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
June 15,2020

New Delhi, Jun 15: On Monday, petrol and diesel prices across the country were raised for the ninth consecutive day by 48 paise and 59 paise, respectively.

Petrol price per litre was raised to Rs 76.26 in New Delhi, Rs 83.17 in Mumbai, Rs 79.96 in Chennai, Rs 79.17 in Hyderabad, Rs 78.73 in Bengaluru and Rs 78.10 in Kolkata.

Diesel price per litre was hiked to Rs 74.62 in New Delhi, Rs 73.21 in Mumbai, Rs 72.69 in Chennai, Rs 72.93 in Hyderabad, Rs 70.95 in Bengaluru and Rs 70.33 in Kolkata.

Since 7 June, after ending their 82-day hiatus in daily revision, state-owned oil marketing companies have increased petrol price by Rs 5 per litre and diesel by Rs 5.23 per litre.

These prices are close to levels last seen in October-November 2018 when international oil prices had spiked close to $80 per barrel. In October 2018, petrol price in Mumbai had crossed Rs 90-mark and in Delhi, it was around Rs 83 per litre.

Comparatively, on Monday, Brent crude, the international benchmark for crude oil prices, fell 2.3 percent to $37.84 a barrel over concerns of subdued demand for fuel as new coronavirus infections were reported in China and the US.

The present spike in fuel prices in India could be attributed to the fact that central and state governments, along with oil marketing companies are looking to make up for their loss in revenues due to the lockdown.

Last month, the central government had increased the excise duty on per litre of petrol by Rs 10 and per litre of diesel by Rs 13. Several state governments have also hiked their VAT or cess on fuel in the last month. In fact, now around 70 percent of the retail price of fuel is just some form of tax.

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Agencies
July 24,2020

New Delhi, Jul 24: Telecom companies lost 82.3 lakh subscribers during the COVID-19 lockdown period of April, data released by the Telecom Regulatory Authority of India (TRAI) on Friday showed.

As per the reports received from 342 operators in April, TRAI said the number of broadband subscribers decreased from 68.7 crore at the end of March to 67.6 crore at the end of April with a monthly decline rate of 1.64 per cent.

Top five service providers constituted 98.98 per cent market share of total broadband subscribers with Reliance Jio Infocomm (38.9 crore), Bharti Airtel (14.4 crore), Vodafone Idea (11.1 crore), BSNL (2.1 crore) and Atria Convergence (16 lakh).

The number of overall telephone subscribers decreased from 117.7 crore at the end of March to 116.9 crore at the end of April, showing a monthly decline rate of 0.72 per cent.

The TRAI said total wireless subscribers (2G, 3G and 4G) decreased from 115.7 crore at the end of March to 115 crore at the end of April, thereby registering a monthly decline rate of 0.71 per cent.

Wireless subscription in urban areas decreased from 63.8 crore to 62.9 crore but increased in rural areas from 51.9 crore to 52 crore. Monthly growth rates of urban and rural wireless subscription were minus 1.42 per cent and 0.16 per cent respectively.

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News Network
February 5,2020

Mumbai, Feb 5: Maharashtra Chief Minister Uddhav Thackeray on Wednesday said there was no need to fear the Citizenship Amendment Act, but asserted his government will not allow the proposed National Register of Citizens to be implemented as it would "impact people of all religions".

Throwing out Bangladeshi and Pakistani migrants out of the country was an old demand of the Shiv Sena, the chief minister said in the third and concluding part of his interview to party mouthpiece 'Saamana'.

"I can confidentally say the Citizenship (Amendment) Act (CAA) is not meant to throw Indian citizens out of the country. But, the National Register of Citizens (NRC) is going to impact Hindus as well," the Sena president said.

India has the right to know the number of minorities from neighbouring nations who applied for Indian citizenship after being persecuted in their home countries, he said.

"When they come here, will they get homes under the 'Pradhan Mantri Awas Yojana'? What about employment and education of their children? All these issues are important and we have the right to know," hesaid in the interview to Saamana's executive editor and Sena MP Sanjay Raut.

"As chief minister, I should know where will these people be relocated in my state. Our own people don't have adequate housing. Will these people go to Delhi, Bengaluru or Kashmir, since Article 370 is now scrapped?" he wondered.

Several Kashmiri Pandit families are staying like refugees in their own country. The CAA is not to throw citizens out of the country, Thackeray said.

"However, the NRC will impact Hindus and Muslims and the state government will not allow it to be implemented," he asserted.

Under the NRC, all citizens will have to prove their citizenship. In Assam, 19 lakh people could not prove their citizenship. Of these, 14 lakh are Hindus, Thackeray claimed.

In a veiled attack on his cousin and MNS chief Raj Thackeray, who will lead a rally in support of the CAA and NRC in Mumbai on February 9, the chief minister said the NRC is not yet a reality and there is no need for a 'morcha' in support of or against it.

"If the NRC is enforced, those who are supporting it will also be affected," he said.

Under the NRC, even Hindus will have to prove their citizenship. "I will not allow the law to be enacted. Whether I am chief minister or not, I will not allow injustice to anybody," he said.

The chief minister also took a veiled dig at the Centre's decision to give the Padma Shri award to Pakistani-origin musician Adnan Sami.

"A migrant is a migrant. You can't honour him with the Padma award. Throwing out illegal migrants was the stand of (late Shiv Sena supremo) Balasaheb Thackeray," he said without naming anyone.

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