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
June 14,2020

Kashmir, Jun 14: An Army personnel was killed and two others were injured as Pakistani troops opened fire and shelled areas along the Line of Control in Poonch district of Jammu and Kashmir, officials said on Sunday.

This is the third fatality in the Pakistani firing and shelling on forward posts and villages in the twin districts of Poonch and Rajouri this month.

The officials said the latest firing and shelling from across the border took place in Shahpur-Kerni sector on Saturday night, drawing strong retaliation by the Indian Army.

Three Indian Army personnel were injured in the Pakistani firing and were immediately evacuated to hospital, where one of them succumbed to injuries, the officials said.

They said the casualties suffered by the Pakistani Army in the retaliatory action were not known immediately.

On June 4, havaldar P Mathiazhagan fell to Pakistani firing in Sunderbani sector of Rajouri district, while on June 10, Naik Gurcharan Singh lost his life in a similar incident in Rajouri sector.

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Agencies
January 21,2020

New Delhi, Jan 21: With the IMF lowering India's economic growth estimate for the current fiscal to 4.8 per cent, senior Congress leader P Chidambaram on Tuesday claimed an attack on the world body and its chief economist Gita Gopinath by government ministers was imminent.

He also alleged that the growth figure of 4.8 per cent given by the International Monetary Fund (IMF) is after some "window dressing" and he won't be surprised if it goes even lower.

"Reality check from IMF. Growth in 2019-20 will be BELOW 5 per cent at 4.8 per cent," Chidambaram said in a series of tweets.

"Even the 4.8 per cent is after some window dressing. I will not be surprised if it goes even lower," the former finance minister said.

IMF Chief Economist Gopinath was one of the first to denounce demonetisation, he noted.

"I suppose we must prepare ourselves for an attack by government ministers on the IMF and Dr Gita Gopinath," Chidambaram said.

The IMF lowered India's economic growth estimate for the current fiscal to 4.8 per cent and listed the country's much lower-than-expected GDP numbers as the single biggest drag on its global growth forecast for two years.

In October, the IMF had pegged India economic growth at 6.1 per cent for 2019.

Listing decline in rural demand growth and an overall credit sluggishness for lowering of India forecasts, Gopinath, however, had said the growth momentum should improve next year due to factors like positive impact of corporate tax rate reduction.

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News Network
January 17,2020

Bengaluru, Jan 17: India’s latest communication satellite GSAT-30 was successfully launched from the Spaceport in French Guiana during the early hours on Friday.

In a press release, ISRO, has stated that the launch vehicle 'Ariane-5 VA-251' was blasted off from Kourou Launch Base, French Ginana at 0230 hours, carrying India’s GSA-30 and EUTELSAT KONNECT for Eutelasat, as per schedule.

The Ariane 5 upper stage in an elliptical Geosynchronous Transfer Orbit.

With a lift-off mass of 3,357 kg, GSAT-30 will provide continuity to operational services on some of the in-orbit satellites.

GSAT-30 derives its heritage from ISRO’s earlier INSAT/GSAT satellite series and will replace INSAT-4A in orbit.

“GSAT-30 has a unique configuration of providing flexible frequency segments and flexible coverage. The satellite will provide communication services to Indian mainland and islands through Ku-band and wide coverage covering Gulf countries, a large number of Asian countries and Australia through C-band," ISRO Chairman Dr K Sivan said.

Dr Sivan also said that “GSAT-30 will provide DTH Television Services, connectivity to VSATs for ATM, Stock-exchange, Television uplinking and teleport Services, Digital Satellite News Gathering (DSNG) and e-governance applications. The satellite will also be used for bulk data transfer for a host of emerging telecommunication applications.”

ISRO’s Master Control Facility (MCF) at Hassan in Karnataka took over the command and control of GSAT-30 immediately after its separation from the launch vehicle. Preliminary health checks of the satellite revealed its normal health.

In the days ahead, orbit-raising maneuvers will be performed to place the satellite in Geostationary Orbit (36,000 km above the equator) by using its onboard propulsion system.

During the final stages of its orbit raising operations, the two solar arrays and the antenna reflectors of GSAT-30 will be deployed. Following this, the satellite will be put in its final orbital configuration.

The satellite will be operational after the successful completion of all in-orbit tests.

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