Astronomers discover 83 supermassive black holes 13 billion light-years away

Agencies
March 15, 2019

Washington, Mar 15: 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.

Comments

ABDUL AZIZ SHE…
 - 
Saturday, 16 Mar 2019

SUBHAANALLAH

 

 
ALLAH ALMIGHTY CREATED EVERTHING  INCLUDING WHOLE UNIVERSE AND WHAT IS IN IT,

HUMAN BEING CANNOT REACH TO UNDERSTAND IT,  HUMAN LIFE NOT SUFFEICENT TO REACH AND KNOW EVERYTHING.

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News Network
January 10,2020

Dubai, Jan 10: Iran denied on Thursday that a Ukrainian airliner that crashed near Tehran had been hit by a missile, Iranian government spokesman Ali Rabiei said in a statement, according to state TV.

"All these reports are a psychological warfare against Iran. All those countries whose citizens were aboard the plane can send representatives and we urge Boeing to send its representative to join the process of investigating the black box".

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News Network
June 18,2020

New Delhi, Jun 18: India on Wednesday took strong exception to China claiming sovereignty over the Galwan Valley in eastern Ladakh, saying its "exaggerated and untenable claims" are contrary to the understanding reached on the issue between the two sides.

Ministry of External Affairs Spokesperson Anurag Srivastava's response came after China claimed that the Galwan Valley in eastern Ladakh is a part of its territory.

"As we have conveyed earlier today, External Affairs Minister and the State Councillor and Foreign Minister of China had a phone conversation on recent developments in Ladakh," Srivastava said late Wednesday night.

"Both sides have agreed that the overall situation should be handled in a responsible manner and that the understandings reached between Senior Commanders on 6th June should be implemented sincerely. Making exaggerated and untenable claims is contrary to this understanding," he said.

Earlier on Wednesday, India delivered a strong message to China that the "unprecedented" incident in the Galwan Valley will have a "serious impact" on the bilateral relationship and held the "pre-meditated" action by Chinese army directly responsible for the violence that left 20 Indian Army personnel dead.

In a telephonic conversation, External Affairs Minister Jaishankar conveyed to his Chinese counterpart Wang Wi India's protest in the "strongest terms" and said the Chinese side should reassess its actions and take corrective steps, the Ministry of External Affairs said.

The Chinese Foreign Ministry, in a statement, said the two sides agreed to "cool down the situation on the ground as soon as possible", and maintain peace and tranquillity in the border area in accordance with the agreement reached so far between the two countries.

The clash in Galwan Valley on Monday night is the biggest confrontation between the two militaries after their 1967 clashes in Nathu La in 1967 when India lost around 80 soldiers while over 300 Chinese army personnel were killed.

The India-China border dispute covers the 3,488-km-long LAC. China claims Arunachal Pradesh as part of southern Tibet, while India contests it.

Prior to the clashes, both sides have been asserting that pending the final resolution of the boundary issue, it is necessary to maintain peace and tranquillity in the border areas.

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News Network
June 11,2020

New Delhi, Jun 11: Petrol and diesel prices on Thursday were hiked by 60 paise per litre each - the fifth straight daily increase in rates since oil PSUs ended an 82-day hiatus in rate revision.

Petrol price in Delhi was hiked to Rs 74 per litre from Rs 73.40 while diesel rates were increased to Rs 72.22 a litre from Rs 71.62, according to a price notification of state oil marketing companies.

Rates have been increased across the country and vary from state to state depending on the incidence of local sales tax or VAT.

This is the fifth daily increase in rates in a row since oil companies on Sunday restarted revising prices in line with costs, after ending an 82-day hiatus.

In five hikes, petrol price has gone up by Rs 2.74 per litre and diesel by Rs 2.83.

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