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
March 20,2020

New Delhi, Mar 20: The coronavirus pandemic will leave behind a global recession with small businesses, self-employed and daily wagers taking the worst hit, Mahindra Group Chairman Anand Mahindra said on thursday.

"The virus will eventually be conquered, but it will have left behind a global recession. The costs of that are incalculably high at this time. The most fearsome toll will be on small businesses, the self-employed & those whose lives depend on meagre daily wages," Mahindra said in a tweet.

Apart from the toll on lives, the legacy of Covid-19 may well be deaths due to stress, loss of livelihoods, a rise in homelessness and in extreme situations, civil unrest, he added.

"The only global experience that has lessons for us in the current situation is the last world war. In the aftermath of WW2, the US came up with the Marshall plan to revive Europe, effectively a giant fiscal pump-priming," Mahindra said.

In the US, the government dramatically dismantled regulations and opened up the economy to trade and these actions led to a boom-cycle that stretched to 1975, he added.

"This time, there will be no victors, only the vanquished. So every country will have to create its own post ‘virus war” marshall plan & take care of those in society who are hit the hardest. Perhaps we too can build the foundations of a sustained global growth cycle," Mahindra said.

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Agencies
February 18,2020

British lawmaker Debbie Abrahams' e-Business visa was revoked as she was involved in anti-India activities and the cancellation was conveyed to her on February 14, government sources said on Tuesday.

Asserting that the grant, rejection or revocation of a visa or electronic travel authorisation is the sovereign right of a country, the sources said Abrahams was issued an e-Business visa on October 7 last year which was valid till October 5, 2020 for attending business meetings.

"Her e-Business visa was revoked on February 14, 2020 on account of her indulging in activities which went against India's national interest. The rejection of the e-Business visa was intimated to her on February 14," a source said.

Abrahams, who chairs a British parliamentary group on Kashmir, was denied entry into India upon her arrival at the New Delhi airport on Monday.

Government officials had said on Monday also that she was informed in advance that her e-visa had been cancelled.

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News Network
May 11,2020

Kabul, May 11: Four back-to-back roadside bombs exploded in a northern district of Afghanistan's capital Kabul on Monday, wounding four civilians including a child, police said. Kabul police spokesman Ferdaws Faramarz said a clearance team was at the site of the attacks.

Militants have carried out several roadside bombings and rocket attacks in Kabul and other parts of the country in recent weeks, but Monday's four consecutive explosions appeared to be the first coordinated effort for some months.

The Taliban has not carried out any large attacks in the city since they signed a landmark withdrawal deal with the US in February, meant to pave the way for peace in the country. No group has claimed the attacks. The explosions come as authorities are trying to impose a lockdown in the capital to curb the spread of coronavirus in the country.

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