The findings appear ,
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in a paper in the Jan. 5 Nature and two papers in the Jan,
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. 10 Astrophysical Journal Letters.
“Without a doubt,
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, this is a landmark event,” said Duncan Lorimer,
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, an astrophysicist at West Virginia University who was not involved with these studies but did discover the first radio burst roughly a decade ago. “There’s no question about the validity of the result.”
The host galaxy is tiny. “We’re barely able to distinguish it from a star,
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,” said project member Shriharsh Tendulkar, an astrophysicist at McGill University in Montreal. It has roughly one one-thousandth of the stars as the Milky Way and is less than one-tenth as wide. “That’s weird,
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,” he said. One favored explanation for fast radio bursts is that they come from neutron stars,
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, the dense cores left behind after a massive star explodes. But if neutron stars are responsible,
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, then astronomers expect to find bursts in places with lots of stars, Tendulkar said.
Tracing FRB 121102 back to a dwarf galaxy doesn’t rule out neutron stars as a source. The gas in dwarf galaxies is more pristine than in other locales such as the Milky Way — with relatively low amounts of elements heavier than helium. Such gas makes it easier for massive stars to form. More heavyweight stars lead to more neutron stars, which could lead to more radio bursts.

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