Daily Telescope: Black holes have been merging for a long, long time

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It showcases the coming together of two massive black holes in the early Universe, just 740 million years after the Big Bang.

The discovery of this merger so early in the Universe indicates that the growth of these objects in the centers of galaxies occurred very rapidly.

Fortunately, Webb and its Near-Infrared Spectrograph are well positioned to observe the fast-moving dense gas characteristic of black holes accreting matter.

As they swallow nearby matter, black holes produce highly ionized gas.

"Our findings suggest that merging is an important route through which black holes can rapidly grow, even at cosmic dawn," said Hannah Übler of the University of Cambridge.

"Together with other Webb findings of active, massive black holes in the distant Universe, our results also show that massive black holes have been shaping the evolution of galaxies from the very beginning."

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