Misty, patchy, and turbulent: constraining the cool circumgalactic medium with mCC

Abstract

The circumgalactic medium (CGM) is the largest baryon reservoir around galaxies, but its extent, mass, and temperature distribution remain uncertain. We propose that cool gas ($\sim 10^4$ K) in the CGM resides in clumpy structures referred to as cloud complexes (CCs) rather than uniformly filling the entire CGM volume. Each CC contains a mist of tiny cool cloudlets dispersed in a warm/hot medium ($\sim 10^5$ - $10^6$~K). Modeling CCs in the mist limit (unit area covering fraction within a CC) simplifies the calculation of observables like ion absorption columns, equivalent widths, compared to modeling individual cloudlets from first principles. Through Monte Carlo realizations of CCs, we explore how CC properties affect the observed variation in observables. We find that a power-law distribution of CCs ($d{N}_{\mathrm{CC}}/dR\propto R^{-1}$) with a total of $\sim 10^3$ CCs each with a radius of $\sim 10$ kpc and total cool gas mass of $\sim 10^{10}{M}_{\odot }$ reproduces MgII column density and equivalent width distribution trends with impact parameter for the COS-Halos sample (Werk+ 2013). We further show that the area-averaged MgII column density, combined with the area covering fraction, provides a robust proxy for estimating the cool CGM mass, independent of other model parameters. Modeling a larger number of (smaller size) cloudlets within a CC shows that line blending from individual cloudlets results in turbulent broadening on the CC scale. This work presents a practical framework for linking CGM models with observations of a multiphase CGM, illuminating the distribution of cool gas in galaxy halos.

accepted for publication in MNRAS

References in corpus (60)

• The chemical composition of the Sun
• Radiative transfer in a clumpy universe: IV. New synthesis models of the cosmic UV/X-ray background
• The Circumgalactic Medium
• A census of baryons in the Universe from localized fast radio bursts
• The COS-Halos Survey: Physical Conditions and Baryonic Mass in the Low-Redshift Circumgalactic Medium
• The Quiescent Intracluster Medium in the Core of the Perseus Cluster
• The COS-Halos Survey: An Empirical Description of the Metal-Line Absorption in the Low-Redshift Circumgalactic Medium
• Thermal Instability in Gravitationally-Stratified Plasmas: Implications for Multi-Phase Structure in Clusters and Galaxy Halos
• The radial and azimuthal profiles of Mg II absorption around 0.5 < z < 0.9 zCOSMOS galaxies of different colors, masses and environments
• The COS-Halos Survey: Metallicities in the Low-Redshift Circumgalactic Medium
• Probing Galactic Halos with Fast Radio Bursts
• A Global Model For Circumgalactic and Cluster-Core Precipitation
• The COS-Halos Survey: Origins of the Highly Ionized Circumgalactic Medium of Star-Forming Galaxies
• Resolving small-scale cold circumgalactic gas in TNG50
• Photospheric Abundances: Problems, Updates, Implications
• The Direct Detection of Cool, Metal-Enriched Gas Accretion onto Galaxies at z ~ 0.5
• The survival of gas clouds in the Circumgalactic Medium of Milky Way-like galaxies
• The Atacama Cosmology Telescope: Combined kinematic and thermal Sunyaev-Zel'dovich measurements from BOSS CMASS and LOWZ halos
• MAGIICAT II. General Characteristics of the MgII Absorbing Circumgalactic Medium
• New synthesis models of consistent extragalactic background light over cosmic time
• Thermal Instability with Anisotropic Thermal Conduction and Adiabatic Cosmic Rays: Implications for Cold Filaments in Galaxy Clusters
• What Determines the Incidence and Extent of MgII Absorbing Gas Around Galaxies?
• A Universal Density Structure for Circum-Galactic Gas
• Survival and mass growth of cold gas in a turbulent, multiphase medium
• MUSE Analysis of Gas around Galaxies (MAGG) -- II: Metal-enriched halo gas around z~1 galaxies
• The COS-Halos Survey: Keck LRIS and Magellan MagE Optical Spectroscopy
• The Impact of Cosmic Rays on Thermal Instability in the Circumgalactic Medium
• Project AMIGA: The Circumgalactic Medium of Andromeda
• Implications of the large OVI columns around low-redshift $L_{\ast }$ galaxies
• Circumgalactic Mg II Emission from an Isotropic Starburst Galaxy Outflow Mapped by KCWI
• On the Structure of Hot Gas in Halos: Implications for the Lx-Tx Relation & Missing Baryons
• A Complete Census of Circumgalactic MgII at Redshift z<~ 0.5
• MusE GAs FLOw and Wind (MEGAFLOW) VIII. Discovery of a MgII emission halo probed by a quasar sightline
• An FRB Sent Me a DM: Constraining the Electron Column of the Milky Way Halo with Fast Radio Burst Dispersion Measures from CHIME/FRB
• High Resolution STIS/HST and HIRES/Keck Spectra of Three Weak MgII Absorbers Toward PG 1634+706
• Hot Extended Galaxy Halos Around Local L* Galaxies From Sunyaev-Zeldovich Measurements
• Observational signatures of a warped disk associated with cold-flow accretion
• Characterizing the abundance, properties, and kinematics of the cool circumgalactic medium of galaxies in absorption with SDSS DR16
• Velocity structure functions in multiphase turbulence: interpreting kinematics of H$\alpha$ filaments in cool core clusters
• Physical Properties of Complex C Halo Clouds
• Bipolar Outflows out to 10~kpc for Massive Galaxies at Redshift $z\approx 1$
• Cool circumgalactic gas of passive galaxies from cosmological inflow
• Exploring the Physical Properties of the Cool Circumgalactic Medium with a Semi-Analytic Model
• The Cosmic Ultraviolet Baryon Survey (CUBS) VI: Connecting Physical Properties of the Cool Circumgalactic Medium to Galaxies at $z\approx 1$
• Detection of thermal Sunyaev-Zel'dovich Effect in the circumgalactic medium of low-mass galaxies -- a surprising pattern in self-similarity and baryon sufficiency
• Clumpiness of Observed and Simulated Cold Circumgalactic Gas
• Probing the Extended Gaseous Regions of M31 with Quasar Absorption Lines
• Modeling multi-phase gases in cosmological simulations using compressible multi-fluid hydrodynamics
• An emission map of the disk-circumgalactic medium transition in starburst IRAS 08339+6517
• Characterising the turbulent multiphase halos with periodic box simulations
• Directly constraining the spatial coherence of the $z\sim 1$ circumgalactic medium
• On The Effect of Environment on Line Emission from the Circumgalactic Medium
• CMB distortion from circumgalactic gas
• MusE GAs FLOw and Wind (MEGAFLOW) XIII. Cool gas traced by MgII around isolated galaxies
• A galactic outflow traced by its extended Mg II emission out to a $\sim 30$ kpc radius in the Hubble Ultra Deep Field with MUSE
• Zooming in on the Circumgalactic Medium with GIBLE: Tracing the Origin and Evolution of Cold Clouds
• Spatially Resolved Circumgalactic Medium around a Star-Forming Galaxy Driving a Galactic Outflow at $z\approx 0.8$
• Upper Limits on the Mass of Cool Gas in the Circumgalactic Medium of Dwarf Galaxies
• Mass and Metal Flows in Isolated IllustrisTNG Halos
• FOGGIE X: Characterizing the Small-Scale Structure of the CGM and its Imprint on Observables

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