Chandra - A New Way to Weigh Giant Black Holes

How do you weigh the biggest black holes in the universe? One answer can be found from a new technique that astronomers have developed using data from NASA's Chandra X-ray Observatory. By measuring a peak temperature in the hot gas in the center of the giant elliptical galaxy NGC 4649, scientists have determined the mass of the galaxy's supermassive black hole -- providing consistent results with a traditional technique.

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