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Sagittarius A |
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Sagittarius AStrongest source of cosmic radio waves, lying in the direction of the constellation Sagittarius. Discovered by Karl Jansky in 1932, it has been identified as the nucleus of the Milky Way Galaxy. The region is relatively small and constitutes an intense source of infrared radiation thought to be emitted partly by stars and partly by dust around them. Within the region is a much smaller radio source, Sagittarius (Sgr) A*, which appears to mark the centre of the Galaxy. Observations indicate that the galactic nucleus contains a black hole with a mass 3,600,000 times that of the Sun; they also provide a strong case that Sgr A* is the black hole. The activity at the Galaxy's centre resembles that of an active galactic nucleus but on a much smaller scale. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Muno of the University of California, Los Angeles (UCLA) and his colleagues found four dramatically flickering X-ray sources within 3 light-years of the Milky Way's supermassive black hole, known as Sagittarius A. Researchers already know the Milky Way's core contains a powerful radio source called Sagittarius A *, an indicator that our galaxy's center may harbor a black hole 2 million times as massive as the sun. |
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Sagittarius A
