Beijing Time:2022-07-13 12:16
The Milky WayAt the center of the region, there is a mass 4.3 million times that of the Sun.Super black holeSagittarius A**(Sgr A*). This discovery won the 2020 Nobel Prize in Physics. But since then, astronomers have not been able to determine whether the total amount of matter there comes mainly from this black hole, or what percentage of the total matter comes from stars, smaller black holes, interstellar dust and gas, and dark matter. ..
The new study explored this question and found that up to 99.9% of the matter in the central region of the Milky Way comes from Sagittarius. In other words, there are no other celestial bodies except this super black hole at the center of the Milky Way.
According to the study, Einstein’sRelativityThe orbits of stars around massive objects are believed to differ from the orbits calculated by Newton’s classical mechanics, that is, each orbit is not exactly the same and is not stable. More specifically, the theory of relativity predicts that the orbits of stars orbiting super black holes will show a specific precession pattern, that is, the orbits of each orbit will be slightly different from the previous orbit. Theory predicts that they will display a lotus-like precession pattern, which scientists call Schwarzschild precession.
The study looked closely at the orbital patterns of the four stars closest to the Sagittarius A black hole: S2, S29, S38 and S55. By analyzing their orbital precession, the mass distribution of Sagittarius A black holes can be inferred. The results show that the excess mass inferred from the small difference seen in the orbit of the S2 star is 0.1% of the mass of the Sagittarius black hole.
“Measuring subtle changes in the orbits of distant stars orbiting the super black holes at the center of our galaxy is unimaginably difficult,” the team said in a press release announcing the results. “To make more discoveries, astronomers must not challenge the limits of scientific knowledge but challenge the limits of engineering technology.
The researchers point out that to complete such research, not only the accurate calculation of difficult theories, but also the continuous improvement of the sensitivity of observational instruments to achieve further advances is required.
The research team hopes that the Giant Magellan Telescope (GMT) and Thirty Meter Telescope (TMT) under construction will be able to measure data from even fainter stars with greater precision.
The study was published on January 19, 2022 in the journal Astronomy and Astrophysics.
(Relocation from The Epoch Times/Editor-in-Charge: Ye Ping)
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