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
May 11,2020

Kabul, May 11: Four back-to-back roadside bombs exploded in a northern district of Afghanistan's capital Kabul on Monday, wounding four civilians including a child, police said. Kabul police spokesman Ferdaws Faramarz said a clearance team was at the site of the attacks.

Militants have carried out several roadside bombings and rocket attacks in Kabul and other parts of the country in recent weeks, but Monday's four consecutive explosions appeared to be the first coordinated effort for some months.

The Taliban has not carried out any large attacks in the city since they signed a landmark withdrawal deal with the US in February, meant to pave the way for peace in the country. No group has claimed the attacks. The explosions come as authorities are trying to impose a lockdown in the capital to curb the spread of coronavirus in the country.

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Agencies
July 13,2020

Jaipur, July 13: Amid a deepening political crisis in Rajasthan where the number 2 leader of the Congress party Sachin Pilot has revolted, over 200 Income Tax (I-T) sleuths raided the residences and properties of two of Chief Minister Ashok Gehlot’s close confidants.

The Income Tax department has carried out searches at over a dozen locations linked to Congress leader Dharamender Rathore as well as jewellery firm owner Rajiv Arora, both of whom are considered close to Gehlot.

Officials said that the raids that are underway in Jaipur, Kota, Delhi, and Mumbai were done after a complaint of tax evasion was made. Under the scanner, they said, are transactions that were made outside the country.

The curious timing of the Income Tax department’s action against Gehlot’s aides has made the Congress accuse the sleuths of acting on the behest of the BJP.

Congress spokesperson Randeep Singh Surjewala tweeted: “After all, BJP's lawyers came on the field. The Income Tax Department started raids in Jaipur. When will ED arrive?”

The Congress is facing a cliffhanger in Rajasthan after the open rebellion by deputy chief minister Sachin Pilot, who on Sunday night claimed that he had the support of 30 MLAs and that Gehlot was leading a minority government in the state.

However, Congress leader Avinash Pande on Monday said 109 MLAs have signed a letter of support to the chief minister, well above the majority mark of 100. The party has issued a whip to all the MLAs, asking them to attend the Congress Legislature Party meeting at 10.30 am. 

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News Network
January 3,2020

Mumbai, Jan 3: The Shiv Sena on Friday targeted the Centre by questioning the "efficacy" of the 2016 surgical strike and said the perception that it would demoralise Pakistani terrorists remained an "illusion" as Indian soldiers continue to get killed in terror attacks in Kashmir.

Accusing the Modi government of boasting about how Pakistan was straightened out after the surgical strike, the Sena sought to know whether it has really happened.

It also observed that troubled borders were not good for the country's well-being.

The Sena's remarks come in the wake of the death of an Army soldier from Maharashtra, Naik Sandip Raghunath Sawant, who was killed during a counter-insurgency operation in Jammu and Kashmir on Wednesday.

"The New Year did not begin on a positive note in Kashmir. Our jawan from Satara, Sandip Sawant, attained martyrdom in Kashmir along with two other soldiers. In the last one month, seven to eight jawans from Maharashtra were killed in the line of duty. The Maha Vikas Aghadi government in Maharashtra is not responsible for this," the Sena said in an editorial in party mouthpiece 'Saamana'.

The party also questioned whether the situation in Kashmir has improved after the surgical strike and abrogation of Article 370 provisions.

The party, however, maintained that scrapping Article 370 was a good move.

India had conducted the surgical strike on September 29, 2016, across the Line of Control (LoC) as a response to a terrorist attack on an Indian Army base in Uri sector of Jammu and Kashmir earlier that month.

Without naming the Centre, the Sena alleged, "Circulating news that only the Pakistanis were getting killed in Kashmir will not change the reality as tricolour-draped bodies of Indian soldiers, like Sawant, are reaching their respective villages."

"There is a bloodshed along the Kashmir border and mounting anger among the families of martyred jawans. The perception that surgical strike will demoralise Pakistani terrorists has turned out to be an illusion. In fact, the (terror) attacks have increased," it added.

The Uddhav Thackeray-led party accused the ruling BJP of boasting about straightening out Pakistan after the surgical strike.

"But has Pakistan been really straightened out? Rather Pakistan has been indulging in ceasefire violations along the LoC every day," it added.

The Shiv Sena also questioned the government's claim that the situation in Kashmir was under control after the nullification of Article 370.

"It is good that Article 370 was scrapped. Before that, surgical strike was carried out in Pakistan. But has the situation in Kashmir improved? The terror attacks continue. It's only that there is a control in reporting (these incidents)," it said.

The Sena also alleged that there was no clarity as to what was transpiring in Kashmir after the scrapping of Article 370 and only the media reports of soldiers sacrificing their lives have been coming out from that state

In a veiled attack on the BJP, its erstwhile ally, the Sena, also accused it of exploiting the surgical strike for political gains.

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