Multiphase gas in elliptical galaxies: the role of Type Ia supernovae

Abstract

Massive elliptical galaxies harbor large amounts of hot gas ($T\gtrsim 10^6\mathrm{K}$) in their interstellar medium (ISM) but are typically quiescent in star formation. Active-galactic nuclei (AGNs) jets and Type Ia supernovae (SNIa) inject energy into the ISM which offsets its radiative losses and keeps it hot. SNIa deposit their energy locally within the galaxy compared to the larger few$\times 10\mathrm{kpc}$-scale AGN jets. In this study, we perform high-resolution ($512^3$) hydrodynamic simulations of a local ($1{\mathrm{kpc}}^3$) density-stratified patch of massive galaxies' ISM. We include radiative cooling and shell-averaged volume heating, as well as randomly exploding SNIa. We study the effect of different fractions of supernova heating (with respect to the net cooling rate), different initial ISM density/entropy (which controls the thermal-instability growth time $t_{\mathrm{ti}}$) and different degrees of stratification (which affects the free-fall time $t_{\mathrm{ff}}$). We find that the SNIa drive predominantly compressive turbulence in the ISM with a velocity dispersion ${\sigma }_v$ up to $40\mathrm{km}{s}^{-1}$ and logarithmic density dispersion ${\sigma }_s\sim 0.2$--$0.4$. These fluctuations trigger multiphase condensation in regions of the ISM where $\min (t_{\mathrm{ti}})/t_{\mathrm{ff}}\lesssim 0.6\exp (6{\sigma }_s)$, in agreement with theoretical expectations that large density fluctuations efficiently trigger multiphase gas formation. Since the SNIa rate is not self-adjusting, when the net cooling drops below the net heating rate the SNIa drive a hot wind which sweeps out most of the mass in our local model. Global simulations are required to assess the ultimate fate of this gas.

APJ accepted version, 25 pages, 13 figures, simulation movies at: https://www.youtube.com/playlist?list=PLuaNgQ1v_KMY1IK6dt9sEWJKK2DyAbDrc

References in corpus (30)

• Array Programming with NumPy
• The propagation of uncertainties in stellar population synthesis modeling I: The relevance of uncertain aspects of stellar evolution and the IMF to the derived physical properties of galaxies
• The EAGLE simulations of galaxy formation: calibration of subgrid physics and model variations
• Heating Hot Atmospheres with Active Galactic Nuclei
• The Athena++ Adaptive Mesh Refinement Framework: Design and Magnetohydrodynamic Solvers
• The Density Probability Distribution in Compressible Isothermal Turbulence: Solenoidal versus Compressive Forcing
• Momentum Injection by Supernovae in the Interstellar Medium
• Grackle: a Chemistry and Cooling Library for Astrophysics
• Turbulent Heating in Galaxy Clusters Brightest in X-rays
• CMasher: Scientific colormaps for making accessible, informative and 'cmashing' plots
• The Regulation of Cooling and Star Formation in Luminous Galaxies by AGN Feedback and the Cooling-Time/Entropy Threshold for the Onset of Star Formation
• Raining on black holes and massive galaxies: the top-down multiphase condensation model
• Anisotropic Thermal Conduction and the Cooling Flow Problem in Galaxy Clusters
• The Impact of Cosmic Rays on Thermal Instability in the Circumgalactic Medium
• Direct Detection of Black Hole-Driven Turbulence in the Centers of Galaxy Clusters
• Supernova Sweeping and Black-Hole Feedback in Elliptical Galaxies
• Preventing Star Formation in Early-Type Galaxies with Late-Time Stellar Heating
• Multiphase gas in the circumgalactic medium: relative role of $t_{\mathrm{cool}}/t_{\mathrm{ff}}$ and density fluctuations
• Turbulent density and pressure fluctuations in the stratified intracluster medium
• Non-Kolmogorov turbulence in multiphase intracluster medium driven by cold gas precipitation and AGN jets
• A Black-Hole Feedback Valve in Massive Galaxies
• Shatter or not: role of temperature and metallicity in the evolution of thermal instability
• A Graphical Interpretation of Circumgalactic Precipitation
• Inferences from surface brightness fluctuations of Zwicky 3146 via the Sunyaev-Zeldovich effect and X-ray observations
• The complex interplay of AGN jet-inflated bubbles and the intracluster medium
• Chemical enrichment of the ICM within the Virgo cluster I: radial profiles
• Production Efficiencies of Sound Waves in the Intracluster Medium Driven by AGN Jets
• Multiphase condensation in cluster halos: interplay of cooling, buoyancy and mixing
• Chemical evolution of elliptical galaxies I: supernovae and AGN feedback
• Modeling Photoionized Turbulent Material in the Circumgalactic Medium III: Effects of Co-rotation and Magnetic Fields

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