supernova remnant


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supernova remnant

(SNR) The expanding shell of gas from a supernova explosion, consisting of the supernova ejecta and ‘swept-up’ interstellar gas. Young (< 1000 year old) supernova remnants are generally optically faint but are fairly strong radio and X-ray sources; the Crab nebula is exceptionally bright because it is energized by a central pulsar. Older supernova remnants appear as rings of bright filaments, again with associated radio and X-ray emission. Supernova remnants that have been observed at sufficiently high resolution can be loosely classified into two types. In shell SNRs, which constitute about 90% of all SNRs (including Tycho and Kepler), most of the observed radiation comes from a filamentary, often spherical shell; they seem to have no central power source and their luminosity is exclusively derived from the interaction of the supernova shell with the external medium. Plerions (or filled or filled-center SNRs) are now widely thought to be powered by a central pulsar – the Crab nebula is the archetypal example – and the observed radiation originates from the whole of the remnant. Compression by an expanding supernova remnant can trigger star formation in interstellar clouds. See also emission nebula.

supernova remnant

[¦sü·pər′nō·və ′rem·nənt]
(astronomy)
A nebula consisting of an expanding shell of gas that has been ejected by a supernova. Abbreviated SNR.
References in periodicals archive ?
NASA's Chandra X-ray space telescope has captured the stunning evolution of a supernova remnant. Through an accompanying video, NASA showed the spectacular images of the stellar explosion as it changed through the years.
September's strip of planetary nebulae and a poignant supernova remnant. I always find it remarkable that the two most famous and prominent planetary nebulae, along with two other notable planetaries, are all located within a surprisingly small strip of the heavens.
Other discoveries in the Milky Way detailed in the special edition include the sharpest image yet of a gamma ray source -- a nearby supernova remnant -- which will enable researchers to study this object at finer scale than before -- and three new 'gamma ray shells' that are possibly examples of a new type of supernova remnant.
One image shows a supernova remnant, the structure resulting from the explosion of a star in a supernova, and the Triangulum Galaxy, which is approximately three million light years from Earth.
They investigated the possibility that the rock drawing is the record of the supernova HB9 and found that only one Supernova remnant HB9 meets all the criteria and it exploded around 4500 BC with a brightness comparable to the brightness of the Moon.
As pointed out in previous studies, this orientation is about 50 degrees away from the direction expected if the pulsar was moving away from the center of the supernova remnant in a straight line.
Washington, April 11 ( ANI ): Researchers have identified a supernova remnant - known as G352.7-0.1 (or, G352 for short) - that has swept material, equivalent to about 45 times the mass of the Sun.
This is significant because another study already has shown that a so-called Type la supernova caused the Kepler supernova remnant.
This Supernova remnant will probably need a six-inch scope, unless you have a very dark observing site.
Last year scientists at the Space Telescope Science Institute, in Baltimore, found a supernova remnant in a group of stars.
Looking at a supernova remnant in Cygnus in the summer--it's like a very faint veil of gas.
However, he did detect it emerging from the Crab nebula and also from another supernova remnant in the constellation of Scorpio.