At a speed of more than 2.2 million kilometers per hour, Scientists have identified one of the fastest cosmic objects in the Milky Way galaxy.galaxy entirely. The stars have just been measured by data from the Chandra X-ray Observatory: a type of pulsating neutron star known as a "pulsar" that rips its path at about 612 kilometers per second.
This object is among the fastest objects. It is considered to be discovered of this type. The fastest known star in the Milky Way is not an exploding supernova remnant, but a star orbiting the supermassive black hole at the center of the galaxy, Sgr A*. This object moves at an incredible speed of 24,000 kilometers per second at the fastest point of its orbit.
Xi Long, an astrophysicist at the Harvard-Smithsonian Center for Astrophysics (CfA), said: "We directly observed the motion of the pulsar in We saw an X-ray, and this was only possible with Chandra's very sharp vision. Because this object is too far to see the movement, we had to consider the equivalent of the width of a coin, which is about 24 km. 20,000 light years away from us. Previous observations had shown a high-speed pulsar in it, but Long and his colleagues wanted to study this object to reveal the history of the supernova by tracing back its movement towards the center.
"Daniel Patnaude" ) astrophysicist at the Harvard-Smithsonian Center for Astrophysics, said: "We only have a handful of supernova explosions for which reliable historical histories have been identified, so we wanted to see if G292.0+1.8 could be added to the collection."
Supernova remnant G292.0+1.8
They studied images of the supernova remnant taken in 2006 and 2016 and used data from the Gaia spacecraft about its current location in the Milky Way. They compared the differences in the pulsar position. These comparisons revealed something very interesting: the dead star appears to be moving 30% faster than previously estimated.
This means that the journey of the star's core from the center of the supernova remnant took place in a much shorter time. It shows that the supernova explosion itself happened recently. Previous estimates showed the date of this supernova to be about 3,000 years ago, but the new estimates put this date at about 2,000 years ago.
This revised measurement of the pulsar speed also led to a new and detailed investigation of how it was launched. The dead star from the center of the supernova contributed to the current position. They proposed two scenarios, both of which involve a similar mechanism.
In the first case, neutrinos are ejected asymmetric from the supernova explosion, and in the other, the debris from the explosion includes this asymmetric ejection. However, because the neutrino energy must be so high, a more likely explanation is that the debris from the explosion was asymmetric. . This state has caused the star to move at an impressive speed of 550 km/s, which is higher than the escape velocity of the central disk of the Milky Way. However, it takes a long time to reach this region and the star's motion may slow down over time.
On the other hand, the actual speed of this pulsar may be even higher than 612 km/s, because it is slightly along the Our line of sight moves. Paul Plucinsky, another collaborator of this research, said: "This pulsar is about 200 million times more energetic than the movement of the Earth around the Sun, and it seems that it received such a powerful impact only because of the asymmetric explosion of the supernova." p>
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Cover photo: A runaway pulsar in the supernova remnant G292.0 +
Credit:X -ray: NASA/CXC/SAO/L. Xi et al.; Optical: Palomar DSS2
Source: Science Alert