Centaurus ?????????????????

1
Centaurus ?????????????????
2006/11/06 ???_at_??? ????
???
Abell 2199 ????? (5 kpc x 5 kpc)
?100 ?1000 ??????
?? ???
??????? X?
?????? X???????
???
X-ray
??????????
??????????(??/???)?????????
?????? ICM ??????????
???? ICM ?????
ICM ? bulk motion
? simulation ICM ? bulk flow 1000 km/s
(several Gyr)
2
?? ICM ?? bulk motion ?????????
P
??
??????? ? ????????????
ICM
P?P
thermal velocity bulk velocity
???????????????????????????
X?????????????????????????
(2-3)MX Mlense
bulk motion ????????? dynamics ?????????
3
????????????
A2199
???????????????
6.7 keV ? Fe-K (He like)
Centaurus
??????????????? OK
Fe-L
(CCD ?????????????)
Fe-K
Suzaku XIS
(4 CCD chip XIS0,1,2,3)
55Fe ????????????????????
background ????Fe-K line ????????
? 3???????? XIS0,2,3 ??????
2 ?????? ? ?10 kpc ???????
55Fe cal source
Suzaku XIS ??ICM ? bulk motion ?????????
4
Centaurus ???
A2199
Suzaku 2005/12/27-29 ?3????
(????????? 8 )
Centaurus
Fe-L
??(z0.0104)?????? Fe ????
Fe-K
???????????????? bulk motion ??????
???????????? (hot spot)
offset2
? merger ????
center
Chandra (ASCA) ??????? bulk motion ????????
offset1
5
Chandra ??? bulk motion ??? (Dupke Bregman 2006)
??
R3
R-2
PEAK
PEAK-
8 arcmin
???????????????Fe line ????????????
(2.3 1.1)103 km/s _at_ R-2 ? R3
bulk velocity gradient
(2.9 0.7)103 km/s _at_ PEAK- ? PEAK
CCD chip ?????????????????????????????
??????? cross confirmation ???
6
XIS ??????????
centeroffset2
1000 km/s ? bulk motion ???????? 22 eV
??????????????????
(a) peak energy
??????? 55Fe (Mn Ka 5.895 keV)
centeroffset1
????3???XIS0,2,3 ?? lt 0.1 ???
(b) ??????? peak energy ??????
3??? overlap ??????? lt 0.1
(c) ?????????
????????????????????????
Centaurus ????? XIS0,2,3 ???????? lt 0.2
XIS ????????????????0.13 (1 sigma)
? 10eV, 470 km/s
7
Fe-K ?????
2.12.1 (2828 kpc) ? 52 ??????? ???????????????
?
model ????? 3 ?? gaussian
? He like Fe Ka (6.70 keV)
? H like Fe Ka (6.97 keV)
? He like Ni Ka (7.80 keV) He like Fe Kß
(7.90 keV)
?
asymmetric shape (26 lines) ? gaussian ?????
?
?
simulation E0 6.677 keV, s0 27.8
eV Eres70 eV
8
???????????? peak energy, Eobs ?????
bulk line shift z (E0-Eobs)/Eobs
?????????????
52 ????? consistent ? line shift
ltEobsgt 6.6133 0.0162 keV
zcluster 0.0104 0.002
ltzobsgt 0.0097 0.0024
consistent
???????? bulk motion ?????????
9
large scale bulk motion
3?????????zobs ? bulk velocity ???????
?
?
?
????????? ? 10 ?????? bulk motion ???
2
2
bulk motion ???? ?v lt v(sstat ssys) 1400
km/s
10
Discussion
(a) Chandra ?????? bulk motion
PSF ?????
Chandra ? 90 lower limit ????????? simulate
PEAK-, ?v 1700 km/s, R-2,3 ?v 760
km/s
XIS
690 km/s
300 km/s
(6909601650)
(30010201320)
Chandra ???? XIS ???????????? consistent ????
Chandra ????????????????
11
(b) ??? ?v lt 1400 km/s
ICM thermal velocity sound velocity 880 km/s
(3 keV)
? (??)1/2
thermal velocity bulk velocity
??????????????
bulk gas ? sr ?v / 2 ?????????????
(??)
(ICM??)
(bulk ??)
f bulk fraction (0 f 1)
2
ßr ?gas sr / kT
bulk ???? sr ? r
(kinetic energy ratio)
ICM ?? ?gas ? r -1
sr lt ?v / 2 700 km/s ? (1fßr) 2
sr lt ?v / 2 sin? 1100 km/s ? (1fßr) 3.6
??????????????????? 23.6 ??????
12
???
Suzaku XIS ?????Centaurus ??????? bulk velocity
? ?????????10??????? bulk ???????????
Chandra ????? consistent ??????
bulk motion ???????????????????23.6 ????
????????????
??????Perseus ??? (????????????) ???? bulk
motion ????????????