Fast Winds Drive Slow Shells: A Model for the Circumgalactic Medium as Galactic Wind-Driven Bubbles

Abstract

Successful models of the low redshift circumgalactic medium (CGM) must account for (1) a large amount of gas, (2) relatively slow gas velocities, (3) a high degree of metal enrichment, (4) the similar absorption properties around both star-forming and passive galaxies, and (5) the observationally inferred temperature and densities of the CGM gas. We show that galactic wind-driven bubbles can account for these observed properties. We develop a model describing the motion of bubbles driven by a hot, fast galactic wind characteristic of supernova energy injection. The bubble size grows slowly to hundreds of kiloparsecs over $5-10$ Gyr. For high star formation rates or high wind mass loading ${\dot{M}}_w/{\dot{M}}_{\star }$, the free-flowing hot wind, the shocked hot wind in the interior of the bubble, and the swept-up halo gas within the bubble shell can all radiatively cool and contribute to low-ionization state metal line absorption. We verify that if the free-flowing wind cools, the shocked wind does as well. We find effective mass loading factors of $(M_w+M_{\mathrm{swept}})/M_{\star }\sim 5-12$ as the bubbles sweep into the CGM. We predict cool gas masses, velocities, column densities, metal content, and absorption line velocities and linewidths of the bubble for a range of parameter choices. This picture can reproduce many of the COS-Halos and Keeney et al. (2017) observations of low-ionization state metal absorption lines around both star-forming and passive galaxies.

28 pages, 13 figures, accepted to MNRAS

References in corpus (26)

• The EAGLE simulations of galaxy formation: calibration of subgrid physics and model variations
• The Circumgalactic Medium
• The Mass-Metallicity Relation at z~2
• The effect of photo-ionization on the cooling rates of enriched, astrophysical plasmas
• A unified model for AGN feedback in cosmological simulations of structure formation
• The COS-Halos Survey: Physical Conditions and Baryonic Mass in the Low-Redshift Circumgalactic Medium
• Kiloparsec-scale outflows are prevalent among luminous AGN: outflows and feedback in the context of the overall AGN population
• The Origin of the Galaxy Mass-Metallicity Relation and Implications for Galactic Outflows
• The COS-Halos Survey: Metallicities in the Low-Redshift Circumgalactic Medium
• The COS-Dwarfs Survey: The Carbon Reservoir Around sub-L* Galaxies
• Do Hot Haloes Around Galaxies Contain the Missing Baryons?
• The abundance, distribution, and physical nature of highly ionized oxygen OVI, OVII, and OVIII in IllustrisTNG
• A Model for Star Formation, Gas Flows and Chemical Evolution in Galaxies at High Redshifts
• Extended Mid-Infrared Aromatic Feature Emission in M 82
• The Photon Underproduction Crisis
• Radiative cooling of swept up gas in AGN-driven galactic winds and its implications for molecular outflows
• Energy- and momentum-conserving AGN feedback outflows
• Transverse Sizes of CIV Absorption Systems Measured from Multiple QSO Sightlines
• Constrained semi-analytical models of Galactic outflows
• Long way to go: how outflows from large galaxies propagate through the hot halo gas
• The combined effect of AGN and supernovae feedback in launching massive molecular outflows in high-redshift galaxies
• On the Rayleigh-Taylor Instability of Radio Bubbles in Galaxy Clusters
• COS-Weak: Probing the CGM using analogs of weak Mg II absorbers at z < 0.3
• Feeding the fire: Tracing the mass-loading of 10^7 K galactic outflows with O VI absorption
• Numerical Simulations of Turbulent Molecular Clouds Regulated by Radiation Feedback Forces II: Radiation-Gas Interactions and Outflows
• Bursty star formation feedback and cooling outflows

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• Clustered Supernovae Drive Powerful Galactic Winds After Super-Bubble Breakout
• The Structure of Multiphase Galactic Winds
• A 100-kiloparsec wind feeding the circumgalactic medium of a massive compact galaxy
• Kinematics of Circumgalactic Gas: Feeding Galaxies and Feedback
• MeerKAT uncovers the physics of an Odd Radio Circle
• How Do Supernovae Impact the Circumgalactic Medium? I. Large-Scale Fountains Around a Milky Way-Like Galaxy
• Properties of the Simulated Circumgalactic Medium
• High-velocity outflows in massive post-starburst galaxies at z > 1
• Particle acceleration and multimessenger emission from starburst-driven galactic winds
• Exploring the Physical Properties of the Cool Circumgalactic Medium with a Semi-Analytic Model
• Entropy Driven Winds: Outflows and Fountains Lifted Gently by Buoyancy
• Figuring Out Gas & Galaxies In Enzo (FOGGIE) V: The Virial Temperature Does Not Describe Gas in a Virialized Galaxy Halo
• The Characteristic Momentum of Radiatively Cooling Energy-Driven Galactic Winds
• Kinematics, Structure, and Mass Outflow Rates of Extreme Starburst Galactic Outflows
• Exploring the Dust Content of Galactic Halos with Herschel III. NGC 891
• Galactic winds and bubbles from nuclear starburst rings
• The observable properties of cool winds from galaxies, AGN, and star clusters -- II. 3D models for the multiphase wind of M82
• Catastrophic Cooling in Superwinds. III. Non-equilibrium Photoionization
• Time-dependent galactic winds
• The Ionization and Dynamics of the Makani Galactic Wind
• A systematic study of galactic outflows via fluorescence emission: implications for their size and structure
• MOSEL Survey: Extremely weak outflows in EoR analogues at z=3-4
• Exploring the Dust Content of Galactic Halos with Herschel. IV. NGC 3079
• CGM${}^2$ $+$ CASBaH: The Mass Dependence of H~I Ly$\alpha$-Galaxy Clustering and the Extent of the CGM
• Interpreting Observations of Absorption Lines in the Circumgalactic Medium with a Turbulent Medium
• Physical Origins of Outflowing Cold Clouds in Local Star-forming Dwarf Galaxies
• Seeking Self-Regulating Simulations of Idealized Milky Way-Like Galaxies
• Evolution of Gas Flows along the Starburst to Post-Starburst to Quiescent Galaxy Sequence
• A High Signal-to-Noise HST Spectrum Toward J1009+0713: Precise Absorption Measurements in the CGM of Two Galaxies
• Kinematics of MgII Absorbers from the Redshift-space Distortion Around Massive Quiescent Galaxies
• Catastrophic Cooling in Superwinds. II. Exploring the Parameter Space
• Physical conditions and redshift evolution of optically thin C III absorbers: Low-z sample