《自然》[Nature]13年1月3日出版pdf全文

nero1981

[hide][/hide]* Y* D) X4 a$ N: R

# S; ]" r! T/ S9 N6 f# {1 R/ rGiant spiral galaxies are assembled from smaller " U7 ]. N- ]2 N& z$ ~( ]/ d$ o
systems through a process known as hierarchical clustering. In orbit around
, o& Y# T) b  o; mthese giants are dwarf galaxies, which are presumably remnants of the galactic
# s* ?1 W1 O+ {2 ?progenitors. Recent studies of the dwarf galaxies of the Milky Way have lead
5 z4 d: y- t: P/ msome astronomers to suspect that their orbits are not randomly distributed. This 2 j, j' I; c& t1 f' x$ V6 o
suspicion, which challenges current theories of galaxy formation, is now . o- j2 B6 d% d( W* M8 a- I, R
bolstered by the discovery of a plane of dwarf galaxies corotating as a coherent
$ m9 _2 c1 c: A0 kpancake-like structure around the Andromeda galaxy, the Milky Way’s close 3 M1 J0 A) P3 n; G$ @) P7 R7 s
neighbour and in many respects its ‘twin’. The structure is extremely thin yet
% l4 l6 {5 t& d9 T1 P+ \contains about half of the dwarf galaxies in the Andromeda system. The authors : D* N, l9 ]& g. w: b- W  U
report that 13 of the 15 satellites in the plane share the same sense of
$ f* l$ @; N" A0 r% frotation. On the cover, a true colour image of the Andromeda galaxy, with two
& O1 p( }8 \0 j  f. S* zsatellite galaxies visible, by Jean-Charles Cuillandre (CFHT) and Giovanni
+ f3 x( O. o2 H5 g2 Y1 CAnselmi (Coelum Astronomia).9 i+ A$ _* ^# k6 V  _2 G2 p

3 f# S$ m- F+ C# K% [( n& C( p
1 K. M5 U' e, p) v6 ]

tpwang

回复 nero1981 的帖子; B4 u5 L8 ~# Q

& c/ o- S$ w4 y8 r% `3 othanks

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！