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.

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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
January 4,2020

Stockholm, Jan 4: “I’m not the kind of person who celebrates birthdays,” Greta Thunberg said as she turned 17 on Friday, marking the occasion in inimitable style - with a seven-hour hour protest outside the Swedish parliament.

The climate activist braved winter conditions in her native Stockholm to continue the weekly Friday School Strike for the Climate campaign that helped catapult her to international fame.

“I stand here striking from 8am until 3pm as usual ... then I’ll go home,” Thunberg, Time magazine’s Person of the Year for 2019, told Reuters.

“I won’t have a birthday cake but we’ll have a dinner.”

It’s been a busy 12 months for Thunberg, who crisscrossed the globe by car, train and boat - but not plane - to demand action on climate change.

“It has been a strange and busy year, but also a great one because I have found something I want to do with my life and what I am doing is having an impact,” she said.

When she was 15, Thunberg began skipping school on Fridays to demonstrate outside the Swedish parliament to push her government to curb carbon emissions. Her campaign gave rise to a grassroots movement that has gone global, inspiring millions of people to take action.

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News Network
March 3,2020

New Delhi, Mar 3: A day after two new cases of novel coronavirus that included one from Delhi were reported, the Health Ministry on Tuesday said six cases with "high-viral load" were detected during sample testing in Agra and these people have been kept in isolation. The six people had come in contact with a 45-year-old patient from Delhi, whose case came to light on Monday, and they include his family members.

According to government sources, the man, who is a resident of Mayur Vihar, had visited them in Agra.

The six have been kept in isolation at Safdarjung Hospital in Delhi and their samples are being sent to NIV, Pune for confirmation.

Contact tracing of the people who came in contact with the six is simultaneously being done through the Integrated Disease Surveillance Program (IDSP) network, the ministry said in a statement.

Sources said the patient from Mayur Vihar was shifted to a quarantine ward at Safdarjung Hospital on Sunday night.

His other family members have been asked to stay alert and look out for symptoms. One accountant, who came in contact with the man and some of his family members, was also quarantined, they said.

India on Monday reported two new cases of the novel coronavirus, one from Delhi and another one from Hyderabad. The government has stepped up its efforts to detect and check the infection which has killed 2,912 people in China.

On Monday, Rajasthan Health Minister Raghu Sharma had said that an Italian tourist tested positive for coronavirus in Jaipur.

The first sample collected from him on February 29 tested negative but his condition deteriorated, so a second sample was collected which tested positive on Monday, the minister said, adding, "Since there is a variation in the reports, the samples have been sent to the NIV, Pune for testing".

India had earlier reported three cases from Kerala, including two medical students from Wuhan in China, the epicentre of the deadly novel coronavirus. They had self-reported on their return to the country and tested positive for the infection. They were discharged from hospitals last month following recovery.

The infected person from Delhi had travelled to Italy, while the other patient who tested positive for the COVID-19 infection is from Telangana and had recently travelled to Dubai.

Both the patients had self-reported after they developed symptoms.

"They tested positive. They are stable and being closely monitored," ministry said on Monday.

The government has asked people to avoid non-essential travel to Iran, Italy, South Korea and Singapore and said India was in discussions with authorities in Iran and Italy, two countries badly affected by the infection, to evacuate Indians there.

The novel coronavirus or COVID-19, which originated in China, has spread to over 60 countries.

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News Network
May 21,2020

London, May 21: Working mothers in Europe and the United States are taking on most of the extra housework and childcare created by lockdown - and many are struggling to cope, a survey showed on Thursday.

Women with children now spend an average 65 hours a week on the unpaid chores - nearly a third more than fathers - according to the Boston Consulting Group, which questioned parents in five countries.

"Women have been doing too much household work for too long, and this crisis is pushing them to a point that's simply unsustainable," Rachel Thomas, of U.S.-based women's rights group LeanIn.Org, said in response to the data.

"We need a major culture shift in our homes and in our companies ... We should use this moment to build a better way to work and live – one that's fair for everybody."

Researchers say fallout from the pandemic weighs on women in a host of ways, be it in rising domestic violence or in lower wages, as some women cut paid work to take on the new duties.

With lockdowns shutting schools and keeping citizens at home, creating a mountain of domestic work, public campaigns from Georgia to Mexico have urged men to do their fair share.

But women, who on average already do more at home than men, are now shouldering most of the new coronavirus burden, too, said the survey of more than 3,000 working parents in the United States, Britain, Italy, Germany and France.

Women's unpaid hours at home have nearly doubled to 65 hours a week, said the survey, against 50 logged by an average father.

British women are more likely to support others in the COVID-19 pandemic and are finding it harder to stay positive, according to separate analysis released this week by polling firm Ipsos MORI and feminist organisation The Fawcett Society.

It is "no surprise" to see women do more childcare and housekeeping on top of their day jobs, Jacqui Hunt of women's rights group Equality Now, told the Thomson Reuters Foundation.

However, there are "hopeful signs" that men in West Africa are sharing more childcare during the pandemic in a shift in social norms, found a small rapid analysis by humanitarian organisation CARE International released on Wednesday.

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