《自然》[Nature]13年1月3日出版pdf全文

nero1981

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+ E5 Y/ W" }8 v- U( i6 n4 jGiant spiral galaxies are assembled from smaller 2 T9 q! A; H0 w6 c. a3 n+ P
systems through a process known as hierarchical clustering. In orbit around 6 w5 }' D0 w' M% `! b- X
these giants are dwarf galaxies, which are presumably remnants of the galactic
" ?/ N& z6 a) T3 `* D& M4 ]progenitors. Recent studies of the dwarf galaxies of the Milky Way have lead - p& N" C7 B: t" u6 `# G
some astronomers to suspect that their orbits are not randomly distributed. This 3 S6 Y. Q9 W1 `6 C* \" C
suspicion, which challenges current theories of galaxy formation, is now
  o# o6 o% _2 `! O/ K1 v" {7 F! zbolstered by the discovery of a plane of dwarf galaxies corotating as a coherent - L* p5 ~$ {- E6 M! `! A( V2 K8 N
pancake-like structure around the Andromeda galaxy, the Milky Way’s close 1 I, @8 E" p. ]4 q6 {
neighbour and in many respects its ‘twin’. The structure is extremely thin yet
! q+ Z: Q$ l" ?2 \+ S! W5 Ucontains about half of the dwarf galaxies in the Andromeda system. The authors . H5 C* x. k$ ^
report that 13 of the 15 satellites in the plane share the same sense of ; Z2 i, j# b# ?9 @. X9 B5 m/ L+ T6 Y
rotation. On the cover, a true colour image of the Andromeda galaxy, with two
# [# Q/ c& G# ]satellite galaxies visible, by Jean-Charles Cuillandre (CFHT) and Giovanni
( K) e! r! z: o( d" pAnselmi (Coelum Astronomia).! n- O0 s& L) i! U' T: u

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tpwang

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