Event Horizon Telescope Collaboration, also known as the eht Collaboration, recently released a new photo (March 27). This is the first time humans have seen the supermassive black hole hidden in the center of the Milky Way - Sagittarius A under polarized light. The image reveals a strong and orderly spiral magnetic field at its edges. Three years ago (March 2021), the EHT collaboration released an image of the supermassive black hole in the center of the M87 galaxy under polarized light. The polarized light images of the two black holes have very similar magnetic field structures, which means that strong magnetic fields may be a common feature of all black holes. This research was published recently (March 27) in the international academic journal "Astrophysics Letters".
Speaking of black holes, we must mention that the world's first black hole photo was released five years ago. It was a supermassive black hole located in the center of the M87 galaxy, taken by the EHT collaboration in April 2017. The photo shows a bright ring-like structure with a dark area in the middle that looks like a donut.
Not long ago, on January 18 this year, the EHT Collaboration released the second photo of the M87 black hole in the magazine "Astronomy and Astrophysics", which is the one on the right on the big screen. It is still the same black hole. , but the photo was taken a year later than the first one, in April 2018. The new photo of the M87 black hole is similar to the first photo taken in 2017, showing a ring-like structure of equal size. There is still a deep dark shadow in the middle of the bright ring. The dark shadow in the middle is the "black hole shadow" predicted by general relativity. However, compared with the first photo on the left, the brightest part of the ring structure in the new photo is deflected at an angle.
were filmed one year apart. What’s the difference between the two “donuts”?
are both M87 star black holes. Two photos taken a year apart. The two "donuts" look similar but slightly different. What does this mean? Among the scientists who took photos of black holes, developed them, and analyzed and interpreted the photos, there was a Chinese scientific research team to see them interpret the mysteries behind the black hole photos.
reporter Dou Yunyun: I am now at the Shanghai Observatory. Behind me are two photos of the M87 black hole released by the EHT International Cooperation Organization. The one on the left was taken in 2017, and the one on the right was taken in 2018. The photo taken in 2017 was released in 2019 and is also the first photo of a black hole taken by humans. The photo on the right is a recently released photo of the M87 black hole. You can see that the bright parts of these two black hole photos have changed their positions to a certain extent.
Lu Rushen, a researcher at the Shanghai Observatory of the Chinese Academy of Sciences: We can see in that there is a black so-called shadow in the middle. Then this shadow indicates the existence of the black hole and the central black hole. Then we can see the ring around it. Structure. This is due to the bright ring-like structure around the black hole's shadow predicted by Einstein's general theory of relativity. Then we can see that the size of the ring structure in the two pictures is actually the same. Although a year has passed between the two shots, we see that the structure of this shadow is consistent. What is different is the brightest position on the bright ring. We found that its position angle has moved from due south, that is, below, to this direction, which has changed by about 30 degrees. Then when we compare the results of these two images, we find that in fact the size of the ring structure has not changed. This is very consistent with our theoretical expectation that the ring structure is mainly determined by the shadow of the black hole, so here The change actually means that the black hole accretes the surrounding material, including its eruption of so-called jets. The environment around the black hole actually changes over time. It is a dynamic physical process.
Source: CCTV News Client
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