Ummid Assistant

Delhi University launches web chat facility for admission seekers

Samsung to offer scholarships to IIM-A students

Welcome Guest! You are here: Home » Science & Technology

Astronomers discover earliest ever black holes

Friday June 17, 2011 10:24:29 AM, IANS

New Delhi: Scientists from prestigious Yale University of the US have discovered the earliest black holes ever detected, a statement from the university said Thursday.

The scientists published in their paper that the earliest giant black holes ever detected were found hidden from view by their host galaxies.

"This finding tells us there is a symbiotic relationship between black holes and their galaxies that has existed since the dawn of time," said Kevin Schawinski, a Yale astronomer, who contributed to the discovery.

According to Schawinski, only the most high-energy X-rays were detected, meaning the black holes must be hidden behind large quantities of dust and gas from their host galaxies.

"This explains why they were so difficult to find," he said.

The team used a technique called "stacking" in order to detect the incredibly weak signals emitted by the galaxies' central black holes, the farthest of which are 13 billion light years from Earth. Because of their great distance, astronomers see these black holes as they existed less than one billion years after the Big Bang.

The universe is currently estimated to be about 13.7 billion years old.

"The astronomers focused on more than 250 galaxies, which had previously been detected by the Hubble Space Telescope and which they thought were good candidates for harbouring black holes at their centers," the official university statement said.

"They then piled multiple images taken by the orbiting Chandra X-Ray Observatory on top of each other, essentially multiplying the weak X-ray signals created by the black holes as they devoured nearby gas and dust," it read.

Theorists, including Yale cosmologist Priyamvada Natarajan, used the observations to determine that even these earliest black holes appear to grow and evolve along with their host galaxies, which is similar to what astronomers have observed in the nearby universe.

"These observations indicate that extremely massive black holes already existed as early as 700-800 million years after the Big Bang, which suggests that either they were born massive to start with, or they experienced rapid growth burst," Natarajan said.

"Either scenario tells us much more than we previously knew, which is very exciting," she said.

Other authors of the paper include Ezequiel Treister (University of Hawaii and Universidad de Concepcion from Chile), Marta Volonteri (University of Michigan) and Eric Gawiser (Rutgers University).




  Bookmark and Share                                          Home | Top of the Page



Note: By posting your comments here you agree to the terms and conditions of

Comments powered by DISQUS




Top Stories

Lokpal debate collapses amid acrimony

The two-month dialogue between the government and the civil society for an effective Lokpal bill collapsed Thursday amid acrimony, with Gandhian Anna Hazare announcing another fast here from Aug 16 and  »

Hazare threatens another fast from Aug 16

Deadlock between Team Hazare, government continues


  Most Read

Maharashtra Education Board to declare SSC results today

The Maharashtra Education Board is all set to declare the Secondary School Certificate (SSC) results today afternoon at 01:00 PM. "The results of the eight boards across the state namely  »

Casteism versus Communalism

This is much discussed subject in Indian politics. Why I chose to write on it in “Secular Perspective”? Recently on internet a discussion was raging that all those police officers who are going against Modi in Gujarat are upper caste Hindus and not Dalits or OBCs. Perhaps the idea was being conveyed was that upper castes  »


  News Pick

Narrow escape for 1,000 train passengers in Assam

A train carrying around 1,000 passengers had a miraculous escape Friday with security forces detecting a powerful bomb found inside the train at the Guwahati railway station in Assam, police said. The bomb, kept  »

Court slaps case against entire police station

A Bhopal court has registered a case against an entire police station after a man claimed he was stabbed by another person in the lockup but cops allegedly tried to pass off his wounds   »

Stop 'carrot and stick policy', Sudan urge the US administration

The Sudanese government has called on the US administration to stop its "carrot and stick policy" that it has been using in dealing with the political issues in Sudan, Xinhua reported Thursday. "The Sudanese government does  »

Welfare schemes not implemented well: NHRC chief

The state of implementation of welfare schemes in India is "not encouraging", the apex human rights panel chief and former chief justice of India K.G. Balakrishnan said Thursday said. "During the National Human  »

Former Pakistan boxer Abrar shot dead in Quetta

Pakistan's boxing community Thursday mourned the shocking murder of one of the country's most celebrated pugilists - Abrar Hussain Shah - in Quetta,   »


Picture of the Day

Humayun's Tomb, one of the country's first garden mausoleum and a Unesco World Heritage Site, is getting a makeover to resemble its original state with a unique not-for-profit private-public conservation project partnered by the Aga Khan Trust for Culture, the Dorabji Tata Trust and the Archaeological Survey of India (ASI).

(Photo: IANS)



RSS  |  Contact us

| Quick links



Subscribe to

Ummid Assistant






About us




Government Schemes










Contact us





      Disclaimer | Terms of Use | Advertise with us | Link Exchange is part of the Awaz Multimedia & Publications providing World News, News Analysis and Feature Articles on Education, Health. Politics, Technology, Sports, Entertainment, Industry etc. The articles or the views displayed on this website are for public information and in no way describe the editorial views. The users are entitled to use this site subject to the terms and conditions mentioned.

© 2010 Awaz Multimedia & Publications. All rights reserved.