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The High-density Ionized Gas in The Central Parsec of The Galaxy

The High-density Ionized Gas in The Central Parsec of The Galaxy. Jun-Hui Zhao, Ray Blundell, James M. Moran (Harvard-Smithsonian CfA) Dennis Downes, Karl F. Schuster (IRAM) Dan Marrone (U. of Chicago). Northern Arm. H30 a at 231.901 GHz 11 tracks with SMA C,EX,VEX configuration

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The High-density Ionized Gas in The Central Parsec of The Galaxy

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  1. The High-density Ionized Gas in The Central Parsec of The Galaxy Jun-Hui Zhao, Ray Blundell, James M. Moran (Harvard-Smithsonian CfA) Dennis Downes, Karl F. Schuster (IRAM) Dan Marrone (U. of Chicago) GC Workshop 2009, Shanghai

  2. Northern Arm • H30a at 231.901 GHz • 11 tracks with SMA • C,EX,VEX configuration • dV=15 km/s, rms=7mJy • qFWHM=2” , qP=54” (~2pc) • Miriad for data reduction Western Arc Sgr A* Eastern Arm Bar GC Workshop 2009, Shanghai

  3. The IRAS sources mark probably as the sign posts of the ionized-gas condensation but not necessarily as the Ionizing sources. Primary Beam • Strength: • I> 200 mJy/b • IRS1W,IRS2L • Broadness: • DV>100 km/s • IRS 16,IRS 6 Multiplicity: • IRS 13, IRS 33 GC Workshop 2009, Shanghai

  4. Red: SMA • Green: VLA × • νH30a ̸νH92a=28 • Error bars: 3s • Similar S/N • Similar profile • shape GC Workshop 2009, Shanghai

  5. GC Workshop 2009, Shanghai

  6. Bar Arms GC Workshop 2009, Shanghai

  7. Te (K) Zhao, Morris, Goss, An 2009, ApJ, 699, 186 GC Workshop 2009, Shanghai

  8. 3D Keplerian model Ghez etal 2008 Gillessen etal 2009 • Dynamical mass: • Orbital parameters: Zhao, Morris, Goss, An 2009, ApJ, 699, 186 GC Workshop 2009, Shanghai

  9. 3D Structure SgrA* GC Workshop 2009, Shanghai

  10. Kinematics Observed Peak Radial Velocity Radial Velocity from Keplerian model (Zhao, Morris, Goss & Tao 2009 ApJ) Non-Keplerian: Strong stellar winds from WR stars sweep up the ionized flows IRS 34 IRS 9W GC Workshop 2009, Shanghai

  11. Mass distribution? Keplerian Model Interaction between Ionized streams Stellar winds GC Workshop 2009, Shanghai

  12. Ionization 90 massive stars (Paumard etal 2006) Green: evolved stars White: early type (OB)stars GC Workshop 2009, Shanghai

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