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.

Add new comment

  • Coastaldigest.com reserves the right to delete or block any comments.
  • Coastaldigset.com is not responsible for its readers’ comments.
  • Comments that are abusive, incendiary or irrelevant are strictly prohibited.
  • Please use a genuine email ID and provide your name to avoid reject.
News Network
June 23,2020

Jun 23: US President Donald Trump has issued a proclamation to suspend issuing of H-1B visas, which is popular among Indian IT professionals, along with other foreign work visas for the rest of the year.

Trump said the step was essential to help millions of Americans who have lost their jobs due to the current economic crisis.

Issuing the proclamation ahead of the November presidential elections, Trump has ignored the mounting opposition to the order by various business organisations, lawmakers and human rights bodies.

The proclamation that comes into effect on June 24, is expected to impact a large number of Indian IT professionals and several American and Indian companies who were issued H-1B visas by the US government for the fiscal year 2021 beginning October 1.

They would now have to wait at least till the end of the current year before approaching the US diplomatic missions to get stamping. It would also impact a large number of Indian IT professionals who are seeking renewal of their H-1B visas.

“In the administration of our Nation's immigration system, we must remain mindful of the impact of foreign workers on the United States labour market, particularly in the current extraordinary environment of high domestic unemployment and depressed demand for labour,” said the proclamation issued by Trump.

In his proclamation, Trump said that the overall unemployment rate in the United States nearly quadrupled between February and May of 2020 -- producing some of the most extreme unemployment rates ever recorded by the Bureau of Labor Statistics.

While the May rate of 13.3 percent reflects a marked decline from April, millions of Americans remain out of work.

The proclamation also extends till the end of the year his previous executive order that had banned issuing of new green cards of lawful permanent residency.

Green card holders, once admitted pursuant to immigrant visas, are granted "open-market" employment authorisation documents, allowing them immediate eligibility to compete for almost any job, in any sector of the economy, he said.

“American workers compete against foreign nationals for jobs in every sector of our economy, including against millions of aliens who enter the United States to perform temporary work. Temporary workers are often accompanied by their spouses and children, many of whom also compete against American workers,” Trump said.

“Under ordinary circumstances, properly administered temporary worker programmes can provide benefits to the economy. But under the extraordinary circumstances of the economic contraction resulting from the COVID-19 outbreak, certain non-immigrant visa programmes authorising such employment pose an unusual threat to the employment of American workers,” he said.

For example, Trump said, between February and April of 2020, more than 17 million United States jobs were lost in industries in which employers are seeking to fill worker positions tied to H-2B nonimmigrant visas.

“During this same period, more than 20 million United States workers lost their jobs in key industries where employers are currently requesting H-1B and L workers to fill positions,” he said.

“Also, the May unemployment rate for young Americans, who compete with certain J non-immigrant visa applicants, has been particularly high -- 29.9 percent for 16-19-year-olds, and 23.2 percent for the 20-24-year-old group,” he said.

“The entry of additional workers through the H-1B, H-2B, J, and L non-immigrant visa programmes, therefore, presents a significant threat to employment opportunities for Americans affected by the extraordinary economic disruptions caused by the COVID-19 outbreak,” Trump said.

Trump observed that excess labour supply is particularly harmful to workers at the margin between employment and unemployment -- those who are typically "last in" during an economic expansion and "first out" during an economic contraction.

In recent years, these workers have been disproportionately represented by historically disadvantaged groups, including African Americans and other minorities, those without a college degree, and Americans with disabilities, he said.

The proclamation suspends and limits entry into the US of H-1B, H-2B and L visas and their dependents till December 31, 2020. It also includes certain categories of J visas like an intern, trainee, teacher, camp counselor, or summer work travel programme.

The new rule would apply only to those who are outside the US, do not have a valid non-immigrant visa and an official travel document other than a visa to enter the country.

According to the proclamation, it does not have an impact on lawful permanent residents of the United States and foreign nationals who are spouses or child of an American citizen.

Foreign nationals seeking to enter the US to provide temporary labour or services essential to the food supply chain are also exempted from the latest proclamation.

Comments

Add new comment

  • Coastaldigest.com reserves the right to delete or block any comments.
  • Coastaldigset.com is not responsible for its readers’ comments.
  • Comments that are abusive, incendiary or irrelevant are strictly prohibited.
  • Please use a genuine email ID and provide your name to avoid reject.
Agencies
May 31,2020

Minneapolis, May 31: The full Minnesota National Guard was activated for the first time since World War Two after four nights of civil unrest that has spread to other U.S. cities following the death of George Floyd, a black man shown on video gasping for breath as a white Minneapolis policeman knelt on his neck.

Minnesota Governor Tim Walz said the deployment was necessary because outside agitators were using protests over Monday’s death of George Floyd to sow chaos and that he expected Saturday night’s demonstrations to be the fiercest so far.

From Minneapolis to several other major cities including New York, Atlanta and Washington, protesters clashed with police late on Friday in a rising tide of anger over the treatment of minorities by law enforcement.

“We are under assault,” Walz, a first-term governor elected from Minnesota’s Democratic-Farmer-Labor Party, told a briefing on Saturday. “Order needs to be restored. ... We will use our full strength of goodness and righteousness to make sure this ends.”

He said he believed a “tightly controlled” group of outsiders, including white supremacists and drug cartel members, were instigating some of the violence in Minnesota’s largest city, but he did not give specific evidence of this when asked by reporters.

As many as 80% of those arrested were from outside the state, Walz said. But detention records show just eight non-Minnesota residents have been booked into the Hennepin County Jail since Tuesday, and it was unclear whether all of them were arrested in connection with the Minneapolis unrest.

The Republican Trump administration suggested civil disturbances were being orchestrated from the political left.

“In many places, it appears the violence is planned, organized and driven by anarchic and left extremist groups - far-left extremist groups ... many of whom travel from outside the state to promote violence,” U.S. Attorney William Barr said in a statement.

In an extraordinary move, the Pentagon said it put military units on a four-hour alert to be ready if requested by Walz to help keep the peace.

Activists staged another round of protests on Saturday in at least a dozen major U.S. cities coast to coast, including Seattle, Los Angeles, Chicago, Cleveland, Dallas, Atlanta, New York and Atlanta.

In the nation’s capital, hundreds of demonstrators assembled near the Justice Department headquarters, then marched toward the U.S. Capitol, chanting, “Black lives matter,” and “I can’t breathe,” a rallying cry echoing Floyd’s dying words.

Many later ended up near the White House, where they faced off with shield-carrying police, some mounted on horseback.

The streets of Minneapolis were largely quiet during daylight on Saturday, though several National Guard armoured personnel carriers were seen rolling through town.

On Friday, in defiance of a newly imposed curfew, Minneapolis protesters took to the streets for a fourth night - albeit in smaller numbers than before - despite the announcement hours earlier of murder charges filed against Derek Chauvin, the policeman seen in video footage kneeling on Floyd’s neck.

Three other officers fired from the police department with Chauvin on Tuesday are also under criminal investigation in the case, prosecutors said.

The video of Floyd’s arrest - captured by an onlooker’s cellphone as he repeatedly groaned, “please, I can’t breathe” before becoming motionless - triggered an outpouring of rage that civil rights activists said has long simmered in Minneapolis and cities across the country over persistent racial bias in the U.S. criminal justice system.

‘PAINS ME SO MUCH’

The mood was sombre on Saturday in the Minneapolis neighbourhood of Lyndale, where dozens of people surveyed the damage while sweeping up broken glass and debris.

“It pains me so much,” said Luke Kallstrom, 27, a financial analyst, standing in the threshold of a fire-gutted post office. “This does not honour the man who was wrongfully taken away from us.”

Some of Friday’s most chaotic scenes were in the New York City borough of Brooklyn, where police armed with batons and pepper spray made more than 200 arrests in sometimes violent clashes. Several officers were injured, police said.

In Washington, President Donald Trump said on Saturday that if protesters who gathered the night before in Lafayette Square, across from the White House, had breached the fence, “they would have been greeted with the most vicious dogs, and most ominous weapons, I have ever seen.”

CHAOS IN ATLANTA

In Atlanta, Bernice King, the youngest daughter of slain civil rights icon Martin Luther King Jr., urged people to go home on Friday night after more than 1,000 protesters marched to the state capitol and blocked traffic on an interstate highway.

The demonstration turned violent at points. Fires burned near the CNN Center, the network’s headquarters, and windows were smashed at its lobby. Several vehicles were torched, including at least one police car.

Rapper Killer Mike, in an impassioned speech flanked by the city’s mayor and police chief, also implored angry residents to stay indoors and to mobilize to win at the ballot box.

“But it is not time to burn down your own home.”

Floyd, a Houston native who had worked security for nightclubs, was arrested on suspicion of trying to pass counterfeit money at a store to buy cigarettes on Monday evening. Police said he was unarmed. An employee who called for help had told a police dispatcher that the suspect appeared to be intoxicated.

In a striking coincidence, Floyd and Chauvin had both worked security at the same Latin nightclub in Minneapolis, though it was unlikely they ever interacted, former owner Maya Santamaria, who sold the El Nuevo Rodeo club in January, told Reuters.

Santamaria said Floyd worked inside the club on certain nights, supporting other staff with security. She said Chauvin, who worked outside the club as an off-duty cop for 16 years, had a reputation for roughing up customers, but she considered him responsible and a friend.

Comments

Add new comment

  • Coastaldigest.com reserves the right to delete or block any comments.
  • Coastaldigset.com is not responsible for its readers’ comments.
  • Comments that are abusive, incendiary or irrelevant are strictly prohibited.
  • Please use a genuine email ID and provide your name to avoid reject.
News Network
May 24,2020

New Delhi, May 24: Overwhelmed by the donations that poured in from the society for his help, Phool Mia, the fruit seller in north Delhi's Jagatpuri area whose mangoes were looted by the ordinary people, said that those who helped him have made his "Eid" and have shown that "humanity is still alive".

Video footage that went viral on social media, shows that scores of passers-by looted the unattended crates of mangoes of a fruit seller after a fight broke out in the neighbourhood. The incident took place on Wednesday.

"My stock of mangoes worth Rs 30,000 was kept there. Some persons were fighting with each other fearing which I left the place to avoid any sort of altercation. When I returned, I saw that they were looting the mangoes kept there. There were 50-100 people who were involved in this act," Phool Mia, narrated the ordeal.

"A video got viral about the incident after which people donated to me on a portal. They empathised with me when I was ruined. I thank the media and all those people who have donated from the bottom of my heart as they made my Eid. Now, I would be able to celebrate Eid with my children. This shows humanity is still alive," he added.

However, four people have been arrested on the basis of video footage, Delhi Police said.

Comments

Add new comment

  • Coastaldigest.com reserves the right to delete or block any comments.
  • Coastaldigset.com is not responsible for its readers’ comments.
  • Comments that are abusive, incendiary or irrelevant are strictly prohibited.
  • Please use a genuine email ID and provide your name to avoid reject.