The mass of the ultra-large black hole in the heart of the large Magellan cloud, a small milky satellite galaxy, is approximately 600,000 solar mass.
Impressions of the Hyper Belt Lattist artist ejected from the large Magellan cloud (shown on the right). If the binary star system gets too close to an ultra-large number of black holes, intense gravity will tear the pair apart. One star is captured in tight orbits around a black hole, while the other is thrown outward at extreme speeds – often exceeding thousands of kilometers per second, making it a high-speed star. The inset diagram illustrates this process. The orbital path of the original binary is displayed as an interwoven line, one star is captured by a black hole (near the center of the inset), and the other is ejected into space (bottom right). Image credit: CFA/Melissa Weiss.
“Our Milky Way galaxy halo includes a few stars running faster than local escape speeds in orbit that carry them into intergalactic space,” said Dr. Jesse Han, Ph.D. of the Harvard & Smithsonian Center for Astrophysics and Colleagues.
“One mechanism for generating such ultrafast stars is the Hills mechanism. When a close binary star wanders near an ultrahigh Massive black hole, one star can be captured, while the other is ejected at a rate that reaches more than a second.”
In their new study, astronomers followed the path with ultrafine accuracy of 21 superfast stars in halos outside the Milky Way.
They confidently categorized these stars, finding that seven of them coincided with those born out of the center of the Milky Way.
However, the other nine stars coincided with those born from the centre of the large Magellan cloud, about 160,000 light years away from us.
“Cosmologically speaking, it's amazing to notice another super-large black hole just below the block,” Dr. Han said.
“Black holes are so stealthy that this has been under our noses this time.”
Researchers discovered a large Magellanic Cloud black hole using data from ESA's Gaia Mission.
They also used improved understanding of the orbital of the d-star galaxies around the Milky Way, which was recently obtained by other astronomers.
“We knew these superfast stars had been around for a while, but Gaia provided us with the data we needed to figure out where they actually came from,” says Dr. Kareem El-Badry, an astronomer at Caltech.
“Combining these data with a new theoretical model of how these stars move, we made this incredible discovery.”
“The only explanation we can come up with for these data is the presence of a monster black hole in the next Galaxy,” said Dr. Scott Lucchini, an astronomer at the Harvard & Smithsonian Center for Astrophysics.
a paper Reporting this finding is published in Astrophysical Journal.
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Ji Won Jesse Han et al. 2025. Hyper Belt Lattist tracks ultra-high Massive black holes in the large Magellan clouds. APJin press; Arxiv: 2502.00102
Source: www.sci.news
