Download presentation
Presentation is loading. Please wait.
Published byPenelope Kitchings Modified over 9 years ago
1
Feedback: in the form of outflow
2
AGN driven outflow
6
M82 Blue: Chandra Red: Spitzer Cyan: Optical
22
Star formation driven outflow
23
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.
24
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)
25
From X-ray: Hot Gas Escapes from Dwarf Starbursts Martin 1999, Heckman et al 2000, Martin 2004 Rotation Speed Tremonti et al. 2004 V c = 130 km/s
26
From optical absorption lines --NaD(5890,5896A) Low- ionization potential 5.1eV (Martin et al. 2005, 2006) V = -96 km/s V = -435 km/s
27
Circular velocityStar formation rate Outflow velocity isothermal escape speed From optical absorption lines (Rupke et al. 2005a,b,c) Murray et al. 2004, Martin 2005
28
Stack spectrum and stellar continuum Mg I He I Na I
29
Two-component fit of ISM Na D Line center shift: outflow velocity Voff Line strength (EW): covering factor Cf Line width b Line ratio τ 0
30
Two-component fit of ISM Na D Line center shift: outflow velocity Voff Line strength (EW): covering factor Cf Line width b Line ratio τ 0
31
Inclination effect face on edge on
32
Isolate the main driver of the observed correlation: Disk-like components
33
Isolate the main driver of the observed correlation: outflow components
34
Outflow velocity vs. SFR V off ~ SFR 0.3
35
Martin et al. 2009 Spectra from LRIS on Keck I Using multi-components to fit each absorption line
36
Through the fitting in last slides, they find that components with different velocity have different covering factor outflow is accelerating
Similar presentations
© 2024 SlidePlayer.com Inc.
All rights reserved.