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
June 27,2020

LGeneva, Jun 27:: The number of confirmed coronavirus cases worldwide has risen by over 177,000 in the past 24 hours to 9.4 million and the death toll has topped 480,000, the World Health Organisation (WHO) said on Friday (local time).

On Thursday, the WHO reported 167,056 new cases and 5,336 related deaths.

The fresh daily situation report estimates the number of infections confirmed in the past 24 hours at 177,012. Further, 5,116 virus-related deaths were reported over the same period, taking the toll to 484,249.

The Americas lead the count with over 4.7 million cases, followed by Europe with more than 2.6 million.

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News Network
February 3,2020

Mumbai, Feb 3: Maharashtra Chief Minister Uddhav Thackeray, whose party severed ties with the BJP after the state elections, on Monday said that if somebody breaks a promise, "pain and anger is obvious".

"No, I did not get any shock," Thackeray said in an interview with Shiv Sena mouthpiece Saamana while talking about forming an alliance with NCP and Congress, and becoming the Maharashtra Chief Minister.

"I am a son of Shiv Sena Pramukh (Balasaheb Thackeray), several people tried to give a shock to me but they didn't succeed. This is a field where you have to accept in the beginning that there will be a bit pushing and pulling," Thackeray said.

He added that accepting the Chief Minister's post was not a shock for him and neither was it his "dream at any point of time".

"But I can say one thing for sure that I had decided to go to any level to fulfil the promise which I made to Balasaheb Thackeray. I want to further clear it that me becoming Chief Minister is not the fulfilling of the promise made to Shiv Sena Pramukh but it's just a step towards that. I will fulfil every promise which I made to my father," Uddhav Thackeray said.

"There are several types of shock. Did people like it or not, it is the important part. I have spoken on this issue (alliance with NCP and Congress) several times and even people have understood this. Making promises and keeping them are two different things. If someone breaks a promise, pain and anger is obvious," he added.

The Chief Minister said that he does not know if BJP "has come out their shock till now or not."

"But I have to say if they had kept their promise what would have happened, what a big deal had I asked for? Did I ask for stars and moon? I only asked for what was decided before Lok Sabha polls, when we decided seat distribution," he said.

He further said, "Maharashtra and the country are watching (who betrayed/shocked whom), I don't need to say much on this."

Soon after the Assembly election results, Shiv Sena demanded rotation of the chief minister's post and equal power-sharing in the state government, which was rejected by then ally BJP. The weeks of political stalemate led to the imposition of President's rule on November 13.

Firm on its demands, Sena, the second-largest party in the state, did not hesitate to cobble up with the ideological opponents -- NCP and Congress -- and was given the chief minister's post.

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Agencies
April 17,2020

New Delhi, Apr 17: The Indian Railways turned 167 years old on Thursday and for the first time ever, its trains did not carry any passengers on its birthday and instead stood idle in the yards waiting for the nationwide lockdown to end.

On this day 167 years ago, the wheels of the first passenger train in the country from Mumbai to Thane started rolling.

In 1974, Indians experienced life without trains for the first time. In May 1974 during the strike of the railways that lasted for around three weeks, drivers, station masters, guards, track staff and many others went on 'chakka jam' demanding fixed working hours for train drivers and an across-the-board pay hike.

"I can recall those times vividly. I remember that our leader George Fernandes had almost secured a deal with the then railway minister, but it fell through when it was taken to the then Prime Minister Indira Gandhi," All India Railwaymens Federation General Secretary Shiv Gopal Mishra, who was an apprentice in the railways at that time, told PTI.

"Fernandes was arrested in Lucknow. The workers went through a lot at that time. But those were days that angry workers had refused to give in and took great risks to get their demands met," he said.

However, just like this time, four decades ago too freight trains carrying essential supplies were run and the unions agreed to let some passenger trains run on the trunk routes like the Kalka Mail from Howrah to Delhi.

"Never ever in its history, there has been such a long interruption of services. Not during the World Wars, not during the 1974 railway strike, or any other national calamity or natural disaster," a railway spokesperson said.

The first Indian Railways passenger train was flagged off on April 16, 1853, from Mumbai to nearby Thane.

On Thursday, the Railway Ministry wished the railways a happy birthday on Twitter - "Today, 167 years ago with the zeal of 'never to stop' the wheels of the first passenger train from Mumbai to Thane started rolling. For the first time, passenger services are stopped for your safety. Stay indoors & make the nation victorious," it said.

Railway has suspended all passenger services since March 25 till May 3 due to the coronavirus outbreak. Around 15,523 trains run by the railways have been affected including 9,000 passenger trains and 3,000 mail express services which are run daily. It caters to over 20 million passengers every day.

According to the Union health ministry, the death toll due to coronavirus rose to 414 and the number of cases to 12,380 in the country on Thursday.

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