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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News Network
January 13,2020

New Delhi, Jan 13: The Jawaharlal Nehru University Students' Union (JNUSU) has alleged that the varsity administration has blocked the registration of 300 students on the basis of 'fake Proctor inquiries'.

The union had on Saturday asked students of the university to pay their academic tuition fee but not the hiked hostel fee.

"Today the Vice Chancellor first blocked the fee payment portal and then blocked the payment of tuition fees. It is clear that the VC was lying through the teeth when he said students want to register but are not being allowed to by protesters," JNUSU president Aishe Ghosh said.

She said the VC has also blocked the registration of 300 students based on fake proctor enquiries which are not even completed.

"The truth is that it is the administration which does not want students to register and is blocking their registration," she said.

JNUSU vice president Saket Moon said that in the meetings held in HRD ministry, it was decided that the administration would take a lenient view on the students' protest and not take action against them.

He said many students, who opened the portal for registration found they had been academically suspended and could not register.

He said the JNUSU had softened its stand by saying that they would register by paying the old fees but that has been kept on hold.

On Sunday, the administration extended the date for the winter semester registration till January 15.

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News Network
March 19,2020

New Delhi, Mar 19: The total number of reported novel coronavirus cases in India has climbed to 169, with 30 fresh cases reported from various parts of the country on Wednesday.

The total cases in India include 25 foreign nationals and the three persons who died in Delhi, Karnataka and Maharashtra.

As coronavirus cases continue to rise in India, over 5,700 people, who had come in contact with positive cases, continue to be under rigorous surveillance, the government has said.

Maharashtra has 43 cases, including 3 foreigners, while Kerala has recorded 27 cases which include two foreign nationals. A 28-year-old woman from Pune with a travel history to France and the Netherlands tested positive for Covid-19, a senior official said on Wednesday.

A 68-year-old woman has tested positive for coronavirus in Mumbai. She was in close contact with a Covid-19 patient, who was diagnosed yesterday.

In Rajasthan, three more have tested positive for Covid-19. The new cases have come from Jhunjhunu district. Their samples have been sent to SMS Medical college.

In Maharashtra, a 21-year-old man in Pimpri Chinchwad with travel history to the Philippines, Singapore and Colombo has tested positive for coronavirus. One more person in Ratnagiri has tested positive for Covid-19.

Telangana has reported seven more confirmed coronavirus cases. All the seven are Indonesian national.

Delhi has so far reported 10 positive cases which include one foreigner while Uttar Pradesh has recorded 16 cases, including one foreigner. A man from Noida tested positive on Wednesday, taking the total number to four in Noida.

Karnataka reported two fresh cases on Wednesday, taking the number of infections to 13. The number of cases in Ladakh rose to eight and Jammu and Kashmir three. Telangana has reported six cases which include two foreigners.

One more person has tested positive for coronavirus in Kashmir. The person, with foreign travel history, has been put under isolation. He had arrived in J&K on March 16.

There will be restrictions on public transport, assembly of people and some other measures, in #Srinagar from tomorrow.

Rajasthan has also reported four cases including that of two foreigners. Tamil Nadu, Andhra Pradesh, Odisha, Uttarakhand and Punjab have reported one case each.

Tamil Nadu Health Minister C Vijayabaskar has confined the state's second positive case of coronavirus in the state.

The health minister has stated that the condition of the patient is stable and is in observation.

In Haryana, there are 16 cases, which include fourteen foreigners.

According to the Union ministry's data, 14 people have been discharged so far, including the three patients from Kerala.

Three persons infected with the virus have died so far, the latest casualty being a 64-year-old man from Mumbai with a travel history to Dubai who succumbed on Tuesday.

While a 76-year-old man from Kalaburagi who returned from Saudi Arabia died last Tuesday, a 68-year-old woman in Delhi who had tested positive for coronavirus passed away on Friday night.

The government on Tuesday banned the entry of passengers from Afghanistan, Philippines and Malaysia to India with immediate effect, according to an additional travel advisory.

With coronavirus cases swelling in the country, the government has also banned the entry of passengers from the European Union countries, Turkey and the UK from March 18 till March 31.

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News Network
March 5,2020

Washington, Feb 5: Experts warned a US government panel last night that India's Muslims face risks of expulsion and persecution under the country’s new Citizenship Amendment Act (CAA) which has triggered major protests.

The hearing held inside Congress was called by the US Commission on International Freedom, which has been denounced by the Indian government as biased.

Ashutosh Varshney, a prominent scholar of sectarian violence in India, told the panel that the law championed by prime minister Narendra Modi's government amounted to a move to narrow the democracy's historically inclusive and secular definition of citizenship.

"The threat is serious, and the implications quite horrendous," said Varshney, a professor at Brown University.

"Something deeply injurious to the Muslim minority can happen once their citizenship rights are taken away," he said.

Varshney warned that the law could ultimately lead to expulsion or detention -- but, even if not, contributes to marginalization.

"It creates an enabling atmosphere for violence once you say that a particular community is not fully Indian or its Indianness in grave doubt," he said.

India's parliament in December passed a law that fast-tracks citizenship for persecuted non-Muslim minorities from neighboring countries.

Responding to criticism at the time from the US commission, which advises but does not set policy, India's External Affairs Ministry said the law does not strip anyone's citizenship and "should be welcomed, not criticized, by those who are genuinely committed to religious freedom."

Fears are particularly acute in Assam, where a citizens' register finalized last year left 1.9 million people, many of them Muslims, facing possible statelessness.

Aman Wadud, a human rights lawyer from Assam who traveled to Washington for the hearing, said that many Indians lacked birth certificates or other documentation to prove citizenship and were only seeking "a dignified life."

The hearing did not exclusively focus on India, with commissioners and witnesses voicing grave concern over Myanmar's refusal to grant citizenship to the Rohingya, the mostly Muslim minority that has faced widespread violence.

Gayle Manchin, the vice chair of the commission, also voiced concern over Bahrain's stripping of citizenship from activists of the Shiite majority as well as a new digital ID system in Kenya that she said risks excluding minorities.

More than 40 people were killed last week in New Delhi in sectarian violence sparked by the citizenship law.

India on Tuesday lodged another protest after the UN human rights chief, Michele Bachelet, sought to join a lawsuit in India that challenges the citizenship law's constitutionality.

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