Scientists have found that three Neutron starsborn in the fires of other exploding stars, have cooled surprisingly quickly, bringing us closer to understanding the strange nature of the matter at the core of these intense objects.
The discovery was made by a Spanish team led by Alessio Marino of the Institute of Space Sciences (ICE–CSIC) in Barcelona, using European and American space telescopes that work with X-ray light.
A neutron star is the core collapse of a massive star that has died supernovaAnd it can be almost triple The mass of our sun in a spherical volume only about 6.8 miles (11 km) wide. All the material condensed into such a small area means that neutron stars are among the densest concentrations of matter in the known universe, second only to black holes. To make this statement more relevant, consider how a tablespoon of neutron star material is comparable to the mass of Mount Everest.
This extreme nature also means that the physics governing the interior of neutron stars remains dark. These objects were originally called neutron stars because their matter is so fragmented that they have a negative charge. Electrons and positively charged Protons collide and overcome the electrostatic force between them and form a body filled with neutral Neutrons. Deep in the core of a neutron star, matter may crumble even further, forming strange, never-before-seen particles such as hypothetical hyperons. Perhaps, scientists believe, or the neutrons themselves can split apart inside a neutron star and create a soup of the worldThe most fundamental particles: Quarks.
Related: A strange cosmic object has been identified as the remains of an exploded dead star
What happens inside a neutron star is governed by the neutron star’s equation of state. Think of it as a playbook that predicts the structure and internal composition of a neutron star based on things like mass, temperature, Magnetic field etc. The problem is that scientists have literally hundreds of options for determining this equation of state. Since we cannot repeat it the earth Conditions inside a neutron star, testing which model is appropriate, depends heavily on how well they match what astronomical observations tell us.
However, now the discovery of three neutron stars with significantly lower surface temperatures compared to other neutron stars of similar age has provided a major clue, allowing researchers to reject three-quarters of the possible models for the neutron star’s equation of state in one state. do stroke Two are neutron stars pulsarsFast-spinning neutron stars shoot radio jets at us. A third neutron star, in the supernova remnant Vela Jr, does not show pulsar behavior, but this may just be because its radio jets are not pointing in our direction.
Neutron stars at X-ray wavelengths by European Space Agency‘s XMM-Newton telescope And NASA‘s Chandra X-ray Observatory.
“The extraordinary sensitivity of XMM-Newton and Chandra made it possible not only to detect these neutron stars, but also to collect enough light to determine their temperature and other properties,” said Camille Dies, XMM-Newton scientist at Europa. The agency in a statement
The hotter a neutron star is, the more energetic its X-rays, and the energy of the X-rays from these three neutron stars tells us that they are very cold as neutron stars. We say “cold,” but neutron stars are still exceptionally hot, with temperatures ranging from 1.9 million to 4.6 million degrees Celsius (3.4 million to 8.3 million degrees Fahrenheit). However, for their young ages, ranging from 840 years to 7,700 years, based on the size and expansion rate of their surrounding supernova remnants, they are considered extremely cold. Neutron stars are born at hundreds of billions or even trillions of degrees, and as they cool, other neutron stars of similar ages are twice as hot—sometimes even hotter.
Neutron stars can cool through two mechanisms. One is through thermal radiation from their surfaces, which allows heat energy to escape to the cold Space. The other is this neutrino emission, which steals energy from the core of a neutron star and is thought to be responsible for the rapid cooling of these three particular neutron stars.
However, the rate of cooling of neutron stars as a result of these mechanisms depends on the equation of state.
“The young age and cold surface temperature of these three neutron stars can only be explained by a rapid cooling mechanism,” said Nanda Ria of the Institute of Space Sciences and the Institute of Space Studies of Catalonia, one of the researchers. Statement. “Since enhanced cooling can only be enabled with certain equations of state, this allows us to eliminate a significant fraction of possible models.”
And didn’t they? The team estimates that three-quarters of all possible models can be discarded after this result. The researchers were able to determine this by calculating cold curves, which are basically graphs that show how neutron stars cool. Time. The shape of the curve depends strongly on neutron star properties such as mass and magnetic field strength, so, using machine learning, the team calculated the range of parameters that best describe each cooling curve, and then fit these to the potential. They gave. Equations of state, seeing which ones still fit and which can be discarded as having zero chance of matching the data.
This process has narrowed the range of possible equations of state, but the findings do more than describe neutrons. stars. The behavior of matter at subatomic scales under extreme pressure, extreme temperature, and crushing gravity is introduced. Quantum Effects also scientists currently lack a Quantum theory of gravityAnd an equation of state for neutron stars could put us on the path to bring quantum effects up and down.Gravity Physics finally as a single theory.
The findings are described in a paper published June 20 in the journal Nature Astronomy.
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