Black Hole Neutrino – Spectrum of Science


Astronomers have detected a neutrino at the South Pole that catapulted a supermassive hole in the heart of a neighboring galaxy in our direction 700 million years ago. It is true that for a long time it has not been unusual to detect such elusive particles from space on earth at all. However, it remains a great success to be able to understand exactly when, where and why a trapped neutrino was created. A large international research team led by Robert Stein from DESY in Hamburg has now documented such a stroke of luck in the journal “Nature Astronomy”.

 The  neutrino was detected on October 1, 2019 by the light sensors of the IceCube detector at the South Pole: ©

 The  particle had flown in with high energy, accidentally collided with an atom on site and thus betrayed itself. Something similar happens not infrequently. Since it was put into operation, the South Pole detector has detected several hundred particles every year, not from our solar system, but rather from deep space. After detection, the scientists then use the measurement data to determine the energy and direction of entry of the neutrinos. With a lot of luck, you will not only be able to locate the place of origin in a distant galaxy from which the neutrino flew in, but also narrow down a celestial event that could be related to the formation of the particle.

In this case, the trail pointed in the direction of the constellation Dolphin: ©

 The  neutrino had originated around 700 million years ago in the center of a galaxy with the catalog number 2MASX J20570298 + 1412165 and was catapulted in our direction. ©

 The  galaxy had already attracted astronomers’ attention in April 2019, half a year before the neutrino hit at the South Pole: ©

 The  camera of the Zwicky Transient Facility at the Mount Palomar Observatory noticed an unusual change in brightness there, which ultimately led to a so-called »tidal disruption event «(TDE) could be returned.

A TDE flashes when a star comes close to a supermassive black hole and is torn apart: ©

 The  distant sun is initially elongated by the enormous tidal forces and its gas is partly thrown away. Eventually the matter collects in an accretine disk that circles around the black hole and is gradually swallowed up by it. ©

 The  remnant of the star heats up and radiates to the earth.

Astronomers investigated the event in the dolphin constellation with an entire array of instruments and detected high-energy electromagnetic radiation at various wavelengths in order to examine the TDE in detail on site. Astronomers estimate the gigantic black hole with a mass of probably 30 million suns, while the Zwicky Transient Facility speaks of the second brightest of the more than 30 TDE events recorded there since 2018.

In such a turbulent environment, where other particles race into each other very quickly, neutrinos are regularly generated and sometimes thrown into space with a great deal of energy, together with all kinds of ordinary radiation. Astrophysicists speak of a blazar in this case; in other words, particle-throwing black holes whose jet matter jets are directed directly at the earth. In 2018, the astrophysicists from IceCube demonstrated a neutrino of such a monster for the first time, at that time the Blazar was called TXS 0506 + 056.

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Black Hole Neutrino Spectrum Science


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