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.

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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 18,2020

Jan 18: Days after the arrest of Deputy SP Davinder Singh along with two Hizbul Mujahideen terrorists, Shiv Sena on Saturday questioned the role of police in the Kashmir Valley.

"Cross border infiltration is ongoing in Kashmir. But the police machinery is being used to help the terrorists in Kashmir to safely cross the border (to Pakistan) and a President's medal awarded Deputy SP was arrested for doing so. In Kashmir (it seems), the government is using the police for some other purposes, what will the country's Home Ministry say if somebody has a doubt in connection with the Pulwama attacks," Sena mouthpiece, Saamna, read.

This was in reference to the incident in which Jammu and Kashmir police intercepted a vehicle on Sunday and arrested DySP Davinder Singh along with two top Hizbul Mujahideen terrorists, who were travelling together.

The Sena mouthpiece asserted that the impact and acceptance of the Centre removing Article 370 should be visible "through the people" during the upcoming Republic Day celebrations.

"Jammu and Kashmir is now a Union Territory. It is being ruled by the Centre through President's Rule. The government had removed Article 370 in a historic decision...The joy and excitement in the people over the removal of 370 should be visible in the Republic Day celebrations this time. The tricolour should be seen flying over all houses in Kashmir, it is the least that can be expected," it added.

The Sena mouthpiece further said that with the arrest of terrorists in the recent days, it hoped that "Republic Day will be celebrated safely in Delhi, Jammu and Kashmir".

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News Network
June 2,2020

London/Milan, Jun 2: World Health Organization experts and a range of other scientists said on Monday there was no evidence to support an assertion by a high profile Italian doctor that the coronavirus causing the COVID-19 pandemic has been losing potency.

Professor Alberto Zangrillo, head of intensive care at Italy's San Raffaele Hospital in Lombardy, which bore the brunt of Italy's COVID-19 epidemic, on Sunday told state television that the new coronavirus "clinically no longer exists".

But WHO epidemiologist Maria Van Kerkhove, as well as several other experts on viruses and infectious diseases, said Zangrillo's comments were not supported by scientific evidence.

There is no data to show the new coronavirus is changing significantly, either in its form of transmission or in the severity of the disease it causes, they said.

"In terms of transmissibility, that has not changed, in terms of severity, that has not changed," Van Kerkhove told reporters.

It is not unusual for viruses to mutate and adapt as they spread, and the debate on Monday highlights how scientists are monitoring and tracking the new virus. The COVID-19 pandemic has so far killed more than 370,000 people and infected more than 6 million.

Martin Hibberd, a professor of emerging infectious disease at the London School of Hygiene & Tropical Medicine, said major studies looking at genetic changes in the SARS-CoV-2 virus that causes COVID-19 did not support the idea that it was becoming less potent, or weakening in any way.

"With data from more than 35,000 whole virus genomes, there is currently no evidence that there is any significant difference relating to severity," he said in an emailed comment.

Zangrillo, well known in Italy as the personal doctor of former Prime Minister Silvio Berlusconi, said his comments were backed up by a study conducted by a fellow scientist, Massimo Clementi, which Zangrillo said would be published next week.

Zangrillo told Reuters: "We have never said that the virus has changed, we said that the interaction between the virus and the host has definitely changed."

He said this could be due either to different characteristics of the virus, which he said they had not yet identified, or different characteristics in those infected.

The study by Clementi, who is director of the microbiology and virology laboratory of San Raffaele, compared virus samples from COVID-19 patients at the Milan-based hospital in March with samples from patients with the disease in May.

"The result was unambiguous: an extremely significant difference between the viral load of patients admitted in March compared to" those admitted last month, Zangrillo said.

Oscar MacLean, an expert at the University of Glasgow's Centre for Virus Research, said suggestions that the virus was weakening were "not supported by anything in the scientific literature and also seem fairly implausible on genetic grounds."

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News Network
March 6,2020

New Delhi, Mar 6: As panicky depositors rushed to withdraw money from Yes Bank whose control was seized by the RBI in a dramatic late-night move, Finance Minister Nirmala Sitharaman on Friday assured depositors that their money is safe and said the central bank was working for an early resolution of the crisis.

The Reserve Bank of India (RBI) on Thursday evening capped withdrawals at Rs 50,000 for the next one month and imposed strict limits on operations at the country's fourth-largest private lender that faced "regular outflow of liquidity" after an effort to raise new capital failed.

"I am in continuous interaction with the RBI. The RBI is fully seized of the matter and has assured they will give a quick resolution," Sitharaman said here.

She said no depositor will lose his or her money and insisted that the immediate priority is to ensure Yes Bank customers are able to withdraw money within the stipulated cap.

"I want to assure every depositor that their money shall be safe. Their monies are safe," she said. "I am constantly in contact with the RBI and the steps that are taken are taken in the interest of depositors, banks and economy. We are fully seized of the development."

She was talking to reporters after meeting State Bank of India (SBI) Chairman Rajnish Kumar. On Thursday, the SBI board gave its "in-principle" approval to exploring investment opportunities in Yes Bank.

"So I repeat, the depositors can be assured that their money is safe," she said.

Soon after the RBI takeover, depositors thronged Yes Bank ATMs to withdraw money and police had to be deployed in some places to control the crowds.

Yes Bank has 1,000 branches across the country.

Refusing to elaborate on her meeting with the SBI chairman, the minister said that "was on a completely different matter".

"RBI governor has given me assurance that there will be an appropriate resolution soon. No depositor will lose (money)," she said. "Reserve Bank has taken cognizance of the problem."

The central bank, she said, has gone through the "process over and over again to find out an amicable solution".

"And that has been over the last couple of months. So it is not as if they have come in suddenly now. We have been monitoring the situation," she said adding the RBI has appointed an administrator who previously was with the SBI.

"Both the RBI and the government are looking at this with all the details before them, not just today. I have personally monitored the situation over the last couple of months with the RBI. Therefore we have taken a course which will be in everybody's interest," she added.

Yes Bank had been seeking new capital since last year to bolster its ratios and quell questions about its stability due to its exposure to the non-banking finance industry entangled in a prolonged crunch in the local credit market.

The SBI chairman said the resolution to the Yes Bank crisis will come "very shortly".

"This is not a sectoral problem. It is a bank-specific problem," he said. "The RBI will take all steps to ensure financial stability."

On SBI picking up a stake in Yes Bank, he said the lender already has an in-principle approval for doing so.

"If SBI has to pick up a stake in Yes Bank, we have an in-principle approval for that," he said.

Commenting on the crisis at Yes Bank, Alka Anbarasu, Vice President – Senior Credit Officer, Financial Institutions, Moody's Investors Service, said: "RBI's moratorium on Yes Bank is credit negative as it affects timely repayment of bank depositors and creditors."

"While Moody's expects Indian authorities will take steps to prevent the weakness in the bank's viability from significantly impacting its depositors and senior creditors, the lack of a coordinated and timely action highlights continued uncertainty around bank resolutions in India," she said.

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