The Suzaku Results of the Galactic Center X-rays
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Transcript of The Suzaku Results of the Galactic Center X-rays
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The Suzaku Results of the Galactic Center X-rays - Collisinal Excitation or Charge Exchange ? - Katusji Koyama, Kyoto University
Nickname Suzaku
An AncientOriental mythology
ASTROE2 Launch:
2005/7/10
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3 Main Instrumnets on Suzaku : HXD, XRS, XIS
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Resonance (r)6.703keV
1s2p1P1
Forbidden(f)6.639keVΔl=0,Δs=1
Fine Structure of Fe24+
1s2 1S0
1s2p3P0,1,2
Δl=1,Δs=0 1s2s 3S1Name Transition Energy (eV)---------------------------------------------------------Resonance (r) 1s2s 1 S0-1s2p 1P1 6700.5Intercombination line (x) 1s2p1S0-1s2p 3P2 6682.4 (y) 1s2p1S0-1s2p 3P01 6667.6Forbidden line (f) 1s2 1S0-1s2s 3S1 6636.7
-60 mK, 7.0 eV @5.9 keV: World (Universe) Records. But !
The XRS Spectrum on Orbit
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ASCA 320 ksec (Koyama et al. 1996)
Chandra 600ksec (Muno et al.2004)
XMM 50 ksec (Tanaka)
XIS: The Best Performance as an X-ray CCD
Si X
III
Kα
Si X
IV K
α
Si X
III
Kβ
S X
V K
αS
XV
I Kα
S X
V K
β
Suzaku: 180 ksec
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Si12+Kα
Si12+Kβ
6 7 8
Fe24+Kα Fe25+K
α
Fe24+Kβ
FeKαNi26+Kα
FeKβ
Fe25+Kβ
Ni27+Kα
Ni Kα
Ar16+Kβ
Ar16+KαSi13+Kα Ca18+Kα
Ca19+KαAr17+Kα
S14+Kα
S15+Kα
S14+Kβ
Is the 6.7 keV lineCollisional Excitation or Charge Exchange ?
6.4 keV
6.7 keV
2.46 keV
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He-like Fe K = 6679 eV Close to 6685eV( =6eV)Width () = 38 eV (Triplet, not Velocity) Collisional Excitation
Name Observed Lab ⊿ (eV)-----------------------------S Ly 2622.4+3.6-2.7 2621.6 0.8FeLy 6969.5+2.8-2.1 6965.7 3.8Mn K 5899.6+1.7-0.4 5895.1 4.5
Collisional Excitation= 6685 eVElectron Capture = 6666eV
r
rf
f
6685eV
6666eV
FeXXV FeXXIV
i
i
G-ratio = r / (i+f)
Wargelin, Beiersdorfer et al. 2005, ApJ, 634,687
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Ec= 6679 eV +/- 1 eV ( systematic error~ +- 5 eV):The G-ratio decreases as decreasing plasma temperature. It also decreases with temperature due to the contribution of satellite line. Thus we can constrain the plasma temperature kT using the center energy. The results are: kT = 3.2 keV +3 -1 keV ( Vapec) kT = 7.5 keV +∞ -3 keV ( VMEKAL) This is just the XRS science, hence our GC study make more clear strategy for the NeXT, the corner stone project in Japan.
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Ionization Temperature Fe Klike/He-like: kTi=6.5 keV +/- 0.1ke V Fe K H-like/He-like: kTi=5.1 keV + 1.5 -1.0 keV Ni K H-like/He-like : kTi= 9.3 keV +1.6 -2.5 keV Electron Temperature He-like Fe K/K : kTe=6.2 keV +3 -1keV H-like Fe K/K : kTe> 6.5 keV (lower limi t )
All the results are consitent if the Plasma is kTi ~ kTe=6.5 keV.This methodology to determine the electron temperature (kTe) at the Fe energy is possible only with Suzaku. Our new method constrains the Continuum shape, hence can separate the Non-thermal components.
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Temperatures are nearly Constant at l=-0.4 ~ +0.1 deg ,while decrease at the 6.4 keV Cloud
6.7 keV Flux is smooth over the GC Region
GC Background can be reliably estimated
Sgr A East
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Ec=6663 (6661-6664) eV (6685 eV)Width= 47 (44-51) eV
New SNR Sgr A East
2-temperature CEI ModelkTH = 4.9 keVkTL = 1.2 keV
NEI ModelkTH = 13 keVkTL = 1.2 keVnt = 2x1010 sec
May be Multi-temperature
CEI
NEI
NEI
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The West of the Radio Arc
We found not onlyneutral Fe K but also Fe K and Ni K
Fe
Ni
Neutral Fe (Fluorescence) Neutral Ni (Fluorescence)
He/H-like Fe (GC-plasma: BG)
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6.7 keV , 2.46 keV Line Map Discovery of New SNR Candidates Related to the GC plasma ? Cosmic Ray Acceleration ?
6.4 keV Line Map Discovery of New XRNs Past History of the Sgr A* Activity (Echo) ? Related to the HEESS-TeV Emission ?
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6.7 keV
6.4 keV
New Sources in the Sgr B & C Regions
2.46 keV
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6.40keV-MaP
6.70keV-Map
30 pc
Sgr A*
The Galactic Center Observed with Suzaku
2.46keV-Map
108 K Plasma
107 K Plasma ●
Black Hole
Molecular Cloud
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朱雀
飛鳥時代のキトラ古墳の壁画
Suzaku
The wall painting of “Suzaku” in the ancient tomb “Kitora” built in the Asuka Era
明月記
客星出現例
一條院寛弘三年四月二日
葵酉
夜以降騎官中有大客星
Meigetsuki :Records of guest stars
In the 1-st May 1006,a large guest star appeared within the Kikan (Lupus)Constellation
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