1. 天の川銀河の中心の星の運動
海王星くらいの
軌道で(5km/秒）
5000km/秒以上
太陽の400万倍
も重いブラック
ホールがある

2. 銀河中心のＸ線観測　－その意味と課題ー
銀河中心
銀河内円盤
（1）6.7 keV LIne: 超高温プラズマ（約１億度)の発見

3. XIS: The Best X-ray CCD Suzaku: 180 ksec
ASCA 320 ksec (Koyama et al. 1996)
Chandra 600ksec (Muno et al.2004)
XMM ksec (Tanaka)
XIS: The Best X-ray CCD
Si XIII Kα
Si XIV Kα
Si XIII Kβ
S XV Kα
S XVI Kα
S XV Kβ
Suzaku:　180 ksec

4. The Bets-fit column density are; NSi = 4.8x1018 cm-2
Upper:. The best-fit results with
the absorption gas
in solar abundance
Lower: The best-fit results
with the absorption gas
in non-solar abundance
The Bets-fit column density are;
NSi = 4.8x1018 cm-2
NS = 9.6x1017 cm-2
NFe = 8.2x1018 cm-2
Then;
ZSi = 3.3 solar
ZS = 1.4 solar
ZFe = 2.9 solar
For Si, S: NH = 4.1x1022 cm-2,
For Fe "canonical value“:
NH = 6x1022 cm-2

5. 6 7 8 Fe24+ Kα Fe Kα Fe25+ Kα Ni26+ Kα Fe Kβ Fe24+ Kβ
Table of He-like Iron Triplets
Name Transition Energy (eV)
Resonance (r) 　 1s2１S0 - 1s2p 1P
Intercombination line (x) 1s2 1S0 - 1s2p 3P
(y) 1s2 1S0 - 1s2p 3P
Forbidden line (f)　　　 1s2 1S0 - 1s2s 3S

6. Origin of the Iron Lines ?
1s2p1P1
Electron Capture = 6666eV
1s2p3P0,1,2 f
Resonance (r)
6.703keV
1s2p3P r
Forbidden (f)
6.639keV
Δl=1,Δs=0
1s2 1S0
Δl=0,Δs=1 l
Fine Structure of Fe24+
6666eV
6685eV
Collisional Excitation= 6685 eV
FeXXIV
FeXXV r f l

8. Collisional Excitation is more Likely
He-like Fe Ka =6679 eV:
Close to 6685eV(d =6eV)
6.7keV-Map
H-like Ka line is narrow:
Width (s) = 17 eV
(~ those of Cal Line)
Sgr A*
6.4keV-MaP
No intensity enhancement
at the 6.4 keV cloud
(More H2)
30 pc
Collisional Excitation is more Likely

9. 6 7 8 Sgr A East Fe24+ Kα Fe25+ Kα Fe24+ Kβ
Ionization (He-like/H-like Ka) , Electron (Kb/Ka) Temperatures are both ～6 keV (CIE)
Temperatures are nearly Constant at
l=-0.4～+0.1 deg ,while decrease
at the 6.4 keV Cloud
Sgr A East

11. Lyman Series limit

12. Ionization Temperature
He-like Fe Ka/H-like Fe Ka = 5.7~6.6 keV
He-like Fe Ka/He-like Ni Ka = 3.5~10 keV (to be revised)
Electron Temperature
He-like Fe Kb/Ka = 6~10 keV (to be revised)

13. Centroid of He-like Ka moves with Ionization Temperature due to
the satellite lines  From the Observed Centroid, the Ionization
temperature is 2.5～6.5 keV　(including the systematic error ~5 eV),
consistent with He-like Ka/He-like Kb