《自然》[Nature]13年1月3日出版pdf全文

nero1981

[hide][/hide]
0 r- }5 n" C& D& j/ v
: S9 O' s- I! z5 e$ N1 r, m* xGiant spiral galaxies are assembled from smaller 7 l3 _# ]$ z: l
systems through a process known as hierarchical clustering. In orbit around 5 E: |% K0 C/ h4 O0 k. l' R
these giants are dwarf galaxies, which are presumably remnants of the galactic
( G, W9 K3 x3 J+ j# H* s0 Lprogenitors. Recent studies of the dwarf galaxies of the Milky Way have lead
9 f. t( |0 ~' O- i  G# S7 @3 j. m, C0 Isome astronomers to suspect that their orbits are not randomly distributed. This
. ~: }4 r, n  o) ^2 Y% zsuspicion, which challenges current theories of galaxy formation, is now - ^7 y1 I( p% Q
bolstered by the discovery of a plane of dwarf galaxies corotating as a coherent ! h% j+ S; \" |/ e
pancake-like structure around the Andromeda galaxy, the Milky Way’s close : c) V1 n$ f  I8 o: q
neighbour and in many respects its ‘twin’. The structure is extremely thin yet & ^% C4 Q. k6 _9 c- g6 G8 U) @6 e
contains about half of the dwarf galaxies in the Andromeda system. The authors 6 a; [- ?* m6 e
report that 13 of the 15 satellites in the plane share the same sense of
' Z! ~! G' D/ Q+ R. `: O: g* |8 _rotation. On the cover, a true colour image of the Andromeda galaxy, with two ( e. G6 S5 J; t; e; t* l$ n; s
satellite galaxies visible, by Jean-Charles Cuillandre (CFHT) and Giovanni 3 J3 P, i/ q/ [
Anselmi (Coelum Astronomia).
9 x7 j" ]1 w! ~7 j2 n2 U* r6 o# f8 L% p7 l% I; C3 U* n
- Z9 t; o. Y1 h

tpwang

回复 nero1981 的帖子9 T+ K3 P  o2 z. {6 b; u& u3 C/ r
& U8 ^" n- d8 m6 l
thanks

exin11

eley

顶~~~

懵懂干细胞

谢谢分享

wangzhiqi86

谢谢分享

woosheng

thanks

ljs

下载

cuitengfa

1024

jayhaoli01

thanks a lot！