Metal-enriched, sub-kiloparsec gas clumps in the circumgalactic medium of a faint z = 2.5 galaxy

Abstract

We report the serendipitous detection of a 0.2 L${}^{\ast }$, Lyman-$\alpha$ emitting galaxy at redshift 2.5 at an impact parameter of 50 kpc from a bright background QSO sightline. A high-resolution spectrum of the QSO reveals a partial Lyman-limit absorption system ($N_{\mathrm{HI}}=10^{16.94\pm 0.10}$ cm${}^{-2}$) with many associated metal absorption lines at the same redshift as the foreground galaxy. Using photoionization models that carefully treat measurement errors and marginalise over uncertainties in the shape and normalisation of the ionizing radiation spectrum, we derive the total hydrogen column density $N_{\mathrm{H}}=10^{19.4\pm 0.3}$ cm${}^{-2}$, and show that all the absorbing clouds are metal enriched, with $Z=0.1$-$0.6Z_{\odot }$. These metallicities and the system's large velocity width ($436$ kms${}^{-1}$) suggest the gas is produced by an outflowing wind. Using an expanding shell model we estimate a mass outflow rate of $\sim 5M_{\odot }$yr${}^{-1}$. Our photoionization model yields extremely small sizes ($<$100-500 pc) for the absorbing clouds, which we argue are typical of high column density absorbers in the circumgalactic medium (CGM). Given these small sizes and extreme kinematics, it is unclear how the clumps survive in the CGM without being destroyed by hydrodynamic instabilities. The small cloud sizes imply that even state-of-the-art cosmological simulations require more than a $1000$-fold improvement in mass resolution to resolve the hydrodynamics relevant for cool gas in the CGM.

arXiv commentFixed an incorrect reference to D'Odorico & Petitjean 2001, A&A, 370, 729. Data and code used for the paper are at https://github.com/nhmc/LAE

References in corpus (118)

• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• Cosmic Star Formation History
• Statistical Properties of X-ray Clusters: Analytic and Numerical Comparisons
• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• Galaxies on FIRE (Feedback In Realistic Environments): Stellar Feedback Explains Cosmologically Inefficient Star Formation
• Galactic star formation and accretion histories from matching galaxies to dark matter haloes
• A simple model to interpret the ultraviolet, optical and infrared emission from galaxies
• Radiative transfer in a clumpy universe: IV. New synthesis models of the cosmic UV/X-ray background
• Virial shocks in galactic haloes?
• The Mass-Metallicity Relation at z~2
• The Structure and Kinematics of the Circum-Galactic Medium from Far-UV Spectra of z~2-3 Galaxies
• On the Maximum Luminosity of Galaxies and Their Central Black Holes: Feedback From Momentum-Driven Winds
• The Rest Frame Optical Spectra of Lyman Break Galaxies: Star Formation, Extinction, Abundances, and Kinematics
• Fundamental differences between SPH and grid methods
• Ubiquitous outflows in DEEP2 spectra of star-forming galaxies at z=1.4
• A Survey of Star-Forming Galaxies in the z=1.4-2.5 `Redshift Desert': Overview
• The COS-Halos Survey: Physical Conditions and Baryonic Mass in the Low-Redshift Circumgalactic Medium
• A Steep Faint-End Slope of the UV Luminosity Function at z~2-3: Implications for the Global Stellar Mass Density and Star Formation in Low Mass Halos
• Galaxies and Intergalactic Matter at Redshift z~3: Overview
• Gaseous Galaxy Halos
• Multi-Phase Galaxy Formation: High Velocity Clouds and the Missing Baryon Problem
• The 2013 Release of Cloudy
• Multi-Wavelength Constraints on the Cosmic Star Formation History from Spectroscopy: the Rest-Frame UV, H-alpha, and Infrared Luminosity Functions at Redshifts 1.9<z<3.4
• New Observations of the Interstellar Medium in the Lyman Break Galaxy MS 1512-cB58
• Metallicity of the intergalactic medium using pixel statistics. II. The distribution of metals as traced by C IV
• A cosmic web filament revealed in Lyman-alpha emission around a luminous high-redshift quasar
• Diffuse Lyman Alpha Emitting Halos: A Generic Property of High Redshift Star Forming Galaxies
• Evidence for Ubiquitous Collimated Galactic-Scale Outflows along the Star-Forming Sequence at z~0.5
• Time-Dependent Ionization in Radiatively Cooling Gas
• 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
• Early Metal Enrichment of the Intergalactic Medium by Pregalactic Outflows
• Model-independent insights into the nature of the Lyman-alpha forest and the distribution of matter in the universe
• New Measurements of the Ionizing Ultraviolet Background over 2 < z < 5 and Implications for Hydrogen Reionization
• Ly Alpha-Emitting Galaxies at z=3.1: L* Progenitors Experiencing Rapid Star Formation
• Demographics and Physical Properties of Gas Out/Inflows at 0.4 < z < 1.4
• UV to Mid-IR Observations of Star-forming Galaxies at z~2: Stellar Masses and Stellar Populations
• An Empirical Characterization of Extended Cool Gas Around Galaxies Using MgII Absorption Features
• Absorption line systems in simulated galaxies fed by cold streams
• Molecular Gas in M82: Resolving the Outflow and Streamers
• The Connection Between Galaxies and Intergalactic Absorption Lines at Redshift 2<z<3
• Physical properties of galactic winds using background quasars
• Characterizing the Circumgalactic Medium of Nearby Galaxies with HST/COS and HST/STIS Absorption-Line Spectroscopy
• Radiation pressure from massive star clusters as a launching mechanism for super-galactic winds
• Signatures of Cool Gas Fueling a Star-Forming Galaxy at Redshift 2.3
• Evolution of the Intergalactic Opacity: Implications for the Ionizing Background, Cosmic Star Formation, and Quasar Activity
• A Population of Faint Extended Line Emitters and the Host Galaxies of Optically Thick QSO Absorption Systems
• The Distribution of Metallicity in the IGM at z~2.5: OVI and CIV Absorption in the Spectra of 7 QSOs
• The Bimodal Metallicity Distribution of the Cool Circumgalactic Medium at z<1
• The circumgalactic medium of massive galaxies at z~3: a test for stellar feedback, galactic outflows, and cold streams
• Massive star formation and evolution in starburst galaxies: mid-infrared spectroscopy with ISO-SWS
• Tracing Outflows and Accretion: A Bimodal Azimuthal Dependence of MgII Absorption
• A Composite Extreme Ultraviolet QSO Spectrum from the Far Ultraviolet Spectroscopic Explorer
• Escape of about five per cent of Lyman-alpha photons from high-redshift star-forming galaxies
• Detection of Pristine Gas Two Billion Years after the Big Bang
• Multi-phase High-Velocity Clouds toward HE 0226-4110 and PG 0953+414
• The Direct Detection of Cool, Metal-Enriched Gas Accretion onto Galaxies at z ~ 0.5
• Quasars Probing Quasars I: Optically Thick Absorbers Near Luminous Quasars
• The Nature of Starbursts : II. The Duration of Starbursts in Dwarf Galaxies
• The Magnetic Rayleigh-Taylor Instability in Three Dimensions
• Gaseous Galactic Halos and QSO Absorption Line Systems
• The Hidden Mass and Large Spatial Extent of a Poststarburst Galaxy Outflow
• The Abundances of Nitrogen and Oxygen in Damped Lyman Alpha Systems
• HST-COS Observations of AGN. I. Ultraviolet Composite Spectra of the Ionizing Continuum and Emission Lines
• Non-Equilibirum ionisation and cooling of metal-enriched gas in the presence of a photo-ionisation background
• Quasars Probing Quasars VI. Excess HI Absorption Within One Proper Mpc of z~2 Quasars
• Are high-redshift DLA galxies Lyman-break galaxies?
• Observations of Chemically Enriched QSO Absorbers near z ~ 2.3 Galaxies: Galaxy-Formation Feedback Signatures in the IGM
• A large population of metal-rich, compact, intergalactic C IV absorbers - Evidence for poor small-scale metal mixing
• Quasars Probing Quasars II: The Anisotropic Clustering of Optically Thick Absorbers around Quasars
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• On the Physical Origin of OVI Absorption-Line Systems
• The Population of Weak MgII Absorbers. II The Properties of Single-Cloud Systems
• Quasars Probing Quasars III: New Clues to Feedback, Quenching, and the Physics of Massive Galaxy Formation
• Gas Motion Study of Lya Emitters at z~2 Using UV and Optical Spectral Lines
• Galactic and Circumgalactic OVI and its Impact on the Cosmological Metal and Baryon Budgets at 2<z<3.5
• Discovery of a compact gas-rich DLA galaxy at z = 2.2: evidences for a starburst-driven outflow
• A SINFONI Integral Field Spectroscopy Survey for Galaxy Counterparts to Damped Lyman-alpha Systems - I. New Detections and Limits for Intervening and Associated Absorbers
• Predictions for the relation between strong HI absorbers and galaxies at redshift 3
• Dissecting the properties of optically-thick hydrogen at the peak of cosmic star formation history
• Identification of a Galaxy Responsible for a High-Redshift Damped Ly-alpha Absorption System
• A Substantial Mass of Cool, Metal-Enriched Gas Surrounding the Progenitors of Modern-Day Ellipticals
• Rest-frame ultraviolet spectrum of the gravitationally lensed galaxy `the 8 o'clock arc': stellar and interstellar medium properties
• Comprehensive Study of a z = 2.35 DLA Galaxy: Mass, Metallicity, Age, Morphology and SFR from HST and VLT
• An HST/WFC3-IR Morphological Survey of Galaxies at z = 1.5-3.6: II. The Relation between Morphology and Gas-Phase Kinematics
• Redistributing hot gas around galaxies: do cool clouds signal a solution to the overcooling problem?
• The Galaxy Counterparts of the two high-metallicity DLAs at z=2.412 and z=2.583 towards Q0918+1636
• The Varied Fates of z~2 Star-forming Galaxies
• Confronting Simulations of Optically Thick Gas in Massive Halos with Observations at z=2-3
• The VLT LBG Redshift Survey - III. The clustering and dynamics of Lyman-break galaxies at z ~ 3
• Metal-Poor, Cool Gas in the Circumgalactic Medium of a z = 2.4 Star-Forming Galaxy: Direct Evidence for Cold Accretion?
• IGM Emission Observations with the Cosmic Web Imager: II. Discovery of Extended, Kinematically-Linked Emission around SSA22 Lyman-alpha Blob 2
• VLT LBG Redshift Survey II: Interactions between galaxies and the IGM at z ~3
• Nonequilibrium ionization states and cooling rates of the photoionized enriched gas
• Calibrating Galaxy Redshifts Using Absorption by the Surrounding Intergalactic Medium
• The nature of z ~ 2.3 Lyman-alpha emitters
• The VLT LBG Redshift Survey I: Clustering and Dynamics of ~1000 Galaxies at z~3
• A new deuterium abundance measurement from a damped Ly-alpha system at z_abs = 3.025
• The filling factor of intergalactic metals at redshift z=3
• Measurement of a Magnetic Field in a Leading Arm High Velocity Cloud
• Empirical predictions for (sub-)millimeter line and continuum deep fields
• The Unchanging Circumgalactic Medium Over the Past 11 Billion Years
• Spectral shape of the UV ionizing background and HeII absorption at redshifts 1.8 < z < 2.9
• Kinematics of Gas in Lyman Alpha Nebulae
• A SINFONI Integral Field Spectroscopy Survey for Galaxy Counterparts to Damped Lyman-alpha Systems - IV. Masses and Gas Flows
• The High-Ion Content and Kinematics of Low-Redshift Lyman Limit Systems
• High-Velocity Clouds and the Local Intergalactic Medium
• A compact, metal-rich, kpc-scale outflow in FBQS J0209-0438: Detailed diagnostics from HST/COS extreme UV observations
• The Evolution of Gas Clouds Falling in the Magnetized Galactic Halo: High Velocity Clouds (HVCs) Originated in the Galactic Fountain
• The case against large intensity fluctuations in the z ~ 2.5 HeII Lyman-alpha forest
• A high molecular fraction in a sub-damped absorber at z=0.56
• High-resolution 21-cm observations of low-column density gas clumps in the Milky Way halo
• Extended and Filamentary Lyman Alpha Emission from the Formation of a Protogalactic Halo at z=2.63
• Estimating the Correlation Length r_0 from the Number of Galaxy Pairs with Similar Redshifts
• The Dark Matter Haloes and Host Galaxies of MgII Absorbers at z~1
• Reconstructing the intergalactic UV background with QSO absorption lines

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• The impact of stellar feedback on the structure, size and morphology of galaxies in Milky Way size dark matter haloes
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• A Universal Density Structure for Circum-Galactic Gas
• Inspiraling Halo Accretion Mapped in Lyman-$\alpha$ Emission around a $z\sim 3$ Quasar
• The physical properties of z>2 Lyman limit systems: new constraints for feedback and accretion models
• The Impact of Cosmic Rays on Thermal Instability in the Circumgalactic Medium
• The Azimuthal Dependence of Outflows and Accretion Detected Using OVI Absorption
• Baryon Cycling in the Low-Redshift Circumgalactic Medium: A Comparison of Simulations to the COS-Halos Survey
• MUSE searches for galaxies near very metal-poor gas clouds at z~3: new constraints for cold accretion models
• Deep HeII and CIV Spectroscopy of a Giant Lyman alpha Nebula: Dense Compact Gas Clumps in the Circumgalactic Medium of a z~2 Quasar
• Column Density Profiles of Multi-Phase Gaseous Halos
• The Cosmic Evolution of the Metallicity Distribution of Ionized Gas Traced by Lyman Limit Systems
• Circumgalactic Mg II Emission from an Isotropic Starburst Galaxy Outflow Mapped by KCWI
• Quasars Probing Quasars VIII. The Physical Properties of the Cool Circumgalactic Medium Surrounding z ~ 2-3 Massive Galaxies Hosting Quasars
• NIHAO VIII: Circum-galactic medium and outflows - The puzzles of HI and OVI gas distributions
• Low-metallicity Absorbers Account for Half of the Dense Circumgalactic Gas at z < 1
• Dissecting the Gaseous Halos of z~2 Damped Ly$\alpha$ Systems with Close Quasar Pairs
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• MUSE Analysis of Gas around Galaxies (MAGG) -- I: Survey design and the environment of a near pristine gas cloud at z~3.5
• Mg II Absorption at 2<z<7 with Magellan/FIRE, III. Full Statistics of Absorption Towards 100 High-Redshift QSOs
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• Resolving shocks and filaments in galaxy formation simulations: effects on gas properties and star formation in the circumgalactic medium
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