3D MHD modeling of the expanding remnant of SN 1987A : role of magnetic field and non-thermal radio emission
| Autor: | Marco Miceli, Shigehiro Nagataki, Petar Mimica, Fabrizio Bocchino, Shiu-Hang Lee, Miguel-Ángel Aloy, Giovanni Peres, Massimiliano Guarrasi, Masaomi Ono, Salvatore Orlando, Oleh Petruk |
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| Přispěvatelé: | ITA, ESP, JPN, POL, UKR, Orlando, S., Miceli, M., Petruk, O., Ono, M., Nagataki, S., Aloy, M.A., Mimica, P., Lee, S.-H., Bocchino, F., Peres, G., Guarrasi, M. |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Shock wave
H II region Magnetohydrodynamics (MHD) shock wave Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Field strength ISM [radio continuum] Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences magnetohydrodynamics (MHD) Radio spectrum individual: SN 1987A [supernovae] 0103 physical sciences ISM [X-rays] 010303 astronomy & astrophysics Blast wave ISM: supernova remnant Astrophysics::Galaxy Astrophysics Physics High Energy Astrophysical Phenomena (astro-ph.HE) Nebula supernovae: individual: SN 1987A 010308 nuclear & particles physics supernova remnants [ISM] Astronomy and Astrophysics shock waves X-rays: ISM Magnetic field radio continuum: ISM Space and Planetary Science Magnetohydrodynamics Astrophysics - High Energy Astrophysical Phenomena |
| Popis: | Aims. We investigate the role played by a pre-supernova (SN) ambient magnetic field on the dynamics of the expanding remnant of SN 1987A and the origin and evolution of the radio emission from the remnant, in particular, during the interaction of the blast wave with the nebula surrounding the SN. Methods. We model the evolution of SN 1987A from the breakout of the shock wave at the stellar surface to the expansion of its remnant through the surrounding nebula by 3D MHD simulations. The model considers the radiative cooling, the deviations from equilibrium of ionization, the deviation from temperature-equilibration between electrons and ions, and a plausible configuration of the pre-SN ambient magnetic field. From the simulations, we synthesize both thermal X-ray and non-thermal radio emission and compare the model results with observations. Results. The presence of an ambient magnetic field reduces the erosion and fragmentation of the dense equatorial ring after the impact of the SN blast wave. As a result, the ring survives the passage of the blast, at least, during the time covered by the simulations (40 years). Our model is able to reproduce the morphology and lightcurves of SN 1987A in both X-ray and radio bands. The model reproduces the observed radio emission if the flux originating from the reverse shock is heavily suppressed. In this case, the radio emission originates mostly from the forward shock traveling through the H II region. Possible mechanisms for the suppression of emission from the reverse shock are investigated. We find that synchrotron self-absorption and free-free absorption have negligible effects on the emission during the interaction with the nebula. We suggest that the emission from the reverse shock at radio frequencies might be limited by highly magnetized ejecta. 15 pages, 9 Figures, accepted for publication on A&A, high quality figures will be available on the published paper |
| Databáze: | OpenAIRE |
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