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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Agencies
June 18,2020

New Delhi, Jun 18: Vodafone Idea on Thursday told the Supreme Court that it has incurred Rs 1 lakh crore losses as it insisted it is not in a position to furnish bank guarantees.

A bench comprising Justices Arun Mishra, S. Abdul Nazeer, and M.R. Shah, taking up the adjusted gross revenue (AGR) matter through video conferencing, directed the telecom companies to submit their financial documents and books for the last 10 years.

Asking Vodafone if it was a foreign company, the bench said that how can the company say it would not furnish any bank guarantee.

"What if you fly away overnight in future without paying anything?" it asked.

Senior advocate Mukul Rohatgi, representing Vodafone Idea, denied his client is a completely foreign firm and cited before the bench its tie-ups and investments.

Vodafone owes over Rs 58,000 crore as AGR dues and so far, has paid close to Rs 7,000 crore.

Rohatgi contended before the court that the telecom company is in a tough situation, and cannot furnish any fresh bank guarantee, as profits have eluded the company in past many quarters. He submitted before the bench that Rs 15,000 crore bank guarantees are lying with the government, and his client's losses are over Rs 1 lakh crore.

"I cannot offer any more surety," he informed the bench.

Justice Mishra noted that this is public money and these dues should be recovered. "Do not tell us that you will pay if you were to make profits... the money must come," he noted.

Justice Shah observed that the telecom industry is the only industry which earned during the Covid-19 pandemic. "After all, this money will be used for public welfare", he said.

Rohatgi argued that his client would have to fold up if orders were issued to clear dues tomorrow. "11,000 employees will have to go without notice, as we cannot pay them," he added.

Senior advocate Abhishek Manu Singhvi, appearing for Bharti Airtel, contended before the court that out of Rs 21,000 crore AGR dues, the company has already deposited a sum of Rs 18,000 crore.

He argued that his client has given a bank guarantee, in excess of demand, to DoT, and supported the proposal for phased repayment of remaining AGR dues. He insisted that the company needs to sit down with the government and calculate the dues. Airtel owes Rs 25,976 crore after paying Rs 18,000 crore, as per the government.

Senior advocate Arvind Datar, representing Tata Telecom, informed the bench that his client has paid Rs 6,504 crore in AGR dues so far, and furnishing a bank guarantee may adversely impact investments in the sector.

The total AGR dues are close to Rs 1.5 lakh crore.

The top court will now take up the matter in the third week of July.

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News Network
July 1,2020

New Delhi, Jul 1: 18,653 COVID-19 cases have been reported in India in the last 24 hours, taking the country's tally of coronavirus cases to 5,85,493, informed the Union Health and Family Welfare Ministry on Wednesday.

As per the Ministry, there are presently 2,20,114 active cases in the country. The number of patients cured/discharged and migrated stands at 3,47,979.

507 deaths due to COVID-19 were reported in the last 24 hours taking the total deaths due to the virus to 17,400.

According to the ministry, Maharashtra is the worst-affected state by the virus with 1,74,761 cases including 7,855 fatalities.

Tamil Nadu is the second worst-hit state with 90,167 cases including 1,201 deaths. Meanwhile, Delhi has a total of 87,360 cases.

The Indian Council of Medical Research said that a total number of 86,26,585 tested up to June 30 of which 2,17,931 samples were tested on Tuesday.

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News Network
July 9,2020

New Delhi, Jul 9: The Central Board of Secondary Education has strongly defended its decision to drop topics like democratic rights, citizenship, federalism, secularism etc in the name of reducing the syllabus for Classes 9 to 12 due to COVID-19 pandemic. 

The board has claimed that the dropped lessons "are either being covered by the rationalised syllabus or in the Alternative Academic Calendar of NCERT".

The CBSE said it had to come up with the clarification after realizing its decision was "interpreted differently".

"The rationalisation of syllabus up to 30 per cent has been undertaken by the Board for nearly 190 subjects of class 9 to 12 for the academic session 2020-21 as a one-time measure only. The objective is to reduce the exam stress of students due to the prevailing health emergency situation and prevent learning gaps," it said.

While it has said that no questions can be asked from the reduced syllabus in the next board exams, the CBSE has also directed schools to follow alternative calendars prepared by the NCERT.

"Therefore each of the topics that have been wrongly mentioned in media as deleted have been covered under Alternative Academic Calendar of NCERT which is already in force for all the affiliated schools of the Board," it clarified.

On Wednesday, West Bengal CM Mamata Banerjee tweeted: "Shocked to know that the central Government has dropped topics like citizenship, federalism, secularism and partisan in the name of reducing CBSE course during the COVID crisis."

"We strongly object to this and appeal the HRD Ministry to ensure these vital lessons aren't curtailed at any cost," Banerjee added.

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