About the 8 keV plasma at the Galactic Center. High Energy Phenomena in the Galactic Center 17 th June 20005. CEA, Saclay Belmont R. Tagger M. UCLA Muno M. Morris M. Cowley S. The Galactic Center:. R ≤ 150-180 pc ( ~ Central Molecular Zone). X-ray and radio observations:
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High Energy Phenomena in the Galactic Center
17th June 20005
R ≤ 150-180 pc
(~ Central Molecular Zone)
Fe trapped in grains in molecular clouds ?
H-like Argon line ?
Galactic planeII. A possible heating mechanism
(Bally et al. 87, Oka et al. 98…)
B => No shear viscosity: bulk/shear ~ 1017 !!
The bulk viscosity acts on compressional motion:
-> wing flux: FA
But incompressible !
Slow MS wing:
-> wing flux: FS
Fast MS perturbation: - 2D toy model
- asymptotic expansion in vc/va
-> dissipated power: QF
The wake of a cloud: (in a low- plasma)
Drell et al. 65, Neubauer 80,
Wright & Schwartz 90, Linker 91…
1% dissipation would be sufficient… (irregularities, curvature…)
In the Central Region (h*d = 200*300 pc2):
Cloud number: ~ 100 hot component luminosity: ~ 5. 1037 erg/s
+ complex clouds structures
+ intermittent accretion
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