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
March 12,2020

New Delhi, Mar 12: The Supreme Court told the Uttar Pradesh government on Thursday that as of now, there was no law that could back their action of putting up roadside posters of those accused of vandalism during anti-CAA protests in Lucknow.

An apex court bench refused to stay the March 9 Allahabad High Court order directing the Yogi Adityanath administration to remove the posters.

The top court, which grilled the Uttar Pradesh government for putting up such posters in public, described the plea as a matter that needed "further elaboration and consideration".

A vacation bench of justices U U Lalit and Aniruddha Bose said a "bench of sufficient strength" would consider next week the Uttar Pradesh government's appeal against the Allahabad High Court order directing the state administration to remove the posters of those accused of vandalism during anti-CAA protests.

It directed the apex court registry to put up the case file before Chief Justice of India (CJI) S A Bobde so that a "bench of sufficient strength can be constituted at the earliest to hear and consider" the case next week.

During the hearing, the bench told Solicitor General Tushar Mehta, appearing for the Uttar Pradesh government, that it was a matter of "great importance".

It asked Mehta whether the state government had the power to put up such posters.

The top court, however, said there was no doubt that action should be taken against rioters and they should be punished.

Mehta told the court that the posters were put up as a "deterrent" and the hoardings only said that these persons were liable to pay for their alleged acts during the violence.

Senior advocate A M Singhvi, appearing for former IPS officer S R Darapuri whose poster has also been affixed in Lucknow, told the bench that the state was duty-bound to show the authority of law backing its action.

He said the action of the Uttar Pradesh government amounted to a "mega blanket" approach of naming and shaming these persons without final adjudication and it was an open invitation to common men to lynch them as the posters also had their addresses and photographs.

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News Network
March 6,2020

Riyadh, Mar 6: Saudi Arabia on Thursday emptied Islam's holiest site for sterilisation over fears of the new coronavirus, an unprecedented shutdown state media said will last while the year-round Umrah pilgrimage is suspended.

The kingdom halted the pilgrimage for its own citizens and residents on Wednesday, on top of restrictions announced last week on foreign pilgrims to stop the disease from spreading.

State television relayed images of an empty white-tiled area surrounding the Kaaba -- a large black cube structure inside Mecca's Grand Mosque -- which is usually packed with tens of thousands of pilgrims.

As a "precautionary measure", the area will remain closed as long as the umrah suspension lasts but prayers will be allowed inside the mosque, state-run Saudi Press Agency cited a mosque official as saying.

Additionally, the Grand Mosque and the Prophet's Mosque in the city of Medina will be closed an hour after the evening "Isha" prayer and will reopen an hour before the dawn "Fajr" prayer to allow cleaning and sterilisation, the official added.

A group of cleaners was seen scrubbing and mopping the tiles around the Kaaba, a structure draped in gold-embroidered gold cloth towards which Muslims around the world pray.

A Saudi official told news agency the decision to close the area was "unprecedented".

On Wednesday, Saudi Arabia suspended the umrah for its own citizens and residents over fears of the coronavirus spreading to Islam's holiest cities.

The move came after authorities last week suspended visas for the umrah and barred citizens from the six-nation Gulf Cooperation Council from entering Mecca and Medina.

Saudi Arabia on Thursday declared three new coronavirus cases, bringing the total number of reported infections to five.

The umrah, which refers to the Islamic pilgrimage to Mecca that can be undertaken at any time of year, attracts millions of Muslims from across the globe annually.

The decision to suspend the umrah mirrors a precautionary approach across the Gulf to cancel mass gatherings from concerts to sporting events.

It comes ahead of the holy fasting month of Ramadan starting in late April, which is a favoured period for pilgrimage.

It is unclear how the coronavirus will affect the hajj, due to start in late July.

Some 2.5 million faithful travelled to Saudi Arabia from across the world in 2019 to take part in the hajj, which is one of the five pillars of Islam as Muslim obligations are known.

The event is a massive logistical challenge for Saudi authorities, with colossal crowds cramming into relatively small holy sites, making attendees vulnerable to contagion.

Already reeling from slumping oil prices, the kingdom risks losing billions of dollars annually from religious tourism as it tightens access to the sites.

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News Network
January 12,2020

Kolkata, Jan 12: Prime Minister Narendra Modi on Sunday said a section of the youth is being misguided about the Citizenship Amendment Act and asserted that it will not take away anybody's citizenship.

Modi also said whoever has faith in India and believes in its Constitution can become an Indian citizen.

“There are a lot of questions among the youth about the new citizenship law, and some are being misled by rumours around it... it is our duty to clear their doubts,” the PM said during an address at Belur Math in Howrah district.

“I want to make this clear again that the CAA is not about taking away anybody's citizenship, but about granting citizenship,” he added.

Modi said that some people with political interests are deliberately spreading rumours about the new citizenship law.

Lauding the youth for speaking against religious persecution of minorities, the prime minister said the energy of the country's young will form the basis of change in the 21st century. The PM is on a two-day visit to the city.

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