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
January 17,2020

New Delhi, Jan 17: Deputy Chief Minister Manish Sisodia does not have any car on his name, according to information shared in the poll affidavit filed by him for Delhi elections.

In the affidavit, it is also shown that while his self-acquired immovable property remained roughly the same as in 2015. His wife's self-acquired immovable property is worth roughly about Rs 65 lakh, as per his latest affidavit.

In the papers submitted during the nomination for 2015 Delhi polls, the senior AAP leader had declared that he owned a Maruti Swift car of make 2013.

However, in his 2020 affidavit, he has mentioned "nil" in the column for motor vehicles and other means of transport.

In the affidavit submitted on Thursday, his moveable assets were declared worth Rs 4,74,888 for 2018-19, as against Rs 4,92,624 for 2013-14.

In 2015, Sisodia had informed in his affidavit that he had bought a property in Vasundhara, Ghaziabad, worth Rs 5.07 lakh in April 2001. The approximate current market value of self-acquired property in 2015 was Rs 12 lakh.

In his current affidavit, the AAP leader has mentioned the same property. However, the approximate current market value of self-acquired property in 2020 has increased to Rs 21 lakh.

In his affidavit for the 2015 polls, Sisodia had also said that his wife had purchased a property in March 2008 costing Rs 8.70 lakh. At that time, the approximate value of her self-acquired property was Rs 20 lakh.

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Agencies
June 10,2020

US dictionary Merriam-Webster will update the meaning of the word "racism" after being contacted by a Missouri black woman, who claimed the current definition fell short of including the systematic oppression of people of colour, according to media reports.

"A revision to the entry for racism is now being drafted to be added to the dictionary soon, and we are also planning to revise the entries of other words that are related to racism or have racial connotations," according to a statement of the 189-year-old dictionary shared by Kennedy Mitchum, a recent graduate of Drake University in Iowa, on her Facebook.

Mitchum, 22, emailed the dictionary last month, following the death of African American George Floyd in the custody of four Minneapolis police officers, Xinhua news agency reported.

"I kept having to tell them that definition is not representative of what is actually happening in the world," Mitchum told CNN. "The way that racism occurs in real life is not just prejudice, it's the systemic racism that is happening for a lot of black Americans."

Merriam-Webster's first definition of racism is "a belief that race is the primary determinant of human traits and capacities and that racial differences produce an inherent superiority of a particular race."

"It's not just disliking someone because of their race," Mitchum wrote in a Facebook post on Friday. "This current fight we are in is evidence of that, lives are at stake because of the systems of oppression that go hand-in-hand with racism."

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News Network
July 26,2020

New Delhi, Jul 26: India reported a spike of 48,661 coronavirus cases in the last 24 hours, said the Union Ministry of Health and Family Welfare on Sunday.

The total COVID-19 positive cases stand at 13,85,522, including 4,67,882 active cases, 8,85,577 cured/discharged/migrated, it added.
With 705 deaths in the last 24 hours, the cumulative toll reached 32,063.

Maharashtra has reported 3,66,368 coronavirus cases, the highest among states and Union Territories in the country.

A total of 2,06,737 cases have been reported from Tamil Nadu till now, while Delhi has recorded a total of 1,29,531 coronavirus cases.

According to the Indian Council of Medical Research (ICMR), 4,42,263 samples were tested for coronavirus on Saturday and overall 1,62,91,331 samples have been tested so far.

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