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
May 11,2020

New Delhi, May 11: Former prime minister Manmohan Singh is stable and under observation at the AIIMS here after suffering reaction to a new medication and developing fever, hospital sources said on Monday.

The 87-year-old Congress leader was admitted to the hospital on Sunday evening after he complained of uneasiness. He has now been shifted out of the ICU.

The sources said that Singh had developed a reaction to a new medication and further investigation is being carried on him to rule out other causes of fever.

"Dr Manmohan Singh was admitted for observation and investigation after he developed a febrile reaction to a new medication," the sources said.

"He is being investigated to rule out other causes of fever and is being provided care as needed. He is stable and under care of a team of doctors at the Cardiothoracic Centre of AIIMS," they said.

"All his parameters are fine. He is under observation at the AIIMS," a source close to him has said.

Singh, a senior leader of the opposition Congress, is currently a Member of Rajya Sabha from Rajasthan. He was the prime minister between 2004 and 2014.

In 2009, Singh underwent a successful coronary bypass surgery at the AIIMS. A number of leaders expressed have expressed concern over his health and wished him a speedy recovery.

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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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News Network
March 9,2020

Kolkata, Mar 9: A diabetic man died in the isolation ward of a hospital in West Bengal's Murshidabad on Sunday, a day after he was admitted there with suspected symptoms of coronavirus following his return from Saudi Arabia.

According to doctors, he was admitted to the hospital with fever, cough and cold.

Though test results of his blood and swab samples for novel coronavirus were awaited, it can be said that he died probably of diabetes, Director of Health Services Ajay Chakraborty told PTI.

"The man was highly diabetic and was on insulin. He returned home from Saudi Arabia and had no money to take insulin for the last three to four days.

"He was also suffering from fever, cough and cold. He was admitted to the isolation ward of the Murshidabad Medical College and Hospital yesterday and died today," the health services director said.

"We are waiting for the results of medical tests. The possibility of his death due to novel coronavirus infection is remote," he said.

However, precautions will be taken during the last rites of the victim according to the directives set by the central and state governments for patients who die of the virus, another senior official said.

"Family members will not be allowed to touch the body since the man had been suffering from cough and breathlessness. Those performing his last rites will be given protective gear, masks and gloves. Though test results are yet to be known, we do not want to take any chance," he said.

Meanwhile, the state health department has issued a directive to all private medical facilities to create a system for assessing all patients at admission allowing early recognition of possible COVID-19 infection and immediate isolation of patients with suspected novel coronavirus infection in an area separate from other patients.

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