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Feedback: in the form of outflow

Feedback: in the form of outflow. AGN driven outflow. M82 Blue : Chandra Red : Spitzer Cyan : Optical. Star formation driven outflow. Two categories of the gas in a SF/SB galaxy wind. Ambient interstellar medium

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Feedback: in the form of outflow

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  1. Feedback:in the form of outflow

  2. AGN driven outflow

  3. M82 Blue: Chandra Red: Spitzer Cyan: Optical

  4. Star formation driven outflow

  5. Two categories of the gas in a SF/SB galaxy wind • Ambient interstellar medium • Energetic fluid created by thermalization of the SB’s stellar eject or AGN • The hydrodynamical interaction between these two generates the multiphase starburst-driven galactic wind.

  6. Observations of multiphase wind (cold, warm, hot gas & dust) • X-ray • Morphology and kinematics of interstellar emission lines (e.g. Ha…) • Outflow kinematics in the interstellar absorption lines (e.g. MgII, NaD)

  7. From X-ray: Hot Gas Escapes from Dwarf Starbursts Vc= 130 km/s Tremonti et al. 2004 Rotation Speed  Martin 1999, Heckman et al 2000, Martin 2004

  8. From optical absorption lines--NaD(5890,5896A) Low- ionization potential 5.1eV (Martin et al. 2005, 2006) V = -435 km/s V = -96 km/s

  9. From optical absorption lines (Rupke et al. 2005a,b,c) isothermal escape speed Murray et al. 2004, Martin 2005 Outflow velocity Circular velocity Star formation rate

  10. Stack spectrum and stellar continuum He I Mg I Na I

  11. Two-component fit of ISM Na D • Line center shift: • outflow velocity Voff • Line strength (EW): • covering factor Cf • Line widthb • Line ratio τ0

  12. Two-component fit of ISM Na D • Line center shift: • outflow velocity Voff • Line strength (EW): • covering factor Cf • Line widthb • Line ratio τ0

  13. Inclination effect face on edge on

  14. Isolate the main driver of the observed correlation: Disk-like components

  15. Isolate the main driver of the observed correlation: outflow components

  16. Outflow velocity vs. SFR Voff ~ SFR0.3

  17. Martin et al. 2009 Spectra from LRIS on Keck I Using multi-components to fit each absorption line

  18. Through the fitting in last slides, they find that components with different velocity have different covering factoroutflow is accelerating

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