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G299.2-2.9
Supernova remnant in the Milky Way From Wikipedia, the free encyclopedia
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G299.2-2.9 is a supernova remnant in the Milky Way, 16,000 light years from Earth.[2] It is the remains of a Type Ia supernova.[3] The observed radius of the remnant shell translates to approximately 4,500 years of expansion,[4] making it one of the oldest observed Type Ia supernova remnants.[5]
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Description
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.[6] It has been heavily documented by multiple satellites and in-orbit telescopes, including the Hubble Space Telescope, Spitzer Telescope,[7] and Chandra.[8]
The small X-ray emission from the deep portions of G299.2-2.9 shows large quantities of iron and silicon,[9] 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.[10] 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[11] improve their understanding of the areas and situations where thermonuclear explosions occur.[12]
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Gallery
Composite image using X-ray light from Chandra (orange) that has been overlaid on an infrared image from 2MASS.[13]
Red, green and blue represent low, medium and high-energy X-rays – Chandra.[13]
Chandra X-ray Observatory – NASA.[13]
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References
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