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
May 27,2020

Muzaffarpur, May 27: A toddler's vain attempt to wake up his dead mother from eternal sleep on a railway platform in Bihar's Muzaffarpur on Wednesday presented the most poignant picture of the massive migrant tragedy unfolding across several states.

A video tweeted by Sanjay Yadav, an aide to RJD leader Tejashwi Yadav, shows the child walking unsteadily up to his mother's body, tugging at the blanket placed over her, and when failing to wake her up, covering his own head with it.

As the mother still lay still, he wobbles away from her, announcements continuing in the background about the arrival and departure of trains that would bring in tens of thousands of people in a rush to get away from hunger and hardship they face in large cities that could sustain them no more.

"This small child doesn't know that the bedsheet with which he is playing is the shroud of his mother who has gone into eternal sleep. This mother died of hunger and thirst after being on a train for four days. Who is responsible for these deaths on trains? Shouldn't the opposition ask uncomfortable questions?" tweeted Yadav.

However, police had a different story to tell.

Ramakant Upadhyay, the Dy SP of the Government Railway Police in Muzaffarpur, said the incident occurred on May 25 when the migrant woman was on way to Muzaffarpur from Ahmedabad by a Shramik Special train.

He told reporters the woman, who was accompanied by her sister and brother-in-law, had died on the Madhubani bound train.

"My sister-in-law died suddenly on the train. We did not face any problem getting food or water," the officer said, quoting the deceased's brother-in-law who he did not name.

He said on getting information, poice brought down the body and sent it for postmortem.

Citing the brother-in-law of the deceased, Upadhyay said she was aged 35 years and was undergoing treatment for "some disease" for the last one year in Ahmedabad. "She was also mentally unstable," he said.

When persistently queried about the cause of death, he said,"Only doctors can tell".

A massive exodus of migrant workers is on in several parts of the country, unprecedented in magnitude since Partition.

The humanitarian crisis still unfolding on highways and railway platforms has shone light on disturbing tales of entire families walking hundreds of kilometres with little children on foot in a seemingly endless march to escape hunger.

People have been found travelling on trucks and in the hollow of concrete mixing plants, and in many cases, dying from hunger and exhaustion before reaching their destinations.

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Agencies
May 22,2020

Kochi, May 22: During the nationwide COVID-19 lockdown, Kerala recorded the highest number of cyber attacks followed by Punjab and Tamil Nadu, a study by anti-virus software firm K7 Computing said on Thursday.

In a statement issued in Chennai, the company said its K7 Computing's Cyber Threat Report, a comprehensive analysis of cyber attacks during the lockdown has found that Kerala recorded the highest number of cyber attacks during this period. The report analyses various cyber attacks within India during the pandemic and reveals that threat actors targeted the state with COVID-themed attacks aimed at exploiting user trust.

In Kerala, regions like Kottayam, Kannur, Kollam, and Kochi saw the highest hits with 462, 374, 236, and 147 attacks respectively, while the state as a whole saw around 2,000 attacks during the period - the highest thus far in the country.

This was followed by Punjab with 207 attacks and Tamil Nadu with 184 attacks, the company said.

The sudden surge in the frequency of attacks witnessed from February 2020 to mid-April 2020 indicates that scamsters across the world were exploiting the widespread panic around coronavirus at both the individual and corporate level.

These attacks aimed to compromise computers and mobile devices to gain access to users' confidential data, banking details, and cryptocurrency accounts.

The key threats seen during this period ranged from phishing attacks to rogue apps disguised as COVID-19 information apps that targeted users' sensitive data. Phishing attacks were noticed more in Tier-II and Tier-III cities while the metros fared better. Smaller cities saw over 250 attacks being blocked per 10,000 users.

Users from Ghaziabad and Lucknow seem to have faced almost 6 and 4 times the number of attacks as Bengaluru users.

According to the statement, a majority of the recorded attacks were phishing attacks with sophisticated campaigns that could easily snare even the most educated users. These attacks were aimed at heightening users' fears and creating a sense of urgency to take action.

K7 Labs noticed phishing attacks where scamsters posed as representatives of the United States Department of Treasury, the World Health Organization (WHO), and the Centres for Disease Control and Prevention (CDC), the company said.

Users were encouraged to visit links that would automatically download malware on the host computer such as the Agent Tesla keylogger or Lokibot information-stealing malware, infamous banking Trojans such as Trickbot or Zeus Sphinx, and even disastrous ransomware.

Other attacks included infected COVID-19 Android apps like CoronaSafetyMask that scam users with promises of masks for an upfront payment; the spyware app Project Spy; and seemingly genuine apps that are infected with dangerous malware like banking Trojans such as Ginp, Anubis and Cerberus.

"Covid-19 has created an ideal situation for various threat actors to target individuals and enterprises alike. The panic caused by the stringent lockdown measures and rapid spread of this virus has left many people looking for more information on the situation," J. Kesavardhanan, Founder and CEO of K7 Computing was quoted as saying in the statement.

"Threat actors exploit this fear to their advantage and scam users into downloading malicious software and divulging sensitive information like banking codes. The need to be cyber cautious has never been greater. This is more so in the case of corporates who have adopted a work from home policy hurriedly without adequate cyber hygiene. We have seen an increase in attacks on enterprises and SME employees as well," he added.

Such attacks are expected to continue till normalcy returns. Social engineering attacks targeted at winning users' trust will gain momentum.

Healthcare institutions, well-known government offices, and international organisations will continue to be a prime target throughout the pandemic, the statement said.

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Agencies
February 11,2020

New Delhi, Feb 11 Congress's performance touched a record low in the Delhi Assembly election as the party bagged less than 5 per cent of the total votes polled and 63 of its candidates lost their deposits.

The party, which ruled Delhi for 15 years on the trot under former Chief Minister Sheila Dikshit, failed to open its account for the second consecutive assembly election in Delhi.

Only three of its candidates Arvinder Singh Lovely from Gandhi Nagar, Devender Yadav from Badli and Abhishek Dutt from Kasturba Nagar managed to save their deposits.

Security deposit of a candidate is forfeited if he/she fails to secure one-sixth of the total valid votes cast in a constituency.

Most of Congress candidates got less than 5 per cent of the total votes polled in their respective constituencies.

Delhi Congress chief Shubhash Chopra's daughter Shivani Chopra, who was the party candidate from Kalkaji, also could not save her deposit.

Former Delhi Assembly Speaker Yoganand Shastri's daughter Priyanka Singh also forfeited her deposit.

The party's campaign committee chairman Kirti Azad's wife, Poonam Azad, lost badly and stood fourth, polling only 2,604 (2.23) votes.

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