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