First Results from an XMM-Newton LP on SN1006
Abstract
We present first results from our XMM-Newton large project on SN1006 with total effective exposure times of 683, 710, and 439ks from MOS-1, MOS-2, and PN. We conduct spatially resolved spectroscopy analysis to map out the physical parameters of this closest and least absorbed historical SNR. High-resolution (comparable to the original narrow band images with a pixel size of 3.2") equivalent width (EW) maps are obtained for OVII, OVIII, MgXI, MgXII, SiXIII, SiXIV, SXV, and in particular, Fe L-shell emission lines, using our new continuum fitting method. Many filamentary structures are clearly resolved on EW maps (which are not seen on the original images), consistent with results from numerical hydrodynamic simulations, likely representing the development of hydrodynamic instabilities between the shocked ejecta and the shocked ISM. Lower-resolution (with adaptive mesh) maps of other spectral analysis parameters, such as the temperature of thermal plasma, power law index of synchrotron emission, electron density, ionization timescale, and metal abundances, are also constructed. To study the particle acceleration processes, we extract broad-band spectra from radio to X-ray from a set of small regions along some nonthermal filaments at the forward shock. We then study the azimuthal variation (along these filaments) of the synchrotron spectral index and cut-off frequency, as well as the width of the filaments. The azimuthal dependence of these parameters provides strong constraints on the acceleration mechanism. We conclude that the particle acceleration efficiency is strongly dependent on the obliquity angle between the shock velocity and the upstream magnetic field.
- Publication:
-
AAS/High Energy Astrophysics Division #13
- Pub Date:
- April 2013
- Bibcode:
- 2013HEAD...1312708L