The Chandra high-resolution spatial and spectral picture of SNR 1E0102.2-7219
Abstract
The oxygen-rich SNR 1E0102.2-7219 in the SMC was observed with the Chandra HETGS in September, 1999 and December, 2002. The high-resolution X-ray spectrum reveals Doppler shifts on the order of 1000 km/s, suggesting an expanding ringlike structure inclined to the line of sight. A two-dimensional Doppler map shows a distinct separation of redshifted and blueshifted regions, for which three-dimensional models with cylindrical symmetry are under investigation. The ring-like images of the dispersed spectrum provide evidence for plasma inhomogeneities, suggesting azimuthal variations in temperature and an increase in electron temperature with radius. Variations in the radii of these ring images are compatible with an interpretation of progressive ionization due to passage of the reverse shock through the ejecta. Ratios of individual emission lines provide ionization and temperature constraints on the plasma, and allow us to estimate the mass of the oxygen ejecta to be ∼6 M⊙, consistent with a massive progenitor. This work was supported by NASA through contract NAS8-01129 and by the Smithsonian Astrophysical Observatory (SAO) contract SVI-61010 for the Chandra X-Ray Center (CXC).
- Publication:
-
35th COSPAR Scientific Assembly
- Pub Date:
- 2004
- Bibcode:
- 2004cosp...35.3143F