The Wukong satellite acts as a full-scale dark matter particle detection satellite, representing the human eye in the universe. The mission of the first astronomical satellite "Wukong" launched at the end of 2015 is to find evidence of the existence of dark matter particles in cosmic rays and gamma ray radiation. After more than a year of data accumulation, finally a major discovery.
So far, we have scanned four times in the past two years and obtained more than 3.5 billion high-energy particles.
The abscissa on the right picture above is time, the ordinate is the number of particles, and it grows steadily every day. If one day the instrument has a problem, it is not a straight line, it will fall, so this line is stable there. It proves that we have not wasted a minute in heaven, and all the time is working normally.
5TeV high energy electronics
This is a 5TeV high-energy electron we saw in the sky. It is also the first time in heaven that people can see such high-energy high-energy electrons directly.
What did the "Wukong" actually "see"?
The results of this publication are based on 530 days of data, and 1.5 million high-energy electrons were selected from 2.8 billion high-energy particles. The observed energy range is from 25 GeV to 5 TeV.
The electronic cosmic ray energy spectrum of the Wukong
First of all, the energy measurement range of the Wukong is significantly higher than other space projects in the world, opening up a new window for cosmic observation. AMS-02 (Alpha Magnetic Spectrometer) is less than 1 TeV, Fermi is probably below 2 TeV, but we are close to 5 TeV, and the extension of this window is especially important for science.
The high-precision cosmic ray electron spectroscopy (red data points) obtained by the "Wolf" satellite work in 530 days, and the measurement results (green dots) of the Alpha magnetic spectrometer led by Mr. Ding Yuzhong and the US Fermi satellite measurement results (Blue Dot) Comparison. The second is to measure the highest purity of TeV electrons, that is, to see clearly, the accuracy of the spectrum is the highest. Therefore, we say that “Wukong has obtained the world's most accurate high-energy electron spectrum of the universeâ€, which has the lowest background and the smallest systematic error.
For the first time in physics, it directly measured the inflection of the energy spectrum at 1 TeV, because after more than a decade of observation, the anomalies of high-energy electrons in the universe were found below 1 TeV, and there was an excess. Whether this excess comes from dark matter or special astrophysics, it is still not clear until now. Only by measuring this turn and dropping it down can we judge its physical source. We measured this "drop" and clarified the energy spectrum behavior of TeV electrons, providing critical data for determining whether high-energy electron cosmic rays below TeV are derived from dark matter annihilation.
That is to say, in the past, the international spending of so much money, tens of billions of people went down, saw the anomaly, what are these abnormalities? This time, we can basically determine this through our data.
Scientific observation has a special nature. It is supposed to be A, but it is often found that B, "planting beans and getting beans" is a common thing in science.
We found a remarkable phenomenon in the high-energy segment. This is the point where the traffic suddenly went up and down. This point is something we did not foresee. It can't be explained by the existing physics knowledge.
The phenomenon of the introduction of high-energy segments
When astronomers discovered that the solar system was rotating too fast around the center of the Milky Way, they had to imagine that in addition to the visible matter in the Milky Way, there must be other invisible matter, and their combined gravitational pulls the sun, making it Not to fly away from where you are now because of the high speed. The calculations made for this show that the total amount of these invisible substances far exceeds the visible substances, and these invisible substances are temporarily called dark matter. The discovery of dark matter has naturally become a major scientific frontier.
Our data volume is not enough to be 100% certain that we have found something, but the good news is that the "Wokong" is almost perfect in the sky, and continues to collect data. We hope that through the latter data, we can figure out that it can be used in TeV. What are these novel phenomena?
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