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View Full Version : Spitzer Sees Hidden Black Holes



Fraser
2005-Sep-07, 01:25 AM
SUMMARY: NASA's Spitzer Space Telescope has peered through walls of galactic dust to spot supermassive black holes called quasars. Some quasars are visible to telescopes, but others are behind so much gas and dust they can only be seen in the infrared spectrum, which is good for viewing through dust. Based on background X-ray radiation, astronomers had an estimate for how many quasars are out there, but they could never see them with telescopes. Now Spitzer has shown that those quasars are there, just hidden.

View full article (http://www.universetoday.com/am/publish/spitzer_finds_hungry_black_holes.html)
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