Hydrodynamic Simulations and Time-dependent Photoionization Modeling of Starburst-driven Superwinds

Talk presented at IAU Symposium 362 (IAUS362): Predictive Power of Computational Astrophysics as a Discovery Tool (Online Video-Conference), November 8, 2021

Transcript

1. Hydrodynamic Simulations and
   Hydrodynamic Simulations and
   Time-dependent Photoionization Modeling of
   Time-dependent Photoionization Modeling of
   Starburst-driven Superwinds
   Starburst-driven Superwinds
   Ashkbiz Danehkar
   Department of Astronomy, University of Michigan
   danehkar@umich.edu
   In Collaborations with: Sally Oey, and Will Gray
   IAUS 362: Predictive Power of Computational Astrophysics as a Discovery Tool, November 8, 2021
   Image Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)
   

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2. 08 Nov 2021 IAUS362
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   Cooling Superwinds
   M82 (Cigar Galaxy)
   M82 (Cigar Galaxy)
   Image Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)
   

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   Starburst-driven Superwinds
   Starburst-driven Outflows (Romero+ 2018, Strickland+ 2003)
   

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   Superwind Theory
   
   Adiabatic Analytic Solution
   – Chevalier & Clegg 1985
   
   Radiative Semi-analytic Solutions
   – Silich + 2004
   – With Radiative Cooling
   Silich + 2004
   

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   Superwind Theory
   Radiative Cooling
   Silich + 2004
   Silich + 2004
   

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   Superwind Theory
   Different Wind Regions, as defined by Weaver+ 1977
   

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   Hydrodynamic Simulations
   Danehkar, Oey, Gray, 2021 (ApJ 921, 91)
   

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   Hydrodynamic Simulations
   Cooling Function (Λ) and Photo-Heating Function (Γ):
   the Atomic Chemistry and Cooling Package MAIHEM (Gray + 2019):
   
   Ion-by-ion Cooling Efficiencies from (Λ
   i
   ) from Gnat & Ferland 2012.
   
   Heating Efficiencies from (Γ
   i
   ) made with photoionization cross sections
   from Verner & Yakovlev 1995, and Verner, Ferland, et al. 1996.
   

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   Hydrodynamic Simulations
   Model Grids: https://superwinds.astro.lsa.umich.edu/
   Temperature Density
   Danehkar, Oey, Gray, 2021 (ApJ 921,91)
   

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    Hydrodynamic Simulations
    
    Adiabatic Bubble (AB)
    
    Catastrophic Cooling Bubble (CB)
    
    Catastrophic Cooling (CC)
    Danehkar, Oey, Gray, 2021
    

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    Hydrodynamic Simulations
    
    Adiabatic Bubble (AB), Adiabatic Pressure-Confined (AP)
    
    Catastrophic Cooling (CC), Catastrophic Cooling Bubble (CB)
    Temperature discrepancy factor (fT = Tw / Tadi)
    Danehkar, Oey, Gray, 2021 (ApJ 921,91)
    

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12. 08 Nov 2021 IAUS362
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    Danehkar, Oey, Gray, 2021
    Hydrodynamic Simulations
    (Danehkar, Oey, Gray, 2021, ApJ 921, 91)
    

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    Photoionization Modeling (CIE+PIE=CPI)
    Danehkar, Oey, Gray, 2021 (ApJ 921, 91)
    Photoionization
    + Collisional Ionization
    

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    Photoionization Modeling (CIE+PIE=CPI)
    Danehkar, Oey, Gray, 2021 (ApJ 921, 91)
    PIE (Pure Photoionization), CIE+PIE=CPI (Photoionization + Collisional Ionization)
    

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    Photoionization Modeling (NEI+PIE=NPI)
    Danehkar, Oey, Gray, 2021 (in preparation)
    Photoionization
    + Non-equilibrium Ionization
    

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    Photoionization Modeling (NEI+PIE=NPI)
    PIE (Pure Photoionization), NEI+PIE=NPI (Photoionization + Non-equilibrium Ionization)
    CIE+PIE=CPI (Photoionization + Collisional Ionization), Danehkar, Oey, Gray, 2021 (in preparation)
    

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    Optical & UV Diagnostic Diagrams
    Emission Lines of Superwinds
    Danehkar, Oey, Gray, 2021 (ApJ 921, 91)
    

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    Optical BPT Diagrams
    Danehkar, Oey, Gray, 2021 (ApJ 921, 91)
    Optical Emission Lines (radiation-bounded)
    

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    UV Diagnostic Diagrams
    Danehkar, Oey, Gray, 2021 (ApJ 921, 91)
    UV Emission Lines (radiation-bounded)
    

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    UV Diagnostic Diagrams
    UV Emission Lines (radiation-bounded)
    Danehkar, Oey, Gray, 2021 (ApJ 921, 91)
    

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    Future Direction: Radiative Transfer
    Implementation of detailed Radiative Transfer (RT) calculations
     Improvement of radiative cooling and photo-heating processes
     Stellar flux at a given distance (e.g. Klassen + 2014):
     Inclusion of radiation pressure:
    Included in MAIHEM Need RT calculations
    

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    Concluding Remarks
    
    Starburst-driven SuperWinds
    – Adiabatic Solution (Chevalier & Clegg 85)
    – Radiative Solution (Silich + 2004)
    
    Non-equilibrium Hydrodynamic Simulations of Superwinds
    – MAIHEM Cooling Package (Gray + 2019): Radiative Cooling + Photo-Heating
    – Exploring the Parameter (Danehkar, Oey, Gray, 2021, ApJ 921, 91)
    
    Photoionizaion Modeling
    – CIE+PIE (Danehkar et al. ApJ, 2021, ApJ 921, 91)
    – NEI+PIE (Danehkar, et al. in preparation)
    
    Future Direction
    – Detailed Implementation Radiative Transfer: Improved Photoionization
    

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    Thank you for your attention
    M82 (Cigar Galaxy)
    M82 (Cigar Galaxy)
    Image Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)
    

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