CHANDRA DETECTS SOUND WAVES FROM BLACK HOLE

Chandra detects sound waves from Black Hole

AP
The Times of India
Wednesday, September 10, 2003 
 
Washington - The voice of a black hole is a deep, deep
bass, 57 octaves below middle C and far beyond the
hearing range of humans. The Chandra X-ray Observatory
has picked up sound waves for the first time from a
cluster of galaxies 250 million light years away. 

Astronomers at the Institute of Astronomy in Cambridge,
England, discovered the sound waves while analysing the
Chandra images of the Perseus cluster, an immense
grouping of galaxies held in formation by the powerful
tug of a supermassive black hole. 

Andy Fabian, a professor at the Institute of Astronomy,
said a close study of the fine detail collected by
Chandra shows ripples in the X-ray pattern that are
caused by sound waves excited by the energy from the
black hole. 

He said that the sound produced by the black hole was a B
flat, the same pitch as a key near middle C on the piano.
But the song of the Perseus Black Hole is 57 octaves
below that middle C. 

This was a tone frequency more than a million, billion
times deeper than the limits of the human ear, said
Fabian.

The voice of the black hole was detected by analysing the
pattern of X-rays coming from superheated gases in the
Perseus galactic cluster, said Fabian.

Squeezed by the gravitational pull of the black hole and
the galaxies in the cluster, gases are heated to 50
million degrees, hot enough to generate X-rays.
 
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