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Black Hole Kills Star, Blasts Beam at Earth

By R&D Editors | July 15, 2011

Black Hole Kills Star, Blasts Beam at Earth

Black Hole Kills Star, Blasts Beam at Earth

Observations led by astronomers at the University of Warwick have shown that the flash from one of the biggest and brightest bangs yet recorded by astronomers comes from a massive black hole at the center of a distant galaxy. The black hole appears to have ripped apart a star that wandered too close, creating a powerful beam of energy that crossed the 3.8 billion light years to Earth.

Their research was published June 16, 2011, in the journal Science, in a paper entitled “An Extremely Luminous Panchromatic Outburst from the Nucleus of a Distant Galaxy”.

The high energy X-rays and gamma-rays persisted at an extremely bright level for weeks after the event, with bright flares arising when further chunks of the star apparently fell into the black hole, while at optical and infrared wavelengths it is as bright as a hundred billion suns. The extreme brightness of this event comes from the fact that it created a powerful beam of energy pointing a jet of light toward the Milky Way and, thus, concentrated into only a small fraction of the sky and that was detected at Earth 3.8 billion years after the star was ripped apart.

Andrew Levan of the University of Warwick, lead researcher of the international team observing this event said “Despite the power of this the cataclysmic event, we still only happen to see this event because our solar system happened to be looking right down the barrel of this jet of energy.”

The new research paper clearly establishes that the source of this event (known now as Swift 1644+57) is right at the heart of the far away galaxy, 3.8 billion light years away, at a spot that would be in the constellation Draco. This conclusion comes from a combination of the most powerful telescopes on the ground, and in space, working in tandem to pinpoint this unique and unprecedented event. These include the Hubble Space Telescope, Chandra X-ray Observatory, Swift satellite, and the Gemini and Keck Telescopes in Hawaii.

University of Warwick researcher Andrew Levan added: “The best explanation that so far fits the size, intensity, time scale and level of fluctuation of the observed event, is that a massive black hole at the very centre of that galaxy has pulled in a star and ripped it apart by tidal disruption. The spinning black hole then created the two jets, one of which pointed straight to earth.”

Professor Nial Tanvir, second author of the paper, based at the University of Leicester added “It is rare for stars to get very close to the black holes in the center of galaxies but, when they do, they will always come off second best.”

 

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