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Zooming in on a great void.


Using an orbiting satellite tuned to listen in on the X-ray screams from black holes 1. black hole - An expression which depends on its own value or a technique to detect such expressions. In graph reduction, when the reduction of an expression is begun, the root of the expression can be overwritten with a black hole. If the expression depends on its own value, e.g.

x = x + 1

then it will try to evaluate the black hole which will usually print an error message and abort the program.
, astronomers have obtained the most detailed view yet of the environment surrounding these cosmic abysses.

With the help of the XMM XMM - Extended Memory Manager
XMM - High Throughput X-Ray Spectroscopy Mission
XMM - X-Ray Multi-Mirror observatory (European Space Telescope)
XMM - XRay Multimirror (telescope)
-Newton satellite, Jane Turner of NASA's Goddard Space Flight Center in Greenbelt, Md., and her team tracked the motion of hot spots in the gas disk swirling around a black hole that sits at the center of the galaxy Markarian 766.

By charting periodic changes in the energy of X rays streaming from the gas disk, Turner's team discerned three hot spots in it. All are within a distance from the black hole roughly 5 times the space between Earth and the sun.

"Each of the hot spots is about the size of our sun, and they're orbiting [the black hole] at an incredible 33,000 kilometers per second," said Turner.

This is the first time that astronomers had detailed the motion of material so close to a black hole. Researchers had observed the motion of individual stars near the black hole at the center of our own galaxy, but these orbit hundreds of times farther out than the hot spots observed around Markarian 766's black hole do.

Probing material this close to a black hole will help astronomers study the effects of general relativity in these extreme gravitational environments, Turner says.--D.S.
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Title Annotation:Black Holes
Publication:Science News
Article Type:Brief Article
Geographic Code:1U5MD
Date:Jan 22, 2005
Words:229
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