Missing: a black hole with 10 billion solar masses

The two knots, they concluded, were probably small internal motions with small galaxies being cannibalized by the larger galaxy. The measurement of the third knot had such a large error bars that it could not yet be considered as a black hole location or out of it.

Dr. Burke-Spolo reported that the fourth, very compact knot near the bottom edge of the core was also unconscious. “Observing this knot requires more time (hundreds of hours) with the Hubble Space Telescope,” he said in an email, and therefore remains a candidate for a black-hole hiding location .

The galaxy core also emits radio waves, but they did not help in the search, Drs. Burke-Spolor said.

“We were originally hoping that the radio emission would be some sort of literal smoke gun, showing an active jet that points directly back to the black-hole location,” she said. But the radio remnant, according to its spectral characteristics, was at least 50 million years old, meaning that it would have been enough time for the large black hole to move elsewhere after the jet took off.

The next stop was the orbiter of NASA’s Chandra X-ray Observatory. Kahan Gultekin of the University of Michigan, another veteran nuker who was not on the original search team, aimed the telescope at the cluster core and those suspected knots. No dice Dr. Gultekin said that if there is any possible black money, one millionth of its potential rate has to be fed.

“Either a black hole in the center is very faint, or it is not,” he wrote in an email. The same thing holds for the case of a binary black-hole system, he said; Very little gas will be required to hide it.

Meanwhile, Imran Naseem of the University of Surrey in the UK, who Drs. Postman, who was not part of the team, has published a detailed analysis of how the merger of two supermassive black holes can improve the galaxy that astronomers have found. .

Dr. “The bus, the gravitational wave, rediscovers the supermassive black hole from the galaxy,” Nassim explained in an email. After losing its supermassive anchor, a cloud of stars spread around the black hole binary, spreading more. The density of stars in that region – the densest part of the entire massive galaxy – is only one-tenth the density of stars in our own neighborhood of the Milky Way, which would result in the night sky appearing anemic compared to our own.

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