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Astronomers discover new class of black holes.

Byline: ANI

London, July 2 (ANI): An international team of astronomers has discovered a new class of black hole, more than 500 times the mass of the Sun.

Astronomers made the finding in a distant galaxy approximately 290 million light years from Earth.

Until now, identified black holes have been either super-massive in the centre of galaxies, or about the size of a typical star (between three and 20 Solar masses).

The new discovery is the first solid evidence of a new class of medium-sized black holes.

A black hole is a remnant of a collapsed star with such a powerful gravitational field Noun 1. gravitational field - a field of force surrounding a body of finite mass
field of force, force field, field - the space around a radiating body within which its electromagnetic oscillations can exert force on another similar body not in contact with it
 that it absorbs all the light that passes near it and reflects nothing.

It had been long believed by astrophysicists An astrophysicist is a person who professionally studies and conducts research in astrophysics. Famous astrophysicists
  • Hannes Olof Gösta Alfvén (Sweden, 1908 – 1995)
  • Subrahmanyan Chandrasekhar (India, USA, 1910 – 1995)
 that there might be a third, intermediate class of black holes, with masses between a hundred and several hundred thousand times that of the Sun.

However, such black holes had not been reliably detected until now.

The team, led by astrophysicists at the Centre d'Etude Spatiale des Rayonnements in France, detected the new black hole with the European Space Agency's XMM-Newton X-ray space telescope.

"While it is widely accepted that stellar mass black holes are created during the death throes throe  
1. A severe pang or spasm of pain, as in childbirth. See Synonyms at pain.

2. throes A condition of agonizing struggle or trouble: a country in the throes of economic collapse.
 of massive stars, it is still unknown how super-massive black holes are formed," said the lead author of the research paper, Dr. Sean Farrell Sean Farrell (born May 25 1960, Southampton, New York) is a former American Football guard who played mainly for the Tampa Bay Buccaneers. Farrell played college football for Penn State University, where he was named to two All-American teams. , now based at the Department of Physics and Astronomy at the University of Leicester History
The University was founded as Leicestershire and Rutland College in 1918. The site for the University was donated by a local textile manufacturer, Thomas Fielding Johnson, in order to create a living memorial for those who lost their lives in World War I.
, UK.

"One theory is that super-massive black holes may be formed by the merger of a number of intermediate mass black holes. To ratify such a theory, however, you must first prove the existence of intermediate black holes," he added.

"This is the best detection to date of such long sought after intermediate mass black holes. Such a detection is essential. While it is already known that stellar mass black holes are the remnants of massive stars, the formation mechanisms of supermassive black holes are still unknown," said Farrell.

"The identification of HLX-1 is therefore an important step towards a better understanding of the formation of the super-massive black holes that exist at the centre of the Milky Way Milky Way, the galaxy of which the sun and solar system are a part, seen as a broad band of light arching across the night sky from horizon to horizon; if not blocked by the horizon, it would be seen as a circle around the entire sky.  and other galaxies," he added.

HLX-1 (Hyper-Luminous X-ray source 1), lies towards the edge of the galaxy ESO ESO European Southern Observatory
ESO Educación Secundaria Obligatoria (Spain: compulsory secondary education)
ESO European Organisation for Astronomical Research in the Southern Hemisphere
ESO Edmonton Symphony Orchestra

It is ultra-luminous in X-rays, with a maximum X-ray brightness of approximately 260 million times that of the Sun. (ANI)

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Publication:Asian News International
Date:Jul 2, 2009
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