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Giant Black Hole's Massive Jets Get Extreme Close-Up in New Photo

Tuesday, May 24, 2011 17:49

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Merging X-ray data (blue) from NASA’s Chandra X-ray Observatory with microwave (orange) and visible images reveals the jets and radio-emitting lobes emanating from Centaurus A’s central black hole.
CREDIT: SO/WFI (visible); MPIfR/ESO/APEX/A.Weiss et al. (microwave); NASA/CXC/CfA/R.Kraft et al. (X-ray)

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Energetic jets spewed forth from a galaxy’s supermassive black hole got a close-up in their most detailed image ever taken by Earth radio telescopes.

The picture shows jets racing away at one-third the speed of light from a huge black hole weighing 55 million times the sun’s mass. Most matter falling toward a black hole becomes trapped, but some matter at the base of the jets gets ejected outward at about one-third the speed of light. In this case, the black hole sits at the center of the Centaurus A galaxy. [Video: Best Ever View of Black Hole's Jets]

“These jets arise as infalling matter approaches the black hole, but we don’t yet know the details of how they form and maintain themselves,” said Cornelia Mueller, the study’s lead author and a doctoral student at the University of Erlangen-Nuremberg in Germany.

The matter in the jets has created a pair of giant radio-emitting lobes that each stretch almost a million light-years long. That makes the Centaurus A galaxy appear almost 20 times the size of a full moon when seen in radio waves, despite being 12 million light-years away from Earth. [Photo of the Black Hole Jets of Centaurus A]

Left: The giant elliptical galaxy NGC 5128 is the radio source known as Centaurus A. Vast radio-emitting lobes extend nearly a million light-years from the galaxy. Right: The radio image from the TANAMI project provides the sharpest-ever view of a supermassive black hole’s jets.
CREDIT: (Left) Capella Observatory (optical), with radio data from Ilana Feain, Tim Cornwell, and Ron Ekers (CSIRO/ATNF); (Right) NASA/TANAMI/Müller et al.

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Astronomers combined the power of nine radio telescopes scattered across Earth’s southern hemisphere to take the most detailed image yet of the jets. The team works under the TANAMI (Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry) project.

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