83 supermassive black holes found in early universe

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

83 supermassive black holes found in early universe

A supermassive black hole becomes visible when gas accretes onto it, causing it to shine as a ''quasar''. — Thinkstock

shriaya.dutt@tribuneindia.com

WASHINGTON

Astronomers have discovered 83 quasars powered by supermassive black holes 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 professor at Princeton University 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 black hole becomes visible when gas accretes 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 Hawaii.

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 La Palma in the Canaries, Spain; and the Gemini South Telescope in Chile.

The survey revealed 83 previously unknown very distant quasars.

Together with 17 quasars already known in the survey region, the researchers found that there is roughly one supermassive black hole 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 supermassive black holes as they appeared only about 800 million years after the creation of the universe. — PTI 

Cities

View All

4 Lakhi Jungle panches move no-trust vote against sarpanch

Allege she was not consulting them before taking decisions

Woman booked for duping husband of Rs 20L

After calling him to Canada, she left him citing ‘extramarit...

100 trees face axe for road to Mohali

UT completes formalities to acquire 13 acres in Dadu Majra &...

2019: Quantum jump in drug seizure

226 were held with drugs, including cocaine, charas, ganja, ...

DSP opens fire at wife, booked

Narrow escape for victim as bullet misses shoulder

Ahead of elections, Kejriwal brings out ‘guarantee card’

Delhi CM promises free bus rides for students, mohalla marsh...

Tile work ‘choking’ trees

Council of Engineers lodges complaint with NGT chief

Dyers move NGT against ministry order

Have been asked to construct canal for waste discharge

Rs 35-cr building at GMC yet to open

Health Corporation, college authorities blame each other for...

No swine flu cases in dist this season

61 cases were reported in 2019; Health Dept taking proactive...