerated particles. Then, in order to model the emission, we have used a generalization of the classical synchrotron theory, valid for the case in which the magnetic field has ordered and disordered components. Finally, 2-dimensional projected maps have been derived, for different orientations of SNR and of interstellar magnetic field with respect to the observer. An important effect to consider is the Faraday rotation of the polarization planes inside the SNR interior. In this paper we present details of the model, and describe general properties of the images. accepted in MNRAS |
| Databáze: | OpenAIRE |
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