glast and nanten molecular clouds as a probe of high energy phenomena yasuo fukui nagoya university...
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![Page 1: GLAST and NANTEN Molecular clouds as a probe of high energy phenomena Yasuo Fukui Nagoya University May 22, 2007 UCLA](https://reader030.vdocuments.net/reader030/viewer/2022020417/56649d545503460f94a30f29/html5/thumbnails/1.jpg)
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GLAST and NANTENMolecular clouds as a probe of high energy phenomena
Yasuo Fukui
Nagoya University May 22, 2007 UCLA
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NANTEN & NANTEN2
@Atacama, alt.4800m@Las Campanas, alt.2400m
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Galactic Plane Survey•12CO(J=1-0), Grid size ~ 4 (|b|<5), 8 (5<|b|<10)•Integ. time (typ) ~5sec/point, 1,100,000 observed points
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POINTS
• Cosmic ray protons: identify the sites of acceleration by establishing the hadoronic origin of gamma rays
• X factor = H2/W(CO) is determined
• GLAST offers a useful tool with NANTEN CO dataset
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Molecular clouds toward GC TeV ridge - NANTEN 13CO(J=1-0), velocity channel maps (increment: 10km/s)
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Galactic Center Molecular Loop2Fukui,Y. et al. Science, 314, 106, 2006
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12CO(J=1-0) and X-ray in G347.3-0.5
Fukui et al. 2003
molecular hole surrounding boundary of the SNR
CO peaks⇔X-ray peaks show good spatial correlation(northwestern bright rim)
↓indicates interaction of the SNR with molecular clouds.
-11 km/s < VLSR < -3 km/s
D
A
B
C
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G347.3-0.5 Velocity distribution
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VLSR and kinematic distance
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Parameters d = 1 kpc d = 6 kpc
Radius (pc) 8.7 52
Age (yr) 1600 >10000
Evolutionary phase Free-exp SedovAmbient density
(cm-3)< 0.01 0.003
Shock velocity (km/s)
5500 3200
Etotal of accelerated particles *(erg)
~ 1048 ~ 1050
* (Eacc/1048)(Mcloud/200)(l/3)-3(d/1)-5 = 1.35 (Enomoto et al.2002)
Physical parameters of G347.3-0.5
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XMM and NANTEN
Moriguchi et al. 2005
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ASTE CO J=3-2
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TeV-gamma & molecular clouds
H.E.S.S. image (Aharonian et al. 2004)
17 pc
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SNR G347.3-0.5 (RSJ1713.7-3946)
-Shell-like structure: similar with X-rays- No significant variation of spectrum index across the regions-spatial correlation with surrounding molecular gas Aharonian et al. 2005
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SNR G266.2-1.2 (RX J0852-4622, Vela Jr.)
Molecularobservations(Moriguchi et al. 2001)
Age: 680 - several x 1000 yr ?Distance: 200 - 1000 kpc ?
44Ti line Detectionby COMPTEL (Iyudin et al. 1998)
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Concentration of Masersnerby SNR
Association with UCHII:W28A2
Hotspots around SNR
2-3 % Crab@E>0.35TeV
Size ~ 0.1-0.2 deg
Spectra: dN/DE ~ E-0.26
H.E.S.S. detection toward W28
[Preliminary]
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HESS 1813-178
Molecular clouds associated with counterparts of TeV sources
- HII region W33, SNR 12.82-0.02 (AXJ1813-178)- distance ~ 4 kpc -> consistent with kinematic dist
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HLC Survey toward far-infrared excess clouds
32 HLCs are newly detected
Onishi et al. 2005
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Per shell of HLC
Yamamoto,et al.
ApJ, in press, 2006
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ASTE CO J=3-2
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12CO(J=3-2) wing-like profiles
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12CO(J=1-0) wing-like profiles
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LVG analysisLarge Velocity Gradient model (e.g. Goldreich & Kwan 1974, Kim et al. 2002)
One-dimensional uniformvelocity gradient.
gradV = 5 km/sX(CO) = 10-4.5
R(3-2)/(1-0) ~ 0.7-0.8↓
n(H2) ~ 103-4 cm-3
Tkin ~ 30 - 50 K
For typical dark cloudsn(H2) ~ 103-4 cm-3, Tkin ~ 10 - 20 K
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POINTS
• Cosmic ray protons: identify the sites of acceleration by establishing the hadoronic origin of gamma rays
• X factor = H2/W(CO) is determined
• GLAST offers a useful tool with NANTEN CO dataset
![Page 29: GLAST and NANTEN Molecular clouds as a probe of high energy phenomena Yasuo Fukui Nagoya University May 22, 2007 UCLA](https://reader030.vdocuments.net/reader030/viewer/2022020417/56649d545503460f94a30f29/html5/thumbnails/29.jpg)