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 26,2020

New Delhi, May 26: With India now in the bracket of top 10 nations worst hit by the novel coronavirus, experts have attributed the surge in cases to easing of travel restrictions and movement of migrants besides enhanced testing capacity.

According to AIIMS Director, Randeep Guleria, the present rise in cases has been reported predominantly from hotspot areas but there is a possibility of further rise in the number of COVID-19 cases in the coming few days due to increased travel.

"Those who are asymptomatic or are in presymptomatic stage will pass through screening mechanisms and may reach areas where there have been minimal or less cases," Guleria said.

He said there was a need for more intense surveillance and monitoring in areas where migrants have returned to contain the spread of the disease.

If proper social distancing and hand hygiene is not maintained at a time when people are out on roads, the coronavirus infection will transmit much faster, he said.

Guleria also noted that testing capacity has been significantly ramped up which is reflecting in the increasing number of cases being detected.

Commenting on the partial resumption of rail and road transport services and migrants returning to their native places, Dr Chandrakant S Pandav, former president of the Indian Public Health Association and Indian Association of Preventive and social medicine, said the floodgates have been opened.

"This is a classic case of creating an enabling environment for coronavirus to spread like wildfire. In the coming few days, the number will rise dramatically. While it is true that lockdown cannot go on forever, the opening up should have been in a measured, calibrated and informed manner," he said.

"Travelling leads to spread of the infection. Now, the government will have to ensure even stronger surveillance to curb the infection but if that will be done is something to be observed," he said.

The death toll due to COVID-19 rose to 4,167 and the number of cases climbed to 1, 45,380 in the country, registering an increase of 146 deaths and 6,535 cases since Monday 8 am, according to the Union Health Ministry.

Dr K K Aggarwal, President of the Confederation of Medical Association of Asia and Oceania (CMAAO), and former IMA President, said there will be a further surge in cases in the coming days if migration continues without any proper social distancing.

"Within the next ten days, the cases will cross two lakh. The very fact that number of cases was rising before the end of the third lockdown and continuing during the fourth lockdown means that people are not following physical distancing as required," he said.

"Even in the last week of May when the temperature is very high, the rising number of cases would mean that human-to-human transmission is more important than surface-to-human transmission. Normally in heat the surface-to-human transmission should have reduced the new cases by half which has not happened," Aggarwal said.

However, Professor K Srinath Reddy, president of the Public Health Foundation of India, said an increase in the number of cases reflects both an increase in testing rates and an increase in spread.

"What we need to see is the number of new tests performed per day and the number of new cases that were identified from them. That gives a better idea of the rate of spread than the total number of new cases alone.

"We also have to see if the testing criteria has remained the same between the two periods of comparison.We may open up gradually but will have to continue case detection, contact tracing and follow personal protection measures as vigorously as possible," he added.

A total of 31,26,119 samples have been tested as on May 26, 9 am and 92,528 samples have been tested in the last 24 hours, ICMR officials said.

India is the tenth most affected nation by the pandemic after the US, Russia, UK, Spain, Italy, Brazil, Germany, Turkey and France, as per the John Hopkins University data.

The country has recorded 6,088, 6,654, 6,767 and 6977 cases on May 22, 23, 24 and 25 respectively. Also, the number of RT-PCR tests for detection of COVID-19 in the country crossed the 30-lakh mark on Monday.

The first two phases of the lockdown led to 14-29 lakh COVID-19 cases being averted, while the number of lives saved in that period was between 37,000 and 78,000, the government said last Friday, citing various studies, and asserted that the unprecedented shutdown has paid "rich dividends" in the fight against the pandemic.

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Agencies
January 15,2020

New Delhi, Jan 15: A Delhi court on Wednesday granted bail to Bhim Army chief Chandrashekhar Azad in connection with the Daryaganj violence case.

The court has ordered him not to hold any protest in Delhi till February 16th.

While hearing the case, the Judge had asked Azad's counsel to read out some of his social media posts.

Advocate Mehmood Pracha, representing Azad, had on Tuesday said that the petitioner was sent to jail without any evidence in connection with anti-CAA protests in Delhi's Darya Ganj area last year.

"I think the court's comments should become a precedent for the country. The Public Prosecutor at the behest of police tried to make this a communal issue. We told the court that the government has a problem with Azad because he made the CAA-NPR-NRC an issue for everyone. 
The Court also sought evidence," Pracha told ANI after Delhi's Tis Hazari court deferred the bail plea of Azad till today.

On Wednesday, the court pulled up the Delhi Police for failing to show any evidence against Azad.

Azad was arrested on December 21 last year after he led a march from Jama Masjid against the Citizenship (Amendment) Act. He was sent to judicial custody till January 18 at Tihar jail.

The Bhim Army chief was charged with rioting, unlawful assembly and inciting the mob to indulge in violence after vandalism in Delhi's Daryaganj area.

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Agencies
August 2,2020

New Delhi, Aug 2: BCCI president Sourav Ganguly on Sunday said the Women's IPL or the Challenger series, as it is better known, is "very much on", ending speculation about the parent body not having a plan for Harmanpreet Kaur and her team.

The men's IPL will be held between September 19 and November 8 or 10 (final date yet to be locked in) in the UAE due to the surge in Covid-19 cases in India. The women's IPL will also be fit in to the schedule, according to the BCCI chief.

"I can confirm to you that the women's IPL is very much on and we do have a plan in place for the national team also," Ganguly told PTI ahead of the IPL Governing Council meeting later on Sunday.

The BCCI president, who is awaiting a Supreme Court verdict on waiver of the cooling-off period to continue in the position, did not divulge details but another senior official privy to the development said that women's Challenger will be held during the last phase of IPL like last year.

"The women's Challenger series is likely to be held between November 1-10 and there could be a camp before that," the source said.

The former India captain also said that the centrally contracted women players will have a camp which has been delayed due to the prevailing situation in the country.

"We couldn't have exposed any of our cricketers -- be it male or female to health risk. It would have been dangerous," Ganguly said.

"The NCA also remained shut because of Covid-19. But we have a plan in place and we will have a camp for women, I can tell you that," he added.

The BCCI's cricket operations team is chalking up a schedule where Indian women are likely to have two full-fledged white-ball series against South Africa and the West Indies before playing the ODI World Cup in New Zealand. 

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