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Starburst Galaxies: Outflows of Metal and Energy into the IGM. Sun Wei 4/15/2009. Superwind Feedback. Galaxy Formation Galactic Winds (Veilleux et al. 2005) Plasma in the Halo Pollution of Intergalactic Medium (IGM) (Songaila 1997; Simcoe et al. 2003). Key Question:. - PowerPoint PPT Presentation
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Sun Wei4/15/2009
Superwind FeedbackGalaxy Formation
Galactic Winds (Veilleux et al. 2005)
Plasma in the Halo
Pollution of Intergalactic Medium (IGM) (Songaila 1997; Simcoe et al. 2003)
Key Question:What is the contribution of mass, metals and
energy from starburst galaxies to the
Intergalactic Medium?
OutlineIntro to Superwind FeedbackFeedback from Starburst-Driven Superwinds
to IGMCreating a Future for Superwind StudiesSome Recent Works on M82
SuperwindPower:
Massive star winds
Core collapse SNe (Type II)
Creation:
Metal-enriched plasma
Cool entrained gas (Howk & Savage 1999)
Feedback to IGM
powerful superwind in lower mass galaxies? (Ferrara & Tolstoy 2000; Keeney et al. 2006 vs Strickland et al. 2006)
Key InformationVelocity
Chemical Composition
Chemical feedback
Plasma in the halo
Metal enrichment of the IGM
Cooling efficiency
Velocity
2.4log3.8 : Warm,3.8log3.6 :Hot TT
VelocityWarm neutral and ionized gas: 200~1000km
s-1 (Shapley et al. 2003; Rupke et al. 2005; Martin 2005)
near galactic escape velocity!
Hot gas: no direct observational measurement
Require better spectral resolution
a Schematic Diagram
Face-on:
line centroid
shifts
line broadening
Edge-0n:
Spatially-
resolved
X-ray
spectroscopy
Observation RequirementBetter spectral resolution! chemical composition velocity informationSame good spatial resolution
International X-ray Obervatory?
-1s km 100
5"~ :resolution spatial
eV 5.2E
Recent Work on M82Starburst-driven superwind (observation &
model) Mass-loading Metallicity of plasma in the halo/Cap Entrained cool gasRef: Strickland & Heckman 2007, ApJ
658,258 Strickland & Heckman 2009, arXiv
0903.4175 Tsuru et al. 2007, PASJ 59, 269
AbundanceO & Fe are lower than Si & S in Cap from
ASCA &XMM-Newton
Weak 6.69 keV Fe Heα line: too weak even treated Fe as solar abundance
Explanation: 1. plasma is multi-phase; 2. plasma is not in collisional
ionization equilibrium (CIE).
Key Question:What is the contribution of mass, metals and
energy from starburst galaxies to the Intergalactic
Medium?
A high sensitivity X-ray imaging spectrometer with
a velocity accuracy of for composition,
energetics and flow rates diagnostics.
Experimental Requirement:
km/s 100