RaLosa et al (2000) VLA

1
????????????????????????

• ????(????)?????(?????)?
• ?????(?????)??? ?(?????)?????(?????)

2
???????????????
RaLosa et al (2000) VLA
Yusef-Zadeh and Morris 1987
3
?????????????
NANTEN???????????????CO???????? (Fukui et al.
2006)
4
???????????
arc
????
Loop
1kpc
5
????????3??MHD????????
Initial Condition ß1
Machida et al. 2000
6
?????????????????
??
Isosurface of veritical velocity
????????????????????????
??? ? TrfdO/dr ? aB2dO/dr
??
7
Application to SgrA(Machida et al. 2007 in prep)
43GHz
690GHz
t1 surface (3Dview)
1AU
8
????

• ??????????3??MHD????????
• ??????????3??MHD????????
• ????????????? ??????????

9
???????MHD????????
Nishikori, H., Machida, M., and Matsumoto, R.,
ApJ 641, 862 (2006)
10
?????????????????
Our Galaxy (Han et al., 2002)
M51 (Neininger Horellou, 1996)
11
????????(MRI)
Angular momentum
MRI in differentially rotating disks (Balbus and
Hawley 1991)
12
????????MRI???????????(Dziourkevitch et al. 2004)
???? 1kpc lt r lt 5kpc -1kpclt z lt 1kpc
???????????????????
13
???????????????
????????????????????
Parker (1966), Matsumoto et al. (1988)
14
?????????????????? (Matsumoto et al. 1988)
3/2
2
2
g(z) -GMz/(r0 z )
ßPgas/Pmag1
????????? ???????????
15
??????????????????(Nishikori et al. 2006)

• ????????
• ??????????????????( Miyamoto 1980)
• ????
• 10kpc???????????????????
• ?????????? (ß100,1000,10000)
• T105K
• r0.8kpc ?????
• ?????????

25064319 mesh
16
??????????
t 3.8Gyr
17
????????????????????
2µG
after 1Gyr
5Gyr
??????????????? (5kpc lt r lt 6kpc)
1Gyr????????????????????
ß01000
18
????????????
19
?????????????
???????50km/s??????
NANTEN???????????????CO???????? (Fukui et al.
2006)
????????????????????????
20
Loop????????
velosity
position
velosity
position
velosity
Color12CO Contour13CO(white)
position
B100µG ??100pc3 Emag
1052erg
???? n 150 cm-3 ??????? VA 24 km s-1
21
2D MHD simulations of Parker instability
Fukui et al. (2006)
22
???3??MHD????????
Machida et al. 2007
23
Formation of magnetic loops
Magnetic loop structure plasma ß1 Hight
400pc Length 1kpc Inclination angle 40?
Magnetic loops are created where the gas density
becomes lower than the region outside the loop.
Yellow Isosurface of ß1 Blue Magnetic field
strength
24
???????????? ??????????????????????
25
????????????????
H100pc T010000K ß0 1 n0 5/cm3 162246
mesh ??????????? CANS
500pc
?????
26
??????????
??
Inoue, Inutsuka, Koyama 2006
????
27
??????????????????????
T04000K
n02/cm3

• 2??????
• ?????? ????????????
• ?????????????????????

28
?????????
T04000K
n02cm-3

• 10000K??????100K?????????
• ??????????????????

29
????????? (T08000K)
??
??
30
???????????(1)

• ??????????????????

?????
10000K
100K
Isobe et al. 2005
3????
?????????????
?????????? top heavy ????
31
???????????(2)

• ?????????????????

Slow shock
Shibata and Matsumoto 1991
32
?????????

• ??????????3??MHD??????????????????????????????????
  ???
• ???????????????????????????????????????????
• ??????????MHD??????????????pc?????????????????????
  ???
• ?????????????????????????????????????????????????
• ???????????????????????????????????
• ??????????????????????3??MHD?????????????????????
  ?????????????????????????????????

33
END