Hydrodynamic Simulations of Starburst-driven Superwinds

Talk presented at Challenges and Innovations in Computational Astrophysics - III (ChaICA-III; Virtual), 21 June 2021

Transcript

1. Ashkbiz Danehkar
   Department of Astronomy, University of Michigan
   danehkar@umich.edu
   In Collaborations with: Sally Oey, and Will Gray
   Challenges and Innovations in Computational Astrophysics - III, June 21, 2021
   Hydrodynamic Simulations of
   Starburst-driven Superwinds
   Superbubble in NGC 3079 (Credit: X-ray:NASA/CXC/UMich/J-T Li;Optical:NASA/STScI)
   

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   Outline
    Superwinds & Superbubbles
   – Superwind Theory: Adiabatic Solution
   – Superbubble & Superwind Theory
    Catastrophic Cooling
   – Superwind Theory: Radiative Solution
    Hydrodynamic Simulations
    Photoionization Modeling
   – Diagnostic Diagrams
    Hydrodynamic and Photoionization Results
    Summary & Future Directions
   

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   Superwinds & Superbubbles
   Superwind and Superbubble in NGC 3079
   (Credit: X-ray:NASA/CXC/UMich/J-T Li;Optical:NASA/STScI)
   

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   Superwinds & Superbubbles
   Superwind and Superbubble (Romero+ 2018, Strickland+ 2003)
   

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   Superwind Theory: Adiabatic
   Adiabatic Solutions
   – Adiabatic Wind (γ=5/3)
   – Chevalier & Clegg 1985
   Chevalier & Clegg 1985
   

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   Superwind Theory: Adiabatic
   Adiabatic Bubble Solutions
   – Castor+ 1975
   – Weaver+ 1977
   Weaver+ 1977
   Weaver+ 1977
   

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   Superwind Theory
   Gray, Oey, Silich + 2019
   

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   Catastrophic Cooling
   NGC 2366
   Green Pea analog!
   [O II], [O III] and Continuum (Oey+ 2017)
   Mrk 71
   Oey + 2017
   

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   Catastrophic Cooling
   Super Star Cluster NGC 5253 (Turner et al. 2017)
   

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    Superwind Theory: Radiative
    
    Radiative Solutions
    – Silich et al. 2004
    – With Radiative Cooling
    Silich + 2004
    

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    Superwind Theory: Radiative
    Radiative Cooling
    Silich + 2004
    Silich + 2004
    

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    Hydrodynamic Simulations
    Danehkar, Oey, Gray, 2021
    

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    Hydrodynamic Simulations
    Danehkar, Oey, Gray, 2021
    

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    Hydrodynamic Simulations
    MAIHEM Package built on FLASH code (Will + 2015)
    Temperature Density
    Danehkar, Oey, Gray, 2021
    

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    Hydrodynamic Simulations
    Radiative Cooling
    
    adiabatic bubble (AB), adiabatic pressure-confined (AP)
    
    catastrophic cooling (CC), catastrophic cooling bubble (CB)
    Temperature discrepancy factor (fT = Tw / Tadi)
    Danehkar, Oey, Gray, 2021
    

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    Danehkar, Oey, Gray, 2021
    Hydrodynamic Simulations
    

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    Photoionization Modeling
    Danehkar, Oey, Gray, 2021
    Photoionization
    + Hydro Collisional Ionization
    

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    Photoionization Modeling
    Danehkar, Oey, Gray, 2021
    PI (Pure Photoionization), CPI (Photoionization + Hydro Collisional Ionization)
    

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    Diagnostic Diagrams
    Emission Lines of Superwinds
    Danehkar, Oey, Gray, 2021
    Gray, Oey, Silich + 2019
    

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    BPT Diagnostic Diagrams
    Danehkar, Oey, Gray, 2021
    Optical Emission Lines (radiation-bounded)
    

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

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

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    Model Results
    Danehkar, Oey, Gray, 2021
     Hydrodynamics & Photoionization Results
    https://superwinds.astro.lsa.umich.edu/
    

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    Summary
     Superwind Theory
    – Adiabatic Solution (Chevalier & Clegg 85)
    – Radiative Solution (Silich + 2004)
     Hydrodynamic Simulations
    – Catastrophic Cooling (Gray, Oey, Silich, 2019)
    – Radiative Cooling increases with (Danehkar, Oey, Gray, 2021):
    • higher mass-loading, lower outflow velocity, higher metallicity
     Photoionization Modeling (Photoionization + Hydro Collisional Ionization)
    – Emission lines predicted for adiabatic and cooling outflows
    – BPT & UV Diagnotic Diagrams
     Future Directions
    – Non-equilibrium Photoionization (Photoionization + NEI; next work)
    – 2-D simulations: Instability-induced gas clumping
    

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    Thank you for your attention
    Superbubble in NGC 3079 (Credit: X-ray:NASA/CXC/UMich/J-T Li;Optical:NASA/STScI)
    

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