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 22,2020

Jan 22: India's ranking in the latest global Democracy Index has dropped 10 places to the 51st spot out of 167 owing to violent protests and threats to civil liberties challenging freedoms across the country.

Prime Minister Narendra Modi's government has been criticized by rights groups and western governments after shutting off the internet and mobile phone networks and detaining opposition politicians in Kashmir.

Modi’s government has also responded harshly to ongoing protests against a controversial, religion-based citizenship law. Muslims have said their neighborhoods have been targeted, while the central government has attempted to ban protests and urged TV news channels not to broadcast “anti-national” content. Some leaders in Modi’s ruling party called for “revenge” against protesters. India’s score in 2019 was its worst ranking since the EIU’s records began in 2006, and has fallen gradually since Modi was elected in 2014.

The Economist Intelligence Unit’s 2019 Democracy Index, which provides an annual comparative analysis of political systems across 165 countries and two territories, said the past year was the bleakest for democracies since the research firm began compiling the list in 2006.

“The 2019 result is even worse than that recorded in 2010, in the wake of the global economic and financial crisis,” the research group said in releasing the report on Wednesday.

The average global score slipped to 5.44 out of a possible 10 -- from 5.48 in 2018 -- driven mainly by “sharp regressions” in Latin America, Sub-Saharan Africa, the Middle East and North Africa. Apart from coup-prone Thailand, which improved its score after holding an election last year, there were also notable declines in Asia after a tumultuous period of protests and new measures restricting freedom across the region’s democracies.

Asia Declines

Hong Kong, meanwhile, fell three places to rank 75th out of 167 as more than seven months of violent and disruptive protests rocked the Asian financial hub. An aggressive police response early in the unrest, when protests were mostly peaceful, led to a “marked decline in confidence in government -- the main factor behind the decline in the territory’s score in our 2019 index,” the group said.

In Singapore, which ranked alongside Hong Kong at 75th, a new “fake news” law led to a deteriorating score on civil liberties.

“The government claims that the law was enacted simply to prevent the dissemination of false news, but it threatens freedom of expression in Singapore, as it can be used to curtail political debate and silence critics of the government,” EIU analysts said.

China’s score fell to just 2.26 in the EIU’s ranking, placing it near the bottom of the list at 153, as discrimination against minorities, repression and surveillance of the population intensified. Still, in China “the majority of the population is unconvinced that democracy would benefit the economy, and support for democratic ideals is absent,” the EIU said.

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News Network
July 20,2020

The International Cricket Council (ICC) today confirmed the ICC Men’s T20 World Cup in Australia 2020 has been postponed due to the ongoing COVID-19 pandemic

At today’s meeting of the IBC Board (the commercial subsidiary of the ICC), windows for the next three ICC men’s events were also agreed to bring clarity to the calendar and give the sport the best possible opportunity over the next three years to recover from the disruption caused by COVID-19.

The windows for the Men’s events are:

1. ICC Men’s T20 World Cup 2021 will be held October – November 2021 with the final on 14 November 2021

2. ICC Men’s T20 World Cup 2022 will be held October – November 2022 with the final on 13 November 2022

3. ICC Men’s Cricket World Cup 2023 will be held in India October – November 2023 with the final on 26 November 2023

The IBC Board agreed to continue to monitor the rapidly changing situation and assess all the information available in order to make a considered decision on future hosts to ensure the sport is able to stage safe and successful global events in 2021 and 2022.

The IBC Board will also continue to evaluate the situation in relation to being able to stage the ICC Women’s Cricket World Cup 2021 in New Zealand in February next year. In the meantime, planning for this event continues as scheduled.

The Board will also continue to evaluate the situation in relation to being able to stage the ICC Women’s Cricket World Cup 2021.

ICC Chief Executive Manu Sawhney said: “We have undertaken a comprehensive and complex contingency planning exercise and through this process, our number one priority has been to protect the health and safety of everyone involved in the sport.

“The decision to postpone the ICC Men’s T20 World Cup was taken after careful consideration of all of the options available to us and gives us the best possible opportunity of delivering two safe and successful T20 World Cups for fans around the world.

“Our Members now have the clarity they need around event windows to enable them to reschedule lost bilateral and domestic cricket. Moving the Men’s Cricket World Cup to a later window is a critical element of this and gives us a better chance of maintaining the integrity of the qualification process. This additional time will be used to reschedule games that might be lost because of the pandemic ensuring qualification can be decided on the field of play.

“Throughout this process we have worked closely with our key stakeholders including governments, Members, broadcasters, partners and medical experts to enable us to reach a collective decision for the good of the game and our fans. I would like to thank everyone involved for their commitment to a safe return to cricket.”

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News Network
June 4,2020

New Delhi, Jun 4: India's Defence Secretary Ajay Kumar tested positive for COVID-19 on Wednesday, following which the defence ministry carried out a massive contact-tracing exercise, official sources said.

Kumar's condition is stable and he is currently under home-quarantine, they said.

At least 35 officials working at the ministry's headquarters in South Block in the Raisina Hills have been sent on home quarantine after reports of Kumar testing positive for the infection emerged on Wednesday morning.

There was no official comment on Kumar's health condition. The defence ministry spokesperson refused to comment on the issue.

It is learnt that Defence Minister Rajnath Singh did not attend office as part of a precautionary measure.

The offices of the defence minister, the defence secretary, the Army Chief and the Navy Chief are on the first floor of the South Block.

The sources said all laid down protocols on contact-tracing and quarantining of people are being scrupulously followed.

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