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The Evolution of the Large-scale ISM: Bubbles and Non-Equilibrium Ionization. M. de Avillez, D. Breitschwerdt Reporter: Sun Wei Nov 11, 2010. Introduction: CIE vs. NEI. CIE: frequent assumption good approximation in hot environments violating detailed balance - PowerPoint PPT Presentation
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M. de Avillez, D. BreitschwerdtReporter: Sun Wei
Nov 11, 2010
Introduction: CIE vs. NEICIE:
frequent assumptiongood approximation in hot environmentsviolating detailed balanceCan never be maintained in evolving plasma
NEI:Thermodynamic path dependentTime-dependent
Cooling processesElectron impact ionization Excitation-autoionizationRadiation & dielectronic recombinationCharge-exchange recombination & ionizationContinuum & line emissions
Cooling processes (Ref)Arnaud & Rothenflug 1985 Arnaud & Raymond 1992Mazzotta et al. 1998Mazzitelli & Mattioli 2002Mattioli et al. 2006, 2007Radiation & dielectronic recombination
Verner & Ferland 1996 (RR rate)Gu 2003 (DR rate)Bryans 2006Badnell 2003, 2006 (RR & DR data tables)
amdpp.phys.strath.ac.uk/tamoc/RR/ or …/DR/
NEI equations
Plasma Modeling: EPECAbundance: 10 elements and solar abundance
(Asplund et al. 2009)Initial Condition: isochoric full ionized gas
cooling from 1e9 K
Ionization Fraction
Cooling Function
CIE vs. NEI
Combination Lag
Disk-halo interaction simulation: bubbles and superbubbles
ConclusionCooling Function:
Time-dependentInitial condition dependentHistory dependent
Expanding vs. static: occurrence X-ray emission
Delayed Recombination: mismatch of recombination and dynamical time scales