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Black Holes

From super to ultra: Just how big can black holes get?

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The black hole at the center of this galaxy is part of a survey of 18 of the biggest known black holes in the universe. This large elliptical galaxy is in the center of the galaxy cluster PKS 0745-19, which is shown in this composite image containing X-rays from Chandra (purple) and optical data from Hubble (yellow). Researchers found that some of the black holes in the survey may be about ten times more massive than previously thought. This includes ten that could weigh between 10 and 40 billion times the mass of the sun, making them "ultramassive" black holes. (Credit: X-ray: NASA/CXC/Stanford/Hlavacek-Larrondo, J. et al; Optical: NASA/STScI; Radio: NSF/NRAO/VLA)

Dec. 18, 2012 — Some of the biggest black holes...

How white dwarfs mimic black holes

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Dec. 17, 2012 — A remarkable observation by astronomers from the University of Southampton, Professor Phil Charles, Professor Malcolm Coe and postgraduate student Liz Bartlett, has appeared in The Astrophysical Journal.

The Southampton Physics and Astronomy team are part of a global collaboration -- with colleagues in Taiwan, South Africa, Poland, Australia and Italy -- that has revealed that bright X-ray flares in nearby galaxies, once assumed to indicate the presence of black...

Astronomers discover 'missing link' of black holes

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A composite image of our neighbouring galaxy, Andromeda, showing different views of the Ultraluminous X-ray (ULX) source. The background image is an optical (visible) light picture of Andromeda, with the X-ray image (bottom left) taken with the Earth-orbiting XMM-Newton X-ray telescope superimposed. Colours in the X-ray image correspond to different X-ray energies, with red being least energetic and blue being most energetic. The ULX is indicated by the cross-hairs. At the top...

Black holes have properties that resemble dynamics of both solids and liquids

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In theoretical physics you can have different planes that behave like black holes and they are called black branes. When black branes are folded into multiple dimensions they form a 'blackfold', which new research shows has a relationship between gravity and fluid mechanics and solid-state physics. (Credit: Credit: Artist impression by Merete Rasmussen)

Dec. 11, 2012 — Black holes are surrounded by many mysteries, but now researchers from the Niels Bohr Institute...

X-ray vision can reveal moment of birth of violent supernovae

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GRB 080913, a distant supernova detected by Swift. This image merges the view through Swift's UltraViolet and Optical Telescope, which shows bright stars, and its X-ray Telescope. (Credit: NASA/Swift/Stefan Immler)

Dec. 7, 2012 — A team of astronomers led by the University of Leicester has uncovered new evidence that suggests that X-ray detectors in space could be the first to witness new supernovae that signal the death of massive stars.

Astronomers have...