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 13,2020

Jan 13: India lost more than $1.33 billion to internet restrictions in 2019 as Prime Minister Narendra Modi’s government pushed ahead with his party’s Hindu nationalist agenda, raising tensions and sparking nationwide protests.

The worst shutdown has been in Kashmir, where after intermittent closures in the first half of the year, the internet has been cut off since Aug. 5 following the government’s decision to revoke the special autonomous status of the country’s only Muslim-majority state, a study said. The prologued closure was criticized by India’s highest court, which ruled Friday that the “limitless” internet shutdown enforced by the government for the last five months was illegal and asked that it be reviewed.

India imposed more internet restrictions than any other large democracy, according to the Cost of Internet Shutdowns 2019 report released by Top10VPN, a U.K.-based digital privacy and security research group. The South Asian nation recorded the third-highest losses after Iraq and Sudan, which lost $2.31 billion and $1.86 billion respectively to disruptions. Worldwide internet restrictions caused losses worth $8.05 billion, the report said.

The cost of internet blackouts was calculated using indicators from groups including the World Bank, International Telecommunication Union, and the Delhi-based Software Freedom Law Center. It includes social media shutdowns in its calculations.

India’s ministry of information and technology didn’t respond to an email seeking a response to the report’s findings.

‘Conservative Estimates’

Through 2019, India shut access to the internet for over 4,000 hours. The report added shutdowns in India were often narrowly targeted, down to the level of blocking city districts for a few hours to allow security forces to restore order. Many of these incidents were not included in the report.

“These are conservative estimates,” said Simon Migliano, head of research at U.K.-based Top10VPN. “Internet shutdowns are increasing and it shows a damaging trend.”

India’s other major internet disruptions coincided with two moves by the government that affect India’s Muslim minority. The first disruption took place in November in the states of Uttar Pradesh and Rajasthan after the Supreme Court handed a victory to Hindu groups over Muslim petitioners in a long-simmering dispute over a plot of land.

There were further disruptions in December when protests erupted against the introduction of a religion-based law that allows undocumented migrants of all faiths except Islam from neighbouring countries to seek Indian citizenship. The government enforced shutdowns across Uttar Pradesh and some Northeastern states in order to quell the protests, the report said.

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News Network
May 30,2020

Coronavirus lockdown in India has been extended till June 30 with more relaxations.

While the lockdown has been extended in containment zones, relaxations outside containment zones include reopening of religious places for public  from June 8. 

Hotels, restaurants and shopping malls also to open from June 8. Decision on opening educational institutions to be taken in July.
 

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News Network
March 19,2020

Rome, Mar 19: Italy on Wednesday reported 475 new deaths from the novel coronavirus, the highest one-day official toll of any nation since the first case was detected in China late last year.

The total number of deaths in Italy has reached 2,978, more than half of all the cases recorded outside China, while the number of infections stood at 35,713.

The previous record high of 368 deaths was also recorded in Italy, on Sunday. The nation of 60 million has now recorded 34.2 percent of all the deaths officially attributed to COVID-19 across the world.

With the death rate still climbing despite the Mediterranean country entering a second week under an effective lockdown, officials urged Italians to have faith and to stay strong.

"They main thing is, do not give up," Italian National Institute of Health chief Silvio Brusaferro said in a nationally televised press conference.

"It will take a few days before we see the benefits" of containment measures, said Brusaferro. "We must maintain these measures to see their effect, and above all to protect the most vulnerable."

Imposed nationally on March 12, the shutdown of most Italian businesses and a ban on public gatherings are due to expire on March 25.

But school closures and other measures, such as a ban fan attendance at sporting events, are due to run on until April 3.

A top government minister hinted Wednesday that the school closure would be extended well into next month, if not longer.

The rates within Italy itself remained stable, with two-thirds of the deaths -- 1,959 in all -- reported in the northern Lombardy region around Milan, the Italian financial and fashion capital.

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