Tech UPTechnologyThey find a neutron star that shouldn't exist

They find a neutron star that shouldn't exist

About 24,000 light-years from Earth , in the constellation Cassiopeia, astronomers have found a dead star that shouldn’t exist. That, according to current theory. The discovered neutron star is spewing out jets of matter, something that was believed not to happen.

The problem is that it also has a strong magnetic field. And jets of matter have only been observed in neutron stars with magnetic fields 1,000 times weaker. Hence our current understanding of how this event works just doesn’t work. You cannot explain this rare discovery.

Black holes are denser than neutron stars, famous for their gravity so powerful that not even light can reach escape velocity. Although they are not as impressive as black holes, neutron stars also have a powerful gravitational field, which means that they can accumulate matter from other objects in their influence.

This is the case of the neutron star protagonist of the study published in the journal Nature. It is part of a binary system called Swift J0243.6 + 6124 , discovered in October 2017 by the Swift Observatory, in which material from the star is absorbed by the neutron star.

Jets are well known in the universe: powerful streams of radiation and particles that erupt at almost the speed of light from the poles of accretion objects. We do not yet know what drives these jets, but it is believed that they could be limited by powerful magnetic fields.

However, Swift J0243.6 + 6124 appeared.

The researchers, led by astronomer Jakob van den Eijnden from the University of Amsterdam in the Netherlands, observed radio emissions from the system, in addition to the X-ray emission detected by Swift that led to the discovery.

After making more observations and analyzing the data, they concluded that the radio emissions were consistent with jets of matter from sources like black holes, but interestingly 100 times fainter than jets from other neutron stars.

“For the first time, we have observed a jet from a neutron star with a strong magnetic field,” explains Van den Eijnden. And not just any strong magnetic field. The magnetic field around the neutron star Swift J0243.6 + 6124 is 10 trillion times stronger than that of the Sun.

This disproves the magnetic field theory of suppressing jets quite clearly, and demands a reexamination of how they are produced and released, the authors said.

Previously, it had been thought that neutron star jets were channeled from the magnetic field on the inner side of the accretion disk, and if the neutron star’s magnetic field was strong enough, it would prevent the accretion disk from getting closer. enough to activate the squirting.

Except this new discovery puts that theory right in the trash can.

Previously, it had been thought that neutron star jets were channeled from the magnetic field on the inner side of the accretion disk, and if the neutron star’s magnetic field was strong enough, it would prevent the accretion disk from getting closer. enough to activate the squirting.

Except this new discovery puts that theory right in the trash can.

It could be that, in some cases, the rotational energy of the neutron star could be extracted to power the jets, Miller-Jones noted; this could explain why the jets were so faint compared to other neutron stars.

“Whatever the explanation, our result is a great example of how science works, with theories being developed, tested against observations, and revised in light of new experimental results,” he wrote.

Reference: An evolving jet from a strongly magnetized accreting X-ray pulsar, Nature (2018). DOI: 10.1038 / s41586-018-0524-1, https://www.nature.com/articles/s41586-018-0524-1

Image credit: ICRAR / University of Amsterdam.

Slaves and Disabled: Forced Medical Test Volunteers

The main problem to carry out medical research is to have willing volunteers for it. And if they come out for free, much better. This is the story of unethical behavior in medical research.

How are lightning created?

Summer is synonymous with sun, but also with storms. Who has not contemplated one from the protection that the home gives that electrical display that is lightning?

How global warming will affect astronomy

Astronomical observations around the world will worsen in quality as a result of climate change, according to a new study.

New images of Saturn's rings in stunning detail

New images of Saturn's rings in stunning detail

NASA discovers more than 50 areas that emit exorbitant levels of greenhouse gases

NASA's 'EMIT' spectrometer locates has targeted Central Asia, the Middle East and the US among others.

More