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
July 9,2020

New Delhi, Jul 9: India reported the highest single-day spike of 24,879 new positive cases and 487 deaths in the last 24 hours, taking the total number of COVID-19 cases in the country to 7,67,296, according to the Union Ministry of Health and Family Welfare.

Out of the total number of cases, 2,69,789 are active, 4,76,378 have been cured/discharged/migrated and 21,129 have died.

Maharashtra remains the worst-affected state due to COVID-19 with as many as 2,23,724 cases, including 91,084 active, 1,23,192 cured/discharged and 9,448 deaths.

It is followed by Tamil Nadu (1,22,350) and Delhi (1,04,864).

Meanwhile, a total of 1,07,40,832 samples have been tested for COVID-19 till July 8. Of these, 2,67,061 samples were tested yesterday, stated Indian Council of Medical Research (ICMR).

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Agencies
July 29,2020

Dubai, Jul 29: Muslim pilgrims on Wednesday begin the annual Haj, downsized this year as the Saudi hosts strive to prevent a coronavirus outbreak during the five-day pilgrimage.

The Haj, one of the five pillars of Islam and a must for able-bodied Muslims at least once in their lifetime, is usually one of the world's largest religious gatherings.

But this year only up to 10,000 people already residing in the Kingdom will participate in the ritual, a tiny fraction of the 2.5 million pilgrims from around the world that attended last year.

"There are no security-related concerns in this pilgrimage, but (downsizing) is to protect pilgrims from the danger of the pandemic," said Khalid bin Qarar Al Harbi, Saudi Arabia's director of public security.

Pilgrims will be required to wear masks and observe social distancing during a series of religious rites that are completed over five days in the holy city of Makkah and its surroundings in western Saudi Arabia.

Those selected to take part in the Haj were subject to temperature checks and placed in quarantine as they began trickling into Makkah at the weekend.

State media showed health workers sanitising their luggage, and some pilgrims reported being given electronic wristbands to allow authorities to monitor their whereabouts.

Workers, clutching brooms and disinfectant, were seen cleaning the area around the Kaaba, the structure at the centre of the Grand Mosque draped in gold-embroidered cloth towards which Muslims around the world pray.

Haj authorities have cordoned off the Holy Kaaba this year, saying pilgrims will not be allowed to touch it, to limit the chances of infection.

They also reported setting up multiple health facilities, mobile clinics and ambulances to cater to the pilgrims.

Saudi authorities said only around 1,000 pilgrims residing in the Kingdom would be permitted for the Haj. Some 70 per cent of the pilgrims are foreigners residing in the Kingdom, while the rest will be Saudi citizens, authorities said.

All worshippers were required to be tested for coronavirus before arriving in the holy city of Makkah and will also have to quarantine after the pilgrimage as the number of cases in the Kingdom nears 270,000.

They were given elaborate amenity kits that include sterilised pebbles for a stoning ritual, disinfectants, masks, a prayer rug and the Ihram, a seamless white garment worn by pilgrims, according to a Haj ministry programme document.

"I did not expect, among millions of Muslims, to be blessed with approval," Emirati pilgrim Abdullah Al Kathiri said in a video released by the Saudi media ministry.

"It is an indescribable feeling... especially since it is my first pilgrimage."

The Haj ministry said non-Saudi residents of the Kingdom from around 160 countries competed in the online selection process but it did not say how many people applied.

Despite the pandemic, many pilgrims consider it safer to participate in this year's ritual without the usual colossal crowds cramming into tiny religious sites, which make it a logistical nightmare and a health hazard.

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News Network
May 12,2020

New Delhi, May 12: Former Prime Minister Manmohan Singh, who was admitted to the AIIMS here after suffering reaction to a new medication, was discharged on Tuesday.

The 87-year-old Congress leader was discharged around 12:30 pm, hospital sources said.

Manmohan Singh was shifted to a private ward in the Cardio-Neuro tower on Monday night. He was also tested for Covid-19 and his results had come out negative, the sources said. The Congress leader was admitted to the hospital on Sunday evening after he complained of uneasiness.

The sources said that Singh had developed a reaction to a new medication and was admitted to AIIMS for observation and investigation.

Manmohan Singh is currently a Member of Rajya Sabha from Rajasthan. He was the prime minister between 2004 and 2014.

In 2009, Singh underwent a successful coronary bypass surgery at the AIIMS.

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