November 28, 2021

Beyond Going Long

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After all, there is no black hole behind the cosmic particle that passes through matter without interaction

How are you Earlier this year, scientists used the IceCube Neutrino Observatory He discovered a certain connection between a high-energy neutrino and an object far beyond the boundaries of our galaxy. However, recent research shows that we will have to rethink this exciting relationship. The portal drew attention to the topic IFLScience.

The particle passes through matter without reaction

Neutrinos are elementary particles belonging to leptons with half-spins. Thus, these particles are among the fermions and their properties have fascinated scientists around the world for decades.

Neutrinos are very special particles, which by virtue of their weight lag far behind most elementary particles. Compared to the electron, its mass is reduced by 500,000 times.

As the gate writes ScienceAlert, neutrinos are often referred to as “ghosts” because they are moving at close to the speed of light, and their mass is close to zero, but in particular they can pass through matter without any reaction.

However, some of that interaction is happening here and there, and if we’re lucky, the IceCube Observatory can spot it. One such event also occurred on October 1, 2019, when we detected a high-energy neutrino called IC191001A, which struck Antarctic ice, through this observatory.

Based on the characteristics of how the flash or light propagated from this event and the brightness value, the scientists were able to calculate the neutrino’s energy level, as well as the direction it came from. It turns out that IC191001A likely originated from a galaxy 750 million light-years away called 2MASX J20570298 + 1412165 in the constellation Dolphin.

ESA/Hubble, NASA, M. Kornmesser

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It came to us after a supermassive black hole with a mass of more than 30 million masses torn from the Sun, located in the heart of the galaxy 2MASX J20570298 + 1412165, a star approaching it. The event in which a star gets close enough to a supermassive black hole to swallow it is called a “tidal disturbance event, or TDE.”

During the TDE process A piece of matter falls into a black hole, which is accompanied by a flash of bright light and part of it is thrown into space. The heat from the TDE, designated AT2019dsg, was detected on April 9, 2019 by the Zwicky Transient Facility in California, just a few months before the IC191001A neutrino was detected in Antarctica. It has been said that the probability of neutrino and flare uncorrelated from TDE is only about 0.2%.

Neutrinos must have arisen in a different way

The results of a new study published in the journal Astrophysical Journal However, they suggest that the neutrino in question may not ultimately be related to the AT2019dsg event.

Illustration of a working disk of a black hole. DESY, Scientific Communication Laboratory

Recent calculations indicate that AT2019dsg is far from generating enough energy to produce such a high-energy neutrino as detected in Antarctica, the portal wrote. Phys.

The researchers came to these conclusions based on their calculations and data from the Atacama Large Millimeter/submillimeter Array (ALMA), which monitored the entire AT2019dsg event at radio wavelengths for more than 500 days.

They also found that the glow from TDE brightened for 200 days, peaked during this period, and then gradually began to fade. It has also been proven that this event released as much energy into the environment as what the Sun produces in about 30 million years.

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Although it is a large number, it is not enough to contact the neutrino. According to the available information, 1,000 times more energy would be required to produce a high-energy neutrino such as IC191001A.

In addition, the AT2019dsg stream would need to be “strange geometry”, but the whole event was “absolutely normal”. Given that the IC191001A neutrino is far from common, perhaps scientists will have to find a new explanation.