《自然》[Nature]13年1月3日出版pdf全文

nero1981

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Giant spiral galaxies are assembled from smaller
6 m9 g! s9 O$ y+ h% `, T! A6 @systems through a process known as hierarchical clustering. In orbit around " N4 S. D, T+ d) f" ^% q
these giants are dwarf galaxies, which are presumably remnants of the galactic 9 c6 _; _2 g5 c+ k" f
progenitors. Recent studies of the dwarf galaxies of the Milky Way have lead
* a$ z* X  e  A% ~. Esome astronomers to suspect that their orbits are not randomly distributed. This
) y2 ^' C0 K1 p& u7 ]4 rsuspicion, which challenges current theories of galaxy formation, is now
6 d, _" i) K( x7 M: {bolstered by the discovery of a plane of dwarf galaxies corotating as a coherent
  D$ b. w# f3 a) f2 |pancake-like structure around the Andromeda galaxy, the Milky Way’s close
3 L% h  F! Q4 E  j, Gneighbour and in many respects its ‘twin’. The structure is extremely thin yet - L: i, e2 h' q% _. Q5 Z
contains about half of the dwarf galaxies in the Andromeda system. The authors ; H# r' z9 X' `/ K; t5 K  l
report that 13 of the 15 satellites in the plane share the same sense of
# J- [. U7 H: w7 i- Hrotation. On the cover, a true colour image of the Andromeda galaxy, with two
' B! [6 d+ z3 m5 esatellite galaxies visible, by Jean-Charles Cuillandre (CFHT) and Giovanni
0 J0 \* C2 t6 T5 z/ T/ T1 b: rAnselmi (Coelum Astronomia).
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tpwang

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