Wobbling disc strengthens case for black hole

Croswell, Ken
September 1991
New Scientist;9/21/91, Vol. 131 Issue 1787, p24
The article reports that astronomers have detected for the first time the wobbling, or precession, of a disc of in falling matter round a black hole. The evidence comes from the way in which the black hole, called LMC X-3, varies its output of X-rays. LMC X-3 is in the Large Magellanic Cloud, the closest galaxy to the Milky Way. It is one of only three objects that astronomers firmly believe to harbor a black hole. The other good candidate black holes-Cygnus X- I in the constellation Cygnus and A0620-00 in the constellation Monoceros-are both in the Galaxy. Each of these black holes lies near a normal star and tears material from it. The material then orbits the black hole in an accretion disc before plunging into the black hole.


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