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An interpretation of the overionized plasma in supernova remnant W49B

  • Xin Zhou (a1) (a2) (a3), Marco Miceli (a4) (a5), Fabrizio Bocchino (a5), Salvatore Orlando (a5), Yang Chen (a3) (a6), Li Ji (a1) and Ji Yang (a1)...

Abstract

W49B is a mixed-morphology supernova remnant (SNR) with the presence of enhanced abundances and overionization confirmed by X-ray observation. For the overionization, a strong radiative recombination continuum (RRC) has been detected and confirmed by SUZAKU and XMM-Newton. Here, we investigate these intriguing observational results through a multidimensional hydrodynamic model that takes into account, for the first time, the mixing of ejecta with the circumstellar and interstellar medium, thermal conduction, and non-equilibrium ionization. The model can reproduce the morphology and the overionization pattern of W49B. We found that the overionized plasma originates from the rapid cooling of the hot plasma originally heated by the shock reflected from the dense ring-like cloud. In addition, based on the most updated ATOMDB (v2.0.2), we calculated the spectrum of one cell in the overionized region from the simulation results at present. We got the overionized spectrum that is in agreement with the observational results. Thus, our primary result indicates that the model is consistent with the observations both spatially and spectrally.

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References

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Keohane, J. W., Reach, W. T., Rho, J., & Jarrett, T. H. 2007, ApJ, 654, 938
Miceli, M., Bocchino, F., Decourchelle, A., Ballet, J., & Reale, F. 2010, A&A, 514, L2
Miceli, M., Decourchelle, A., Ballet, J., Bocchino, F., Hughes, J. P., Hwang, U., & Petre, R. 2006, A&A, 453, 567
Rho, J. & Petre, R. 1998, ApJ, 503, L167
Ozawa, M., Koyama, K., Yamaguchi, H., Masai, K., & Tamagawa, T. 2009, ApJ, 706, L71
Zhou, X., Miceli, M., Bocchino, F., Orlando, S., & Chen, Y. 2011, MNRAS, 415, 244
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Keywords

An interpretation of the overionized plasma in supernova remnant W49B

  • Xin Zhou (a1) (a2) (a3), Marco Miceli (a4) (a5), Fabrizio Bocchino (a5), Salvatore Orlando (a5), Yang Chen (a3) (a6), Li Ji (a1) and Ji Yang (a1)...

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