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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
August 8,2020

The Kozhikode International Airport located at Karipur is not safe for the landing of flights in rainy season, according to an air-safety expert, who had warned the aviation ministry and the civil aviation regulator about this in 2011. 

The warning was particularly about the dangers of permitting passenger aircraft to land on runway 10 of the airport during rains and unfavourable wind conditions. 

Nine years later, on August 7, 2020, the warning became a reality when an Air India Express pilots landed in tailwind conditions and the aircraft overshot the tabletop runway to drop off the end and crash.

 “An aircraft landing on runway 10 in tailwind will experience poor braking action due to heavy rubber deposits … All such flights … are endangering the lives of all on board,’’ said Capt Mohan Ranganathan, in a letter sent on June 17, 2011 to then director general of civil aviation Bharat Bhushan and Nasim Zaidi, chairman of a civil aviation safety advisory committee, which was formed after the May 2010 Mangaluru air crash which killed 158 people.

“My warning issued after the Mangaluru crash was ignored. It is a table-top runway with a down slope. The buffer zone at the end of the runway is inadequate,” Capt Ranganathan said. Given the topography, he pointed out, the airport should have a buffer of 240m at the end of the runway, but it only has 90m (which the DGCA had approved). “Moreover, the space on either side of the runway is only 75m instead of the mandatory 100m,” he added.

Capt Ranganathan said there is no guideline for operations on a table-top runway when it is raining. “Runway 10 approach should not be permitted in view of the lack of runway end safety area (RESA) and the terrain beyond the end of the runway. RESA of 240m should be immediately introduced and runway length has to be reduced to make the operations safe,” his letter said.

If an aircraft is unable to stop within the runway, there is no RESA beyond the end. The ILS localiser antenna is housed on a concrete structure and the area beyond is a steep slope. “The Air India Express accident in Mangalore should have alerted AAI to make the runway conditions safe. We have brought up the issue of RESA during the initial Casac-sub group meetings. We had specifically mentioned that the declared distances for both runways have to be reduced in order to comply with ICAO Annex 14 requirement,” Capt Ranganathan said.

He said the condition of the runway strip was known to DGCA teams that have been conducting inspection and safety assessments. “Have they considered the danger involved? Did the DGCA or the airlines lay down any operational restrictions or special procedures?”

The letter also refers to Approach and Landing Accident Reduction (ALAR) training, which is supposed to be mandatory before every monsoon, but airlines don’t follow it, he said. “70% of accidents take place during approach and landing and that is why this training is essential,” he added.

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News Network
February 1,2020

Washington, Feb 1: The Indian economy experienced some abrupt slowdown in 2019 due to turbulence in non-banking financial institutions and major reform measures such as GST and demonetisation, but it is not in a recession, IMF Managing Director Kristalina Georgieva has said.

"The Indian economy indeed has experienced an abrupt slowdown in 2019. We had to revise our growth projections, downwards to four percent for last year. We are expecting 5.8 per cent (growth rate) in 2020 and then an upward trajectory to 6.5 percent in 2021," Georgieva told a group of foreign journalists here on Friday.

"It appears that the main reason for this slowdown was the non-banking financial institutions experiencing a turbulence," she said on the eve of Union Finance Minister Nirmala Sitharaman presenting the annual budget in Parliament on Saturday.

She said India had undertaken some important reforms that over the longer term would be beneficial for the country, but they do have some short-term impact.

"For example, coming with the unified tax system, and the demonetisation that took place. These are steps that over time are beneficial, but of course they might, might be somewhat disruptive over short term," Georgieva said in response to a question.

The International Monetary Fund (IMF) Managing Director said that there is not a lot of fiscal space in India. “But we also recognise that the policies of the government on that side, on the fiscal side have been prudent. We will see how the reading of the budget, the submission of the budget goes, tomorrow,” she said.

In the medium-term, she said, the IMF remains optimistic about India. “This is why we see that upswing potential for the growth in the country,” she said.

Georgieva said that the current economic slowdown cannot be described as a recession. "No.... You're far from that. But it is a significant slowdown, not the recession," she said.

The IMF managing Director noted that the consumption in India also slowed down and that contributed to the overall slowdown in the economy. The IMF would be keen to see what India does to get relatively sound macroeconomic fundamentals to pay off in terms of better growth trajectory, she said ahead of the budget.

One thing that is important for India is that budgetary revenue have been below target. "The country knows that. The finance minister knows it. They need to increase budgetary revenue collection so they can improve their fiscal position. I said it's tight on the spending side, but I also want to stress that there is room to improve collection on the revenue side," she said.

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News Network
February 10,2020

Hyderabad, Feb 10: All India Majlis-e-Ittehadul Muslimeen (AIMIM) chief Asaduddin Owaisi continued his tirade against PM Modi and Amit Shah against Citizenship Amendment Act (CAA), National Population Register (NPR) and National Register of Citizens (NRC). "We are ready to take bullets in our chests but we will not show our papers.

We are ready to take bullets in our chests as we love our country," Owaisi said further.

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