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Supernova remnant in the Milky Way From Wikipedia, the free encyclopedia
G299.2-2.9 is a supernova remnant in the Milky Way, 16,000 light years from Earth.[1] It is the remains of a Type Ia supernova.[2] The observed radius of the remnant shell translates to approximately 4,500 years of expansion,[3] making it one of the oldest observed Type Ia supernova remnants.[4]
 Shell structure of G299.2-2.9 | |
| Event type | Supernova remnant  |
|---|---|
| SN Ia | |
| Constellation | Musca |
| Epoch | J2000 |
| Distance | 16,000 ly |
| Remnant | Mixed Morphology |
| Host | Milky Way |
| Notable features | Complex outer shell structure |
| Other designations | SNR G299.2-02.9 |
 Related media on Commons | |
G299.2-2.9 gives astronomers an opportunity to study how supernova remnants evolve and warp over time. G299.2-2.9 also provides a glimpse of the explosion that produced it. G299.2-2.9 is split into several distinct and different regions: an almost complete bubble interrupted only by a blow-out, a bright center, a complex "knot" region on the northeastern edge of the bubble structure and a diffuse emission extending beyond the main structure.[5] It has been heavily documented by multiple satellites and in-orbit telescopes, including the Hubble Space Telescope, Spitzer Telescope,[6] and Chandra.[7]
The small X-ray emission from the deep portions of G299.2-2.9 shows large quantities of iron and silicon,[8] which indicates that it is a remnant of a Type Ia supernova. The outer "shell" is large and complex, with a multi-shell structure. Outer shells similar to G299.2-2.9 are usually not associated with exploded stars.[9] Since theories about Type Ia supernovae assume they go off in a specified environment, detailed studies of the outer "shell" of G299.2-2.9 have helped astronomers[10] improve their understanding of the areas and situations where thermonuclear explosions occur.[11]
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