The nature of the X-ray halo of the plerion G21.5–0.9 unveiled by XMM-Newton and Chandra

F. Bocchino, E. van der Swaluw, R. Chevalier, R. Bandiera
2005 Astronomy and Astrophysics  
The nature of the radio-quiet X-ray halo around the plerionic SNR G21.5-0.9 is under debate. On the basis of spatial and spectral analysis of a large Chandra and XMM-Newton dataset of this source, we have developed a self-consistent scenario which explains all the observational features. We found that the halo is composed by diffuse extended emission due to dust scattering of X-rays from the plerion, by a bright limb which traces particle acceleration in the fast forward shock of the remnant,
more » ... d by a bright spot (the "North Spur") which may be a knot of ejecta in adiabatic expansion. By applying a model of interaction between the PWN, the SNR and supernova environment, we argue that G21.5-0.9 progenitor may be of Type IIP or Ib/Ic, and that the remnant may be young (200-1000 yr).
doi:10.1051/0004-6361:20052870 fatcat:hgenps2cdfg6xpjqywb6anpdci