Askap j1839-0756’s impression, a neutron star that emits rays of radio waves from its magnetic poles
James josephides
About 13,000 light years away, a collapsed star is so unusual that researchers finding it say that it should not exist.
It was first discovered by Askap Radio Telescope in Western Australia in January 2024 and is likely to be a type of pulsar that has never been seen before.
When supermasive stars reach the end of their lives and explode in supernova, the remains create a super-shattered object called Neutron Star. Pulsar are neutrons stars that rotate rapidly, emit radio waves from their magnetic poles while walking. Most Pulsars revolve at a speed of more than a revolution per second and whenever a radio ray points towards us, we get a pulse at the same frequency.
But in recent years, astronomers have started finding compact items that emit radio waves at a very slow pace. This has surprised scientists, who thought that the radio wave shine should stop when the rotation for each spin slows over a minute.
These slow moving objects are known as long -term radio transient. Last year, a team led Manisha Kaleb At the University of Sydney, Australia, announced a transient discovery with a period of 54 minutes.
Now, Kaleb and his colleagues say that a new item he got a year ago, named Askap J1839-0756, is moving at a new record of 6.45 hours per round.
This is also the first transient that is discovered with interples: a weak pulse in the middle of the main pulse coming from the opposite magnetic pole.
First, the team thought that Askap J1839-0756 could be a white dwarf, a small star like our sun that has died. “But we have never seen a separate white dwarf by emitting radio pulse and our calculation shows that it is very large to be a different white dwarf, based on the qualities of the pulse,” says. Joshua LeeMember of a team at Sydney University.
Subsequently, the team thought that it could be a magnetor, a nutron star with a huge magnetic field – which is 10 trillion times more powerful than the strongest MRI machines on Earth.
A magnetor with a 6.67-hour rotating period has been found earlier, but, so far, it has only emitted X-rays, not radio waves.
Kaleb says that if the star is a separate magnetor, this will be the first to be emitted with such a slow period in the radio wave frequency.
Says Kaleb, “This new object is completely re -writing what we thought we thought we knew about the radio emission mechanism from the last 60 years of neutron stars.” “It is definitely one of the most strange objects in recent times, because we did not think that these things existed. But now we are looking for them. If it is a magnetor, it is definitely unique among the neutron star population.
She says that the idea needs to be reconsidered that when the Pulsar moves very slowly, they stop emitting radio waves.
“We have been seeing objects in recent years that are seen crossing this death line, but they are still emitting in radio (frequency),” says Caleb. “So they are like zombie stars where you don’t expect them to be alive, but they are still alive, and are going away.”
Subject:
(Tagstootransite) astronomy
