A supernova remnant (SNR) is the structure resulting from the explosion of a star in a supernova. The supernova remnant is bounded by an expanding shock wave, and consists of ejected material expanding from the explosion, and the interstellar material it sweeps up and shocks along the way.
There are two common routes to a supernova: either a massive star may run out of fuel, ceasing to generate fusion energy in its core, and collapsing inward under the force of its own gravity to form a neutron star or a black hole; or a white dwarf star may accrete material from a companion star until it reaches a critical mass and undergoes a thermonuclear explosion.
In either case, the resulting supernova explosion expels much or all of the stellar material with velocities as much as 10% the speed of light (or approximately 30,000 km/s). These speeds are highly supersonic, so a strong shock wave forms ahead of the ejecta. That heats the upstream plasma up to temperatures well above millions of K. The shock continuously slows down over time as it sweeps up the ambient medium, but it can expand over hundreds or thousands of years and over tens of parsecs before its speed falls below the local sound speed.
One of the best observed young supernova remnants was formed by SN 1987A, a supernova in the Large Magellanic Cloud that was observed in February 1987. Other well-known supernova remnants include the Crab Nebula; Tycho, the remnant of SN 1572, named after Tycho Brahe who recorded the brightness of its original explosion; and Kepler, the remnant of SN 1604, named after Johannes Kepler. The youngest known remnant in the Milky Way is G1.9+0.3, discovered in the Galactic Center.[1]
^Discovery of most recent supernova in our galaxy May 14, 2008
A supernovaremnant (SNR) is the structure resulting from the explosion of a star in a supernova. The supernovaremnant is bounded by an expanding shock...
The Vela supernovaremnant is a supernovaremnant in the southern constellation Vela. Its source Type II supernova exploded approximately 11,000 years...
This is a list of observed supernovaremnants (SNRs) in the Milky Way, as well as galaxies nearby enough to resolve individual nebulae, such as the Large...
immutable heavens. The remnant of this supernova was identified in 1941 at the Mount Wilson Observatory. The true nature of the supernova remained obscure for...
was Kepler's Supernova in 1604, appearing not long after Tycho's Supernova in 1572, both of which were visible to the naked eye. The remnants of more recent...
November 1572 and was independently discovered by many individuals. Its supernovaremnant has been observed optically but was first detected at radio wavelengths...
Ia supernova leaves no compact remnant, but the whole mass of the former white dwarf dissipates through space. The theory of this type of supernova is...
from the remnant. No associated neutron star or black hole has been found, which is the situation expected for the remnant of a Type Ia supernova (a class...
shell of gas forms a supernovaremnant, a special diffuse nebula. Although much of the optical and X-ray emission from supernovaremnants originates from ionized...
supernovaremnant The light echo of Supernova 1987A History of supernova observation List of supernovae List of supernovaremnants List of supernova candidates...
Cassiopeia A (Cas A) (listen) is a supernovaremnant (SNR) in the constellation Cassiopeia and the brightest extrasolar radio source in the sky at frequencies...
suggested to report a supernova. Since 1976 several SNR in the relatively crowded field have been suggested as counterpart: These remnants are valid suggestions...
environments left over by supernova explosions: Supernovaremnants. The origin of the cosmic rays was attributed to supernovas by Baade and Zwicky; this...
may be an evolved H II region. It contains the 11,000-year-old Vela SupernovaRemnant, along with the Vela Pulsar. The Gum Nebula contains about 32 cometary...
A type Iax supernova is a rare subtype of type Ia supernova, which leaves behind a remnant star, known as zombie star, rather than completely dispersing...
"full"), is a type of nebula sometimes found inside the shell of a supernovaremnant (SNR), powered by winds generated by a central pulsar. These nebulae...
Tarantula Nebula. There is a prominent supernovaremnant enclosing the open cluster NGC 2060, but the remnants of many other supernovae are difficult...
gamma-emitting pulsar associated with the Vela SupernovaRemnant in the constellation of Vela. Its parent Type II supernova exploded approximately 11,000–12,300...
succeeding year it disappeared. The gaseous shell RCW 86 is probably the supernovaremnant of this event and has a relatively large angular size of roughly 45...
3C 58 or 3C58 is a pulsar (designation PSR J0205+6449) and supernovaremnant (pulsar wind nebula) within the Milky Way. The object is listed as No. 58...
2002bj and SN 1939B. The supernova occurred 16″ from the relatively bright nucleus of the galaxy. This made detection of its remnant difficult — early attempts...
plausible conventional supernovaremnant in the old historical area for the supernova was the supernovaremnant 3C 58. This remnant has a radio and X-ray...
of the star, the remnants of the core form a neutron star or a black hole. Because of the underlying mechanism, the resulting supernova is also described...
J195509+261406. On September 1, 2014, ESA released news of a magnetar close to supernovaremnant Kesteven 79. Astronomers from Europe and China discovered this magnetar...
of the galaxy. The radio source consists of three components: the supernovaremnant Sagittarius A East, the spiral structure Sagittarius A West, and a...
Network studied a number of potential supernova remnants in the galaxy in the 1980s and 90s. One supernovaremnant displayed clear expansion between 1986 and...
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