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 11,2020

New Delhi, Jun 11: Petrol and diesel prices on Thursday were hiked by 60 paise per litre each - the fifth straight daily increase in rates since oil PSUs ended an 82-day hiatus in rate revision.

Petrol price in Delhi was hiked to Rs 74 per litre from Rs 73.40 while diesel rates were increased to Rs 72.22 a litre from Rs 71.62, according to a price notification of state oil marketing companies.

Rates have been increased across the country and vary from state to state depending on the incidence of local sales tax or VAT.

This is the fifth daily increase in rates in a row since oil companies on Sunday restarted revising prices in line with costs, after ending an 82-day hiatus.

In five hikes, petrol price has gone up by Rs 2.74 per litre and diesel by Rs 2.83.

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Agencies
July 13,2020

New Delhi, Jul 13: The Telecom Regulatory Authority of India (TRAI) has blocked Bharti Airtel's Platinum and Vodafone Idea's RedX premium plans that offer faster data speeds and priority services to customers as both the plans were violating net neutrality norms.

The telecom watchdog has asked Bharti Airtel to explain within seven days how such a similar plan being launched does not violate the rules of net neutrality.

Vodafone Idea's RedX plan has been in the market since November 2019. They made some modifications in May 2020 and the Bharti Airtel was soon going to launch a similar plan.

According to TRAI, the higher speed for premium customers discriminate against others and violates net neutrality.

Responding to TRAI's move, Airtel spokesperson said: "We are passionate about delivering the best network and service experience to all our customers. This is why we have a relentless obsession to eliminate faults and have been consistently recognised by international agencies as the best network in terms of speed, latency and video experience."

"At the same time, we want to keep raising the bar for our post-paid customers in terms of service and responsiveness. This is an ongoing effort at our end," the spokesperson said.

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News Network
February 26,2020

Feb 26: In a midnight hearing, the Delhi High Court directed police to ensure safe passage to government hospitals and emergency treatment for those injured in the communal violence erupted in northeast Delhi over the amended citizenship law.

The court held a special hearing, which started at 12:30 am, at the residence of Justice S Muralidhar after receiving a call from an advocate explaining the dire circumstances under which the victims were unable to be removed from a small hospital to the GTB Hospital.

A bench of Justices S Muralidhar and Anup J Bhambhani directed the Delhi Police to ensure safe passage of the injured victims by deploying all resources at its command and on the strength of this order as well as to make sure they receive immediate emergency treatment if not at the Guru Teg Bahadur Hospital then at the Lok Nayak Jai Prakash Narayan Hospital (LNJP) or Maulana Azad or any other hospital.

The bench also called for a status report of compliance, including information about the injured victims and the treatment offered to them, and the matter will be heard during the day at 2:15 pm.

It said the order be communicated to the medical superintendents of the GTB and the LNJP Hospitals.

The urgent hearing was conducted after advocate Suroor Mander called the judge and sought urgent orders for safe passage of ambulances for the injured.

The Delhi Police and the government were represented through additional standing counsel Sanjoy Ghose.

During the hearing, the bench spoke over phone to doctor Anwar of the Al-hind Hospital in New Mustafabad who told the court that there were two bodies and 22 injured persons there and he had been trying to seek police assistance since 4 pm on Tuesday without success.

The court then directed the senior officials to reach to the hospital forthwith, following which they started the process of evacuating the injured to the nearest hospitals.

It also said this order be brought to the knowledge of the Delhi Police Commissioner.

Communal violence over the amended citizenship law in northeast Delhi claimed at least 18 lives till Wednesday.

On Tuesday, the violence escalated in northeast Delhi as police struggled to check the rioters who ran amok on streets, burning and looting shops, pelting stones and thrashing people.

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