Mysterious ‘heartbeat’ detected from cosmic gas cloud



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Scientists have discovered an unusual and mysterious “heartbeat” from a cloud of cosmic gas.

The cloud – which is otherwise unremarkable – appears to “beat” with the rhythm of a nearby black hole, the researchers say.

As such, they appear to be related to each other, the researchers write in a new journal. But it’s unclear how the cloud’s gamma ray “heartbeat” may be connected to the black hole, which is 100 light years away.

The research team found the heartbeat after browsing ten years of data from NASA’s Fermi Gamma-ray Space Telescope. They were looking at a system known as S 433, about 15,000 light years from us, which includes a giant star that is about 30 times the mass of our sun as well as a huge black hole.


Every 13 days, the black hole and the star revolve around each other. As they do so, the black hole sucks material from the giant star.

“This material accumulates in an accretion disk before falling into the black hole, like water in the vortex above a bathtub drain,” said Jian Li, one of the researchers at the paper. “However, some of this material does not fall down the drain but spurts out at high speed in two narrow jets in opposite directions above and below the rotating accretion disk.”

This accretion disk is not exactly aligned with the orbit of the two objects. Instead, it wobbles over time like a spinning top that’s not flat, and so the two jets spiral through space rather than shoot in straight lines.

These jets oscillate over a period of approximately 162 days. And that same rhythm is seen in the gamma ray signal in the cloud, relatively far from these jets, which otherwise wouldn’t be noticeable – but appear to send an emission fueled by the jets.

“Finding such an unambiguous connection by synchronization, about 100 light years from the micro quasar, not even in the direction of the jets, is as unexpected as it is amazing,” Li says. “But how the black hole can fuel the heartbeat. of the gas cloud is not clear to us. “

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