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83 supermassive black holes found in early universe

Press Trust of India  |  Washington 

Astronomers have discovered 83 powered by 13 billion light-years away from the Earth, from a time when the universe was less than 10 per cent of its present age.

"It is remarkable that such massive dense objects were able to form so soon after the Big Bang," said Michael Strauss, a at in the US.

"Understanding how black holes can form in the early universe, and just how common they are, is a challenge for our cosmological models," Strauss said in a statement.

This finding, published in The Astrophysical Journal, increases the number of black holes known at that epoch considerably, and reveals, for the first time, how common they are early in the universe's history.

In addition, it provides new insight into the effect of black holes on the physical state of gas in the early universe in its first billion years.

Supermassive black holes, found at the centers of galaxies, can be millions or even billions of times more massive than the Sun.

While they are prevalent today, it is unclear when they first formed, and how many existed in the distant early universe.

A supermassive becomes visible when onto it, causing it to shine as a "quasar."

Previous studies have been sensitive only to the very rare, most luminous quasars, and thus the most massive black holes.

The new discoveries probe the population of fainter quasars, powered by black holes with masses comparable to most black holes seen in the present-day universe.

The team used data taken with "Hyper Suprime-Cam" (HSC) instrument, mounted on the Subaru Telescope of the National Astronomical Observatory of Japan, which is located on the summit of Maunakea in

The researchers selected distant quasar candidates from the sensitive HSC survey data.

They then carried out an intensive observational campaign to obtain spectra of those candidates, using three telescopes: the Subaru Telescope; the Gran Telescopio Canarias on the island of in the Canaries, Spain; and the Gemini South Telescope in

The survey revealed 83 previously unknown very distant

Together with 17 already known in the survey region, the researchers found that there is roughly one supermassive per cubic giga-light-year.

The sample of quasars in this study are about 13 billion light-years away from the Earth.

In other words, we are seeing them as they existed 13 billion years ago.

As the Big Bang took place 13.8 billion years ago, we are effectively looking back in time, seeing these quasars and as they appeared only about 800 million years after the creation of the universe.

(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)

First Published: Thu, March 14 2019. 13:35 IST
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