Astronomers find six galaxies trapped in ‘spider’s web’ of supermassive black hole


The finding helps astronomers understand how supermassive black holes formed and grew to their enormous sizes so quickly.

Thursday 1 October 2020 11:06, UK

Astronomers have found six galaxies lying around a supermassive black hole in a cosmic “spider’s web” of gas extending to more than 300 times the size of the Milky Way.

Researchers say it was formed when the universe was less than a billion years old and this is the first time such a close grouping has been seen so soon after the Big Bang.

The finding helps to better understand how supermassive black holes, one of which exists at the centre of our Milky Way, formed and grew to their enormous sizes so quickly.

It also supports the theory that black holes can grow rapidly within large, web-like structures, which contain plenty of gas to fuel them, according to the astronomers.

Another black hole found by the European Southern Observatory. Pic: ESO

Marco Mignoli, an astronomer at the National Institute for Astrophysics (INAF) in Bologna, Italy, and lead author of the study, said: “This research was mainly driven by the desire to understand some of the most challenging astronomical objects – supermassive black holes in the early universe.

Mr Mignoli added: “The cosmic web filaments are like spider’s web threads.

“The galaxies stand and grow where the filaments cross, and streams of gas – available to fuel both the galaxies and the central supermassive black hole – can flow along the filaments.”

According to the study, published in the Astronomy and Astrophysics journal, the light from this large web-like structure, with its black hole of one billion solar masses, has travelled to Earth from a time when the universe was only 900 million years old.

The VLT in the Atacama, overlooking the Pacific Ocean. Pic: ESO
Image:The Very Large Telescope, or VLT. Pic: ESO

Referring to supermassive black holes, co-author Roberto Gilli, also an astronomer at INAF in Bologna, said: “Our work has placed an important piece in the largely incomplete puzzle that is the formation and growth of such extreme, yet relatively abundant, objects so quickly after the Big Bang.”

It is thought the first black holes, believed to have formed from the collapse of the first stars, must have grown very fast to reach masses of a billion suns within the first 900 million years of the universe’s life.

Astronomers have struggled to explain how sufficiently large amounts of “black hole fuel” could have been available to enable these objects to grow to such enormous sizes in such a short time.

However, they suggest the new-found structure offers a likely explanation – the web-like structure and the galaxies within it contain enough gas to provide the fuel that the central black hole needs to quickly become a supermassive giant.

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