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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Agencies
January 7,2020

Washington, Jan 7: Facebook will ban deepfake videos ahead of the US elections but the new policy will still allow heavily edited clips so long as they are parody or satire, the social media giant said Tuesday.

Deepfake videos are hyper-realistic doctored clips made using artificial intelligence or programs that have been designed to accurately fake real human movements.

In a blog published following a Washington Post report, Facebook said it would begin removing clips that were edited--beyond for clarity and quality--in ways that "aren't apparent to an average person" and could mislead people.

Clips would be removed if they were "the product of artificial intelligence or machine learning that merges, replaces or superimposes content onto a video, making it appear to be authentic," the statement from Facebook vice-president Monika Bickert said.

However, the statement added: "This policy does not extend to content that is parody or satire, or video that has been edited solely to omit or change the order of words."

US media noted the new guidelines would not cover videos such as the 2019 viral clip -- which was not a deepfake -- of House Speaker Nancy Pelosi that appeared to show her slurring her words.

Facebook also gave no indication on the number of people assigned to identify and take down the offending videos, but said videos failing to meet its usual guidelines would be removed, and those flagged clips would be reviewed by teams of third-party fact-checkers -- among them AFP.

The news agency has been paid by the social media giant to fact-check posts across 30 countries and 10 languages as part of a program starting in December 2016, and including more than 60 organisations.

Content labeled "false" is not always removed from newsfeeds but is downgraded so fewer people see it -- alongside a warning explaining why the post is misleading.

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Agencies
January 25,2020

Jammu, Jan 25: People in Jammu and Kashmir expressed happiness over the restoration of mobile data services and internet access through fixed-line across the Union Territory on Saturday.

Speaking to ANI Jitendra Sharma, a resident of Jammu said, "The government has taken a good decision. People had been facing hardship for a long period and I think it will improve further."

"It is a big relief to people. People can finish their pending work. I hope that 4G services will also be resumed soon," said a resident of Kashmir.

The internet speed is restricted to 2G only.

"Access shall be limited only to whitelisted sites and not to any social media applications allowing peer to peer communication and virtual private network applications. Directions shall be effective from January 25 and will remain in force till January 31," the statement by the government read.

Earlier on January 15, 2G services were reinstated in Jammu, Samba, Kathua, and Udhampur for white-listed sites.

The Central government had suspended the internet in the region following the abrogation of Article 370 of the Constitution on August 5 last year, which conferred special status to the erstwhile state of Jammu and Kashmir, and its bifurcation into two Union Territories -- Ladakh, and Jammu and Kashmir.

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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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