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September 18 2020
10:27 AM

Record-breaking gravitational waves reveal that midsize black holes do exist
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The biggest. The farthest. The most energetic. A new detection of gravitational waves from two colliding black holes has racked up multiple superlatives.

What’s more, it also marks the first definitive sighting of an intermediate mass black hole, one with a mass between 100 and 100,000 times the sun’s mass. That midsize black hole was forged when the two progenitor black holes coalesced to form a larger one with about 142 solar masses. It significantly outweighs all black holes previously detected via gravitational waves, ripples that wrinkle spacetime in the aftermath of extreme events.

“This is the big guy we’ve been waiting for, for the longest time,” says Emanuele Berti, a physicist at Johns Hopkins University who was not involved with the research. One of the behemoth’s two progenitors was itself so massive that scientists are pondering how to explain its existence.

Detected on May 21, 2019, the gravitational waves originated from a source about 17 billion light-years from Earth, making this the most distant detection confirmed so far. Because of the expansion of the universe, that distance corresponds to a travel time of about 7 billion years, meaning that the gravitational waves were emitted when the universe was about half its current age. It’s also the most energetic event yet seen, radiating about eight times the equivalent of the sun’s mass in energy, says astrophysicist Karan Jani of Vanderbilt University in Nashville, a member of the LIGO Scientific Collaboration. “I hope it deserves its own entry in the record book.”

The new event dethrones the previous record-holder, a collision that occurred about 9 billion light-years away that radiated about five solar masses worth of energy, and created a black hole of 80 solar masses (SN: 12/4/18).

Researchers with LIGO, or the Advanced Laser Interferometer Gravitational-Wave Observatory, in the United States and Advanced Virgo in Italy reported the new detection September 2 in two papers in Physical Review Letters and the Astrophysical Journal Letters.

While scientists know of black holes with tens of solar masses and others with millions or billions of solar masses, the intermediate echelon has remained elusive. Previous purported sightings of intermediate mass black holes have been questioned (SN:1/22/16).

But, for the new event, “there’s no doubt,” says astrophysicist Cole Miller of University of Maryland at College Park, who was not involved with ...


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Courtesy, The Oregon Herald.

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