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Black Hole Moment of Shredding a Star in ‘Spaghettification’ is Pivotal Moment for Astronomers

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Star captured by Hubble being ripped apart by a black hole in a galaxy 850 million light years away – Credit: NASA, ESA, Ryan Foley/UC Santa Cruz

An intermediate-mass black hole lurking undetected in a dwarf galaxy revealed itself to astronomers when it gobbled up an unlucky star that strayed too close.

The shredding of the star is known as a ‘tidal disruption event’ or ‘spaghettification’—and it produced a flare of radiation that briefly outshone the combined stellar light of the host dwarf galaxy, which could help scientists better understand the relationships between black holes and galaxies.

One of the biggest open questions in astronomy has been how supermassive black holes form, according to the co-author of the paper detailing the new discovery.

Astronomers detected the first signs of light as the black hole began eating a star—and it became a pivotal discovery because the duration of such an event can be used to measure mass.

The flare was captured by astronomers with the Young Supernova Experiment (YSE), a survey designed to detect cosmic explosions and transient astrophysical events.

An international team led by scientists at UC Santa Cruz, the Niels Bohr Institute at the University of Copenhagen, and Washington State University reported the discovery in a paper published this week in Nature Astronomy.

“This discovery has created widespread excitement because we can use tidal disruption events not only to find more intermediate-mass black holes in quiet dwarf galaxies, but also to measure their masses,” said coauthor Ryan Foley, an assistant professor of astronomy and astrophysics at UC Santa Cruz, who helped plan the YSE survey.

First author Charlotte Angus at the Niels Bohr Institute said the team’s findings provide a baseline for future studies of midsize black holes.

“The fact that we were able to capture this midsize black hole whilst it devoured a star offered us a remarkable opportunity to detect what otherwise would have been hidden from us,” she explained.

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“What is more, we can use the properties of the flare itself to better understand this elusive group of middle-weight black holes, which could account for the majority of black holes in the centers of galaxies.”

Supermassive black holes are found at the centers of all massive galaxies, including our own Milky Way. Astronomers conjecture that these massive beasts, with millions or billions of times the mass of the sun, could have grown from smaller “intermediate-mass” black holes with thousands to hundreds of thousands of solar masses.

One theory for how such massive black holes were assembled is that the early universe was rampant with small dwarf galaxies with intermediate-mass black holes. Over time, these dwarf galaxies would have merged or been gobbled up by more massive galaxies, their cores combining each time to build up the mass in the center of the growing galaxy. This merger process would eventually create the supermassive black holes seen today.

“If we can understand the population of intermediate-mass black holes out there—how many there are and where they are located—we can help determine if our theories of supermassive black hole formation are correct,” said coauthor Enrico Ramirez-Ruiz, professor of astronomy and astrophysics at UCSC and Niels Bohr Professor at the University of Copenhagen.

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But do all dwarf galaxies have midsize black holes?

Classic black hole hunting techniques, which look for actively feeding black holes, are often not sensitive enough to uncover black holes in the centers of dwarf galaxies. As a result, only a minuscule fraction of dwarf galaxies is known to host intermediate-mass black holes. Finding more midsize black holes with tidal disruption events could help to settle the debate about how supermassive black holes form.

Data from the Young Supernova Experiment enabled the team to unlock how big the black hole was—a method, until now, which had only been shown to work well for supermassive black holes.

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“This flare was incredibly fast, but because our YSE data gave us so much early information about the event, we were really able to pin down the mass of the black hole using it,” Angus said.

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