“This is an interesting alternative hypothesis for how stars can end up holding onto more of their mass, so they can form such heavy black holes,
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,” says Vicky Kalogera, an astrophysicist at Northwestern University in Evanston,
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, Ill. But, she cautions,
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, “the mechanism is somewhat speculative.” Astronomers don’t have a good handle yet on how magnetic fields change as a star evolves,
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, she says, particularly as the star approaches the end of its life.
“It’s going to be hard to test our hypothesis,
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,” Petit says. Pinpointing the host galaxy of a future collision between obese black holes might help, but that’s fraught with ambiguity. If the galaxy is rich in heavy elements, then perhaps magnetic fields are needed to hold back the flow of gas from gigantic stars. But that doesn’t mean the black holes were born in that environment. They could also have formed early in the universe,
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, says Petit,
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, when their galaxy had fewer heavy elements,
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, in which case magnetic fields might not be necessary.
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