Talk presented at IAU Symposium 362 (IAUS362): Predictive Power of Computational Astrophysics as a Discovery Tool (Online Video-Conference), November 8, 2021, https://doi.org/10.6084/m9.figshare.17125607

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)

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 (Λi
) from Gnat & Ferland 2012.
 Heating Efficiencies from (Γi
) 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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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)