Penemuan galaksi paling redup hingga saat ini oleh SDSS
Oleh : Suharyo S.
Kamis, 3 Juni 2004 (18:49 WIB) dari IP 202.159.34.187

SDSS mengumumkan penemuan galaksi paling redup hingga saat ini,
Andromeda IX, sebuah galaksi satelit dari galaksi M31 (Andromeda - yang
juga merupakan galaksi spiral besar yang terdekat dengan Bima Sakti).

http://www.sdss.org/news/releases/20040531.andromeda9.html
(untuk artikel sepenuhnya)

http://www.sdss.org (untuk halaman depan SDSS)

saya belum cek ada atau tidak preprint di astro-ph tentang ini.

Penemuan ini memberi informasi penting sebagaimana saya kutip di bawah
ini dari artikel utamanya:

But the discovery of Andromeda IX is not just interesting for setting a
record. It may also point the way to solving a major mystery in modern
astronomy -- the "missing satellites" problem.

The leading theoretical models for how large structures -- galaxies and
clusters of galaxies -- formed in the Universe employ a concept called
dark matter. Dark matter can only be detected via its gravitational
pull, neither emitting nor reflecting light (hence the "dark" in its
name).

The models hold that this dark matter began clumping together soon after
the Big Bang, while the normal matter was still too hot to come
together. Smaller clumps of dark matter merged to form larger and
larger clumps, and when the normal visible matter had cooled
sufficiently to "feel" the gravitational pull of the dark matter, it
collapsed onto these dark matter clumps. In this way, the dark matter
clumps acted as seeds for galaxy formation.

The problem is that the models also predict large galaxies should have
something like 100 times more small galaxy companions, each associated
with a clump of dark matter, than have been seen to date. The discovery
of Andromeda IX raises the possibility these galaxies could simply be
too faint and diffuse to have been detected in previous surveys.

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