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> ASCA
> Scientific Results
> Black Hole Signature
ASCA discovered the signature of a black hole at the center of our our Galaxy. The signature characteristic of a black hole is an X-ray emission line of iron. This line indicates that low-temperature matter is exposed to strong X-ray radiation.
This points to the possibility that several hundred years ago there was strong X-ray activity at the center of our galaxy. Maybe a giant black hole exists there.
Map of the diffuse X-ray emission from the galactic center obtained by ASCA. The color image of X-ray emission is superimposed on the 20cm radio continuum contours obtained by Yusef-Zadeh in 1984.
From spectroscopic analysis, this emission is shown to originate
from thin, hot plasma of a temperature about 10keV. The X-ray
emission is the brightest at the galactic center in the region
of the Sagittarius A radio shell and extends along the radio
arc.
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