Black holes are more common than physicists thought—and stranger than they expected. ScienceMagArchives
. Today, however, researchers with a global network of gravitational wave detectors announced the first major statistical analyses of their data so far, 50 events in all. Posted online in four papers, the analyses show that black holes—ghostly ultraintense gravitational fields left behind when massive stars collapse—are both more common and stranger than expected. They also shed light on mysteries such as how such black holes pair up before merging.
Analyses of all 50 events show that when it comes to black holes,"the diversity is surprisingly large," says Frank Ohme, a gravitational wave astronomer at the Max Planck Institute for Gravitational Physics. From details of the mergers' chirplike signals, scientists can calculate the masses of the colliding black holes.
Their new ability to take a census of black holes has also enabled researchers to probe whether black holes in a merging pair point in the same direction as they orbit each other—a potential clue to how the pair came together in the first place. If the spins align with the orbital axis, the black holes might have formed from a pair of stars that were born together, naturally acquired matching spins, and remained companions after they collapsed.
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