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Astronomy Picture of the Day
GRO J1655-40: Evidence for a Spinning Black Hole
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#87458
by
[z]Barbara Harris
@
29.05.2006 00:00
- nach oben -
GRO J1655-40: Evidence for a Spinning Black Hole
Explanation: In the center of a swirling whirlpool of hot gas is likely a beast that has never been seen directly: a
black hole
. Studies of the bright light emitted by the
swirling gas
frequently indicate not only that a
black hole
is present, but also likely attributes. The gas surrounding GRO J1655-40, for example, has
been found to display an unusual flickering
at a rate of 450 times a second. Given a
previous mass estimate
for the
central object
of seven times the mass of our
Sun
, the rate of the
fast flickering
can be
explained
by a
black hole
that is
rotating
very rapidly. What physical mechanisms actually cause the
flickering
-- and a slower
quasi-periodic oscillation
(QPO) -- in
accretion disks
surrounding
black holes
and
neutron stars
remains a topic of much research.
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