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* In the Crab Nebula, another supernova remnant, Chandra showed a never-before-seen ring around the central pulsar and jets that had only been partially seen by earlier telescopes.
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Crab and Nebula
Its remnants form the Crab Nebula.
The Crab Nebula video by NASA
The supernova that created the Crab Nebula, the SN 1054, was observed by Arabic and Chinese astronomers in 1054.
One of the best examples of this is the Crab Nebula, in Taurus.
The compact object that was created after the explosion lies in the center of the Crab Nebula and is a neutron star.
Image: Crab Nebula. jpg | The Crab Nebula, an example of a supernova remnant.
* Supernova remnant ( e. g., Crab Nebula )
* Crab Nebula
The SN 1054 supernova, which gave birth to the Crab Nebula, was also observed by Chinese and Islamic astronomers.
The Crab Nebula, the shattered remnants of a star which exploded as a supernova, the light of which reached Earth in 1054 AD
* 1054: a large supernova is observed by astronomers, the remnants of which would form the Crab Nebula.
* John Bevis observes the Crab Nebula for the first time.
* Chinese astronomers observe a supernova in the Crab Nebula
Its remnants form the Crab Nebula ( NGC 1952 ).
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.
This effect was observed for light from the Crab Nebula by Martin, Illing and Angel.
On July 21, 1964, the Crab Nebula supernova remnant was discovered to be a hard X-ray ( 15 – 60 keV ) source by a scintillation counter flown on a balloon launched from Palestine, Texas, USA.
The Crab Nebula is a remnant of an exploded star.
This image shows the Crab Nebula in various energy bands, including a hard X-ray image from the HEFT data taken during its 2005 observation run.
The instrument performed within specification and observed Tau X-1, the Crab Nebula.
In the Crab Nebula X-ray spectrum there are three features that differ greatly from Scorpius X-1: its spectrum is much harder, its source diameter is in light-years ( ly ) s, not astronomical units ( AU ), and its radio and optical synchrotron emission are strong.
However, the Crab Nebula appears as an X-ray source that is a central freely expanding ball of dilute plasma, where the energy content is 100 times the total energy content of the large visible and radio portion, obtained from the unknown source.
Crab and another
Levinger, Bauer and Kane were part of another group, Noggins, in 1972 that only lasted for one album, Crab Tunes.
Beyond the dam, Byrd Creek absorbs Threemile Creek, which flows from the west, and continues eastward for another before emptying into Daddys Creek ( a tributary of the Obed River ) near Crab Orchard.
Crab and supernova
A giant Hubble Space Telescope | Hubble mosaic of the Crab Nebula, a supernova remnant
A well known example of such a nebula is the Crab Nebula, left over from a supernova that was observed in China and North America in 1054.
The Crab Nebula ( catalogue designations M1, NGC 1952, Taurus A ) is a supernova remnant and pulsar wind nebula in the constellation of Taurus.
The creation of the Crab Nebula corresponds to the bright SN 1054 supernova that was independently recorded by Indian, Arabic, Chinese and Japanese astronomers in 1054 AD.
Recent analysis of historical records have found that the supernova that created the Crab Nebula probably appeared in April or early May, rising to its maximum brightness of between apparent magnitude − 7 and − 4. 5 ( brighter than everything in the night sky except the Moon ) by July.
Thanks to the recorded observations of Far Eastern and Middle Eastern astronomers of 1054, Crab Nebula became the first astronomical object recognized as being connected to a supernova explosion.
However, the discovery of a pulsating radio source in the centre of the Crab Nebula was strong evidence that pulsars were formed by supernova explosions.
The presence of a pulsar in the Crab means that it must have formed in a core-collapse supernova ; Type Ia supernovae do not produce pulsars.
Theoretical models of supernova explosions suggest that the star that exploded to produce the Crab Nebula must have had a mass of between 9 and 11 M < sub >☉</ sub >.
Stars with masses lower than 8 solar masses are thought to be too small to produce supernova explosions, and end their lives by producing a planetary nebula instead, while a star heavier than 12 solar masses would have produced a nebula with a different chemical composition to that observed in the Crab.
The predominant theory to account for the missing mass of the Crab is that a substantial proportion of the mass of the progenitor was carried away before the supernova explosion in a fast stellar wind, a phenomenon commonly seen in Wolf-Rayet stars.
In the British television programme Doctor Who, The Master says in the serial Colony in Space that the Crab Nebula was the result of the Uxariean race testing the Doomsday Weapon, which is capable of making stars go supernova.
* Data on the Crab Nebula, on a supernova remnants catalogue managed at University of Cambridge
* He associates initially the Star of Bethlehem with the AD 1140 (± 20 ) supernova ( now Crab Nebula ) and the Crucifixion Eclipse with the total solar eclipse of AD 1170 (± 20 ).
In the course of further research he came to the conclusion that Crab Nebula supernova could not have exploded in AD 1054, but probably in AD 1153.
Crab and remnant
Discovered in 1968, the Crab pulsar was the first to be connected with a supernova remnant.
The star is the central star in the Crab Nebula, a remnant of the supernova SN 1054, which was widely observed on Earth in the year 1054.
This is in contrast to the Crab pulsar, known to be the remnant of the SN 1054 supernova in the year 1054, which has lost two-thirds of its rotational energy in essentially the same time span.
* Crab Nebula, the supernova remnant found in the constellation Taurus
The Crab Nebula is a remnant of an exploded star.
The remnant of SN 1054, which consists of debris ejected during the explosion, is known as the Crab Nebula.
Some of the remnant of the explosion formed a pulsar, called the Crab Pulsar ( or PSR B0531 + 21 ).
If we centre the research on the star ζ Tauri, there is a remnant located in the immediate proximity: the Crab Nebula.
The Crab Nebula is the only object which presents the expected characteristics of a young remnant and is therefore considered to the product of the explosion which was observed in 1054.
However, this “ South-East ” direction has long left modern astronomers perplexed in the context of this event: the logical remnant of the supernova corresponding to the guest star is the Crab Nebula, but it is not situated to the southeast of ζ Tauri, rather in the opposite direction, to the northwest.
If all the available elements strongly suggest that the star of 1054 was a supernova, and that in the area next to where the star was seen, there is a remnant of a supernova which has all of the characteristics expected of an object that is around 1000 years old, a major problem arises: the new star is described as being to the South-East of Tianguan, while the Crab Nebula is to the North-East.
In 1972 for example, Ho Peng Yoke and his colleagues suggested that the Crab Nebula was not the product of the explosion of 1054, but that the true remnant was to the South-East, as indicated in several Chinese sources.
Its remnant, the Crab Nebula, was one of the first to be discovered in 1731 by John Bevis.
The discovery of the Crab pulsar, and the knowledge of its exact age ( almost to the day ) allows for the verification of basic physical properties of these objects, such as characteristic age and spin-down luminosity, the orders of magnitude involved ( notably the strength of the magnetic field ), along with various aspects related to the dynamics of the remnant.
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