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Molecular Loops in the Galactic Center

Molecular Loops in the Galactic Center. Yasuo Fukui Nagoya University. Molecular loops as evidence for magnetic floatation driven by Parker Instability. Magnetic loop in solar corona (TRACE ： 191 Å ). Loop 1. 300 pc. 220 pc. MHD activities of galactic disks. Loop 2. 300 pc. 600 pc.

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Molecular Loops in the Galactic Center

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  1. Molecular Loops in the Galactic Center Yasuo Fukui Nagoya University

  2. Molecular loops as evidence for magnetic floatation driven by Parker Instability Magnetic loop in solar corona (TRACE：191Å) Loop 1 300 pc 220 pc MHD activities of galactic disks Loop 2 300 pc 600 pc Fukui et al. (2006)

  3. -150 km/s -70 km/s -110 km/s -50 km/s Velocity distributions of the loops Loop ２ Loop 1 Torii et al. (2009a), submitted

  4. Position-Velocity diagram (range b = 0.5 – 2.5°) Color:12CO Contour:13CO(white) Fukui et al. (2006)

  5. Magnetic loops in the GC Machida et al. (2009) NANTEN CO(J=1-0)　20-200 km/s ・　MHD numerical calculation found a number of loops in the Galactic center ・ Fujishita et al. (2009) discovered loop 3.

  6. CO vs HI color：HI（Parkes）, contours：CO（NANTEN） 3kpc - arm H2 mass: loop 1 = 2×105 Msun, loop 2 = 3×105 Msun HI mass：loop 1 = 2×105 Msun, loop 2 = 3×105 Msun 　→ Total Ek ~ 1052 erg

  7. Helix like distributions in the loops Color: CO(2-1) NANTEN2Contour : CO(1-0) NANTEN

  8. Formation of the helix components Helix on the Sun Shibata & Matsumoto 1991 • A helical magnetic field could be formed by… • Shear motion by differential rotation. • Coriolis force for floating loops. (Shibata & Matsumoto 1991) • ・ Kink instability amplifies the degree of distortion

  9. Foot point in 12CO(J=3-2) ASTE CO(J=3-2) -180 - -40 km/s NANTEN CO(J=1-0)

  10. 12CO(J=3-2)　VB diagram • U shape • Broad emissions • Protrusion

  11. U shape, broad emissions and protrusion

  12. 12CO(J=3-2)/12CO(J=1-0) ratio：　R3-2/1-0 Color：R3-2/1-0, Contours：ASTE CO(J=3-2)　

  13. LVG result R3-2/1-0　VB diagram Tk ~ 90 K

  14. U shape Isobe et al. 2007 Isobe et al. (2007) • Down flow from two loops forms U shape in both space and velocity. • Magnetic reconnection may occur at the foot point.

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