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
February 24,2020

New Delhi, Feb 24: The shared values between India and the US are "discrimination, bigotry, and hostility towards refugees and asylum seekers", Amnesty International USA said in a joint statement with Amnesty International India ahead of US President Donald Trump's visit to India on Monday.

Trump, accompanied by his wife Melania, daughter Ivanka and son-in-law Jared Kushner as well as senior officials of his administration, landed in Ahmedabad on the first leg of his two-day visit to India.

"Anti-Muslim sentiment permeates the policies of both U.S. and Indian leaders. For decades, the U.S.-India relationship was anchored by claims of shared values of human rights and human dignity. Now, those shared values are discrimination, bigotry, and hostility towards refugees and asylum seekers,” Margaret Huang, Amnesty International USA’s executive director, was quoted as saying in the statement.

It was a reference to the anti-CAA protests in India, the internet lockdown in Jammu and Kashmir and the Muslim ban expansion by President Trump affecting Nigeria, Eritrea, Myanmar, Kyrgyzstan, Sudan and Tanzania, the statement said.

It added that Amnesty International USA’s researchers travelled to Lebanon and Jordan to conduct nearly 50 interviews with refugees that as a result of the previous version of the ban have been stranded in countries where they face restrictive policies, increasingly hostile environments, and lack the same rights as permanent residents or citizens.

The statement also came down hard on the Indian government, hitting out at the Citizenship (Amendment) Act (CAA) 2019 and saying it legitimises discrimination based on religious grounds.

It criticised statements such as “identify them (the protestors) by their clothes” or “shoot the traitors” by Prime Minister Modi and his party workers. Such remarks "peddled the narrative of fear and division that has fuelled further violence", it said.

“The internet and political lockdown in Kashmir has lasted for months and the enactment of CAA and the crackdown on protests has shown a leadership that is lacking empathy and a willingness to engage. We call on President Trump and Prime Minister Modi to work with the international community and address our concerns in their bilateral conversations,” Avinash Kumar, executive director, Amnesty International India said in the statement.

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News Networkwork
May 14,2020

Bengaluru, May 14: ABB India has posted a profit after tax of Rs 66 crore during the first quarter (January to March) due to lower volumes including service revenue and unfavourable mix.

In Q1 CY19, it had reported a profit after tax of Rs 89 crore. ABB India follows calendar year as its fiscal year.

The company reported a profit including exceptional items and before tax of Rs 87 crore. The resultant under-absorption and mark-to-market impact due to forex volatility were partly offset by refund incomes and a one-time gain on sale of solar business during the quarter.

Revenues for the first quarter stood at Rs 1,522 crore, impacted by lower sales, non-receipt of delivery clearance, lower service revenue in the nationwide lockdown due to the COVID-19 pandemic. This impact primarily occurred in March, the company said in a statement.

ABB India said it continues to maintain a stable cash position of Rs 1,464 crore as on March 31 in a market where cash collection continues to be a challenge.

Besides, despite many activities coming to a standstill in March, the quarter was marked by commissioning for a mining major at Raigarh in Chhattisgarh, electrical and automation systems for a cement major and port and electrics, drives and automation for a leading mill in Bangladesh.

Terminal installation and commissioning for LPG, power management electrical control system for a leading refinery and commissioning of two units of a power plant in Kerala are some of the other projects where ABB's involvement ensured continuity and safe operations, it said.

On a global scale, the impact of COVID-19, as well as the fall in oil prices, has significantly impacted the short-term outlook. The global economy is expected to contract in 2020 after a rapid deterioration in outlook driven by the pandemic.

Despite unprecedented stimuli by governments and central banks around the world and initial signs of recovering economic activity in China, macro-indicators point to a global recession of uncertain duration as many countries continue to face restrictions with anticipated long-term economic consequences, said ABB India.

While the company is taking prompt action to adapt its operations and cost base to safeguard profitability, it expects the results in the coming quarter to be impacted due to the loss of volumes.

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Agencies
July 25,2020

In a study conducted in 117 countries, researchers have found that the world is experiencing the most dramatic reduction in the seismic noise (the hum of vibrations in the planet's crust) in recorded history due to global COVID-19 lockdowns.

Measured by instruments called seismometers, seismic noise is caused by vibrations within the Earth, which travel like waves and the waves can be triggered by earthquakes, volcanoes, and bombs - but also by daily human activity like travel and industry.

This quiet period was likely caused by the total global effect of social distancing measures, closure of services and industry, and drops in tourism and travel, the study published in the journal Science, reported.

The new research, led by the Royal Observatory of Belgium and five other institutions around the world including Imperial College London (ICL), showed that the dampening of 'seismic noise' caused by humans was more pronounced in more densely populated areas.

"Our study uniquely highlights just how much human activities impact the solid Earth, and could let us see more clearly than ever what differentiates human and natural noise," said study co-author Stephen Hicks from ICL in the UK.

For the findings, the research team looked at seismic data from a global network of 268 seismic stations in 117 countries and found significant noise reductions compared to before any lockdown at 185 of those stations.

Researchers tracked the 'wave' of quietening between March and May as worldwide lockdown measures took hold.

The largest drops in vibrations were seen in the most densely populated areas, like Singapore and New York City, but drops were also seen in remote areas like Germany's the Black Forest and Rundu in Namibia.

Citizen-owned seismometers, which tend to measure more localised noise, noted large drops around universities and schools around Cornwall, UK and Boston, US - a drop in noise 20 per cent larger than seen during school holidays.

The findings showed that countries like Barbados, where lockdown coincided with the tourist season, saw a 50 per cent decrease in noise.

"The changes have also given us the opportunity to listen in to the Earth's natural vibrations without the distortions of human input," the study authors wrote.

Earlier in April, a study published in the journal Nature, reported at least a 30 per cent reduction in that amount of ambient human noise since lockdown began in Belgium.

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