The Cosmic Ultraviolet Baryon Survey (CUBS) IV: The Complex Multiphase Circumgalactic Medium as Revealed by Partial Lyman Limit Systems

Abstract

We present a detailed study of two partial Lyman limit systems (pLLSs) of neutral hydrogen column density $N_{\mathrm{H}\mathrm{I}}\approx (1-3)\times 10^{16}{\mathrm{cm}}^{-2}$ discovered at $z=0.5$ in the Cosmic Ultraviolet Baryon Survey (CUBS). Available far-ultraviolet spectra from the Hubble Space Telescope Cosmic Origins Spectrograph and optical echelle spectra from MIKE on the Magellan Telescopes enable a comprehensive ionization analysis of diffuse circumgalactic gas based on resolved kinematics and abundance ratios of atomic species spanning five different ionization stages. These data provide unambiguous evidence of kinematically aligned multi-phase gas that masquerades as a single-phase structure and can only be resolved by simultaneous accounting of the full range of observed ionic species. Both systems are resolved into multiple components with inferred $\alpha$-element abundance varying from $[\alpha /\text{H}]\approx -0.8$ to near solar and densities spanning over two decades from $\log n_{\mathrm{H}}{\mathrm{cm}}^{-3}\approx -2.2$ to $<-4.3$. Available deep galaxy survey data from the CUBS program taken with VLT/MUSE, Magellan/LDSS3-C and Magellan/IMACS reveal that the $z=0.47$ system is located 55 kpc from a star-forming galaxy with prominent Balmer absorption of stellar mass $M_{\star }\approx 2\times 10^{10}{M}_{\odot }$, while the $z=0.54$ system resides in an over-dense environment of 11 galaxies within 750 kpc in projected distance, with the most massive being a luminous red galaxy of $M_{\star }\approx 2\times 10^{11}{M}_{\odot }$ at 375 kpc. The study of these two pLLSs adds to an emerging picture of the complex, multiphase circumgalactic gas that varies in chemical abundances and density on small spatial scales in diverse galaxy environments. The inhomogeneous nature of metal enrichment and density revealed in observations must be taken into account in theoretical models of diffuse halo gas.

Accepted for publication in MNRAS, 27 pages, 21 figures

References in corpus (91)

• emcee: The MCMC Hammer
• Planck 2015 results. XIII. Cosmological parameters
• Stellar population synthesis at the resolution of 2003
• On the variation of the Initial Mass Function
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• X-ray spectral modelling of the AGN obscuring region in the CDFS: Bayesian model selection and catalogue
• Radiative transfer in a clumpy universe: IV. New synthesis models of the cosmic UV/X-ray background
• The Circumgalactic Medium
• The Evolution of the Stellar Mass Functions of Star-Forming and Quiescent Galaxies to z = 4 from the COSMOS/UltraVISTA Survey
• The MUSE second-generation VLT instrument
• Inferring the star-formation histories of massive quiescent galaxies with BAGPIPES: Evidence for multiple quenching mechanisms
• Optimal Techniques in Two-dimensional Spectroscopy: Background Subtraction for the 21st Century
• Spectral Classification and Redshift Measurement for the SDSS-III Baryon Oscillation Spectroscopic Survey
• The COS-Halos Survey: Physical Conditions and Baryonic Mass in the Low-Redshift Circumgalactic Medium
• The Mass-Metallicity Relation with the Direct Method on Stacked Spectra of SDSS Galaxies
• The Cosmic Origins Spectrograph
• Highly-Ionized High-Velocity Gas in the Vicinity of the Galaxy
• The 2013 Release of Cloudy
• The Cosmic Baryon Cycle and Galaxy Mass Assembly in the FIRE Simulations
• The COS-Halos Survey: Rationale, Design, and A Census of Circumgalactic Neutral Hydrogen
• Time-Dependent Ionization in Radiatively Cooling Gas
• Thermal Instability in Gravitationally-Stratified Plasmas: Implications for Multi-Phase Structure in Clusters and Galaxy Halos
• The Gaseous Environment of High-z Galaxies: Precision Measurements of Neutral Hydrogen in the Circumgalactic Medium of z ~ 2-3 Galaxies in the Keck Baryonic Structure Survey
• The radial and azimuthal profiles of Mg II absorption around 0.5 < z < 0.9 zCOSMOS galaxies of different colors, masses and environments
• Stellar mass -- halo mass relation and star formation efficiency in high-mass halos
• An Empirical Characterization of Extended Cool Gas Around Galaxies Using MgII Absorption Features
• Absorption line systems in simulated galaxies fed by cold streams
• The COS-Halos Survey: Metallicities in the Low-Redshift Circumgalactic Medium
• Figuring Out Gas & Galaxies in Enzo (FOGGIE). I. Resolving Simulated Circumgalactic Absorption at 2 < z < 2.5
• A Cosmic UV/X-ray Background Model Update
• The Evolution of Early-Type Galaxies in Distant Clusters II: Internal Kinematics of 55 Galaxies in the z=0.33 Cluster CL1358+62
• A Global Model For Circumgalactic and Cluster-Core Precipitation
• The Bimodal Metallicity Distribution of the Cool Circumgalactic Medium at z<1
• The COS-Halos Survey: Origins of the Highly Ionized Circumgalactic Medium of Star-Forming Galaxies
• The Origins of the Circumgalactic Medium in the FIRE Simulations
• Tracing Inflows and Outflows with Absorption Lines in Circumgalactic Gas
• QSO Metal Absorption Systems at High Redshift and the Signature of Hierarchical Galaxy Formation
• Metal flows of the circumgalactic medium, and the metal budget in galactic halos
• Properties of gas in and around galaxy haloes
• Neutral hydrogen in galaxy halos at the peak of the cosmic star formation history
• Characterizing Circumgalactic Gas around Massive Ellipticals at z~0.4 - II. Physical Properties and Elemental Abundances
• On the possible environmental effect in distributing heavy elements beyond individual gaseous halos
• The Gaseous Extent of Galaxies and the Origin of \lya Absorption Systems. III. Hubble Space Telescope Imaging of \lya-Absorbing Galaxies at z < 1
• Non-Equilibirum ionisation and cooling of metal-enriched gas in the presence of a photo-ionisation background
• Observations of Chemically Enriched QSO Absorbers near z ~ 2.3 Galaxies: Galaxy-Formation Feedback Signatures in the IGM
• Abundance Profiles and Kinematics of Damped Lyman-alpha Absorbing Galaxies at z < 0.65
• The Gaseous Extent of Galaxies and the Origin of Lya Absorption Systems. V. Optical and Near-Infrared Photometry of Lya-absorbing Galaxies at z < 1
• Metal-enriched, sub-kiloparsec gas clumps in the circumgalactic medium of a faint z = 2.5 galaxy
• The Physical Conditions of Intermediate Redshift MgII Absorbing Clouds from Voigt Profile Analysis
• Probing the IGM-Galaxy Connection at z < 0.5 I: A Galaxy Survey in QSO Fields and a Galaxy-Absorber Cross-Correlation Study
• The large and small scale properties of the intergalactic gas in the Slug Ly-alpha nebula revealed by MUSE HeII emission observations
• MAGIICAT I. The MgII Absorber-Galaxy Catalog
• The Column Density, Kinematics, and Thermal State of Metal-Bearing Gas within the Virial Radius of z~2 Star-Forming Galaxies in the Keck Baryonic Structure Survey
• Verifying the mass-metallicity relation in damped Lyman-alpha selected galaxies at 0.1<z<3.2
• Predictions for the Angular Dependence of Gas Mass Flow Rate and Metallicity in the Circumgalactic Medium
• Cooling flow solutions for the circumgalactic medium
• The multiphase circumgalactic medium traced by low metal ions in EAGLE zoom simulations
• Low-Redshift Lyman Limit Systems as Diagnostics of Cosmological Inflows and Outflows
• The extent of chemically enriched gas around star-forming dwarf galaxies
• Clocking the Evolution of Post-Starburst Galaxies: Methods and First Results
• An Extreme Metallicity, Large-Scale Outflow from a Star-Forming Galaxy at z ~ 0.4
• The Cosmic Ultraviolet Baryon Survey (CUBS) I. Overview and the diverse environments of Lyman limit systems at z<1
• Multi-phase Circum-Galactic Medium probed with MUSE and ALMA
• First results from SMAUG: Uncovering the Origin of the Multiphase Circumgalactic Medium with a Comparative Analysis of Idealized and Cosmological Simulations
• A Complete Census of Circumgalactic MgII at Redshift z<~ 0.5
• Characterizing Circumgalactic Gas around Massive Ellipticals at z ~ 0.4 I. Initial Results
• AGN proximity zone fossils and the delayed recombination of metal lines
• Low-metallicity Absorbers Account for Half of the Dense Circumgalactic Gas at z < 1
• Post-Starburst Galaxies in SDSS-IV MaNGA
• Probing the IGM-galaxy connection at z<0.5 II. New insights into the galaxy environments of OVI absorbers in PKS 0405-123
• Relationship between the Metallicity of the Circumgalactic Medium and Galaxy Orientation
• A SINFONI Integral Field Spectroscopy Survey for Galaxy Counterparts to Damped Lyman-alpha Systems - VI. Metallicity and Geometry as Gas Flow Probes
• The COS CGM Compendium. III: Metallicity and Physical Properties of the Cool Circumgalactic Medium at z<1
• The COS CGM Compendium. II: Metallicities of the Partial and Lyman Limit Systems at z<1
• The Cosmic Ultraviolet Baryon Survey (CUBS) -- III. Physical properties and elemental abundances of Lyman limit systems at $z<1$
• MUSE-ALMA Halos V: Physical properties and environment of z < 1.4 HI quasar absorbers
• The COS Absorption Survey of Baryon Harbors: Unveiling the Physical Conditions of Circumgalactic Gas through Multiphase Bayesian Ionization Modeling
• The Relationship Between Galaxy ISM and Circumgalactic Gas Metallicities
• The Incidence of Low-Metallicity Lyman-Limit Systems at z~3.5: Implications for the Cold-Flow Hypothesis of Baryonic Accretion
• MusE GAs FLOw and Wind (MEGAFLOW) V. The dust/metallicity-anisotropy of the Circum-Galactic Medium
• Cloud-by-cloud, multiphase, Bayesian modeling: Application to four weak, low ionization absorbers
• Exploring Multi-Modal Distributions with Nested Sampling
• The COS Absorption Survey of Baryon Harbors: The Galaxy Database and Cross-Correlation Analysis of OVI Systems
• Characterizing circumgalactic gas around massive ellipticals at z~0.4 III. The galactic environment of a chemically-pristine Lyman limit absorber
• Outskirts of Distant Galaxies In Absorption
• Inhomogeneous metal enrichment at z \sim 1.9: the Lyman limit systems in the spectrum of the HDF-S quasar
• On the radial profile of gas-phase Fe/α ratio around distant galaxies
• Predominantly Low Metallicities Measured in a Stratified Sample of Lyman Limit Systems at z=3.7
• The Cosmic Ultraviolet Baryon Survey (CUBS) II: Discovery of an H${}_2$-Bearing DLA in the Vicinity of an Early-Type Galaxy at z = 0.576
• Disentangling the multi-phase circumgalactic medium shared between a dwarf and a massive star-forming galaxy at z~0.4
• A partial Lyman limit system tracing intragroup gas at $z\approx 0.8$ towards HE1003+0149

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• Chemical abundance scaling relations for multiple elements in z~2-3 star-forming galaxies
• The Cosmic Ultraviolet Baryon Survey (CUBS) V: On the Thermodynamic Properties of the Cool Circumgalactic Medium at $z<1$
• KODIAQ-Z: Metals and Baryons in the Cool Intergalactic and Circumgalactic Gas at 2.2<z<3.6
• The Cosmic Ultraviolet Baryon Survey (CUBS) VI: Connecting Physical Properties of the Cool Circumgalactic Medium to Galaxies at $z\approx 1$
• Empirical constraints on the turbulence in QSO host nebulae from velocity structure function measurements
• The CGM${}^2$ Survey: Quenching and the Transformation of the Circumgalactic Medium
• MUSE-ALMA Haloes VIII: Statistical Study of Circumgalactic Medium Gas
• MUSE-ALMA Haloes VII: Survey Science Goals & Design, Data Processing and Final Catalogues
• The Bimodal Absorption System Imaging Campaign (BASIC) I. A Dual Population of Low-metallicity Absorbers at z $<1$
• The MUSE Ultra Deep Field (MUDF). III. Hubble Space Telescope WFC3 Grism Spectroscopy and Imaging
• MUSE-ALMA Halos XI: Gas flows in the circumgalactic medium
• Effect of cosmic rays and ionizing radiation on observational ultraviolet plasma diagnostics in the circumgalactic medium
• MUSE-ALMA Haloes XIII. Molecular gas in $z\sim 0.5$ HI-selected galaxies
• MUSEQuBES: Physical conditions, origins, and multi-element abundances of the circumgalactic medium of an isolated, star-forming dwarf galaxy at z=0.57
• The Thermodynamic and Kinematic Evolution of Circumgalactic Gas around $z=1$ in the IllustrisTNG model