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Astronomy Picture of the Day
Galactic Magnetar Throws Giant Flare
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#67668
by
[z]Barbara Harris
@
22.02.2005 00:00
- nach oben -
Galactic Magnetar Throws Giant Flare
Explanation:
Was the brightest Galactic blast yet recorded a
key to connecting two types of celestial explosions?
Last December, a dense sheet of
gamma rays
only a few times wider than the Earth
plowed through
our Solar System, saturating
satellites and noticeably
reflecting off the Moon
.
A
magnetar
near our
Galactic Center
, the source of
Soft Gamma Repeater
(SGR) 1806-20,
had unleashed its
largest flare
on record.
The brightness and briefness of the tremendous explosion's
initial peak made it look
quite similar
to another type of tremendous explosion if viewed from further
away -- a short duration gamma-ray burst (GRB).
Short duration GRBs
are thought by many to be
fundamentally different than their
long duration GRB
cousins that are likely
related
to distant
supernovas
.
Illustrated above is a series of drawings depicting
an outgoing explosion during the initial SGR spike.
A fast moving wave of radiation is pictured
shooting away from a central
magnetar
.
The possible link between SGRs and GRBs should become
better understood as more and similar events are
detected by the Earth-orbiting
Swift satellite
.
Credit & Copyright