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Astronomy Picture of the Day
The Sagittarius Dwarf Tidal Stream
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#74105
by
[z]Barbara Harris
@
30.05.2005 00:00
- nach oben -
The Sagittarius Dwarf Tidal Stream
Explanation: Is our Milky Way Galaxy out to lunch? Recent
wide field images and analyses
now indicate that our
home galaxy
is actually still in the process of devouring one of its closer
satellite neighbors
. This unfortunate
neighbor
, the
Sagittarius Dwarf
galaxy, is now seen to be part of a larger
Sagittarius Tidal Stream
, a loose filament of stars, gas, and possibly dark matter that entangles the
Milky Way
. An artist's depiction of the stream is shown above.
Speculation
also holds that the
Sagittarius Dwarf
was once pulled through the
Milky Way disk
very close to our
Sun's current location
. An important resulting realization is that
galaxies
contain a jumble of clumps and
filaments
of both
dim
and
dark matter
.
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