The Highly Ionized Circumgalactic Medium is Kinematically Uniform Around Galaxies

Abstract

The circumgalactic medium (CGM) traced by OVI $\lambda \lambda 1031,1037$ doublet absorption has been found to concentrate along the projected major and minor axes of the host galaxies. This suggests that OVI traces accreting and outflowing gas, respectively, which are key components of the baryon cycle of galaxies. We investigate this further by examining the kinematics of 29 OVI absorbers associated with galaxies at $0.13<z_{\mathrm{gal}}<0.66$ as a function of galaxy color, inclination, and azimuthal angle. Each galaxy was imaged with HST and the absorption was detected in COS/HST spectra of nearby ($D<200$ kpc) background quasars. We use the pixel-velocity two-point correlation function to characterize the velocity spread of the absorbers, which is a method used previously for a sample of MgII absorber--galaxy pairs. The absorption velocity spread for OVI is more extended than MgII, which suggests that the two ions trace differing components of the CGM. Also contrary to MgII, the OVI absorption velocity spreads are similar regardless of galaxy color, inclination, and azimuthal angle. This indicates that the kinematics of the high ionization gas is not strongly influenced by the present star formation activity in the galaxy. The kinematic homogeneity of OVI absorption and its tendency to be observed mainly along the projected galaxy major and minor axes is likely due to varying ionization conditions and gas densities about the galaxy. Gas in intermediate azimuthal angles may be ionized out of the OVI phase, possibly resulting in an azimuthal angle dependence on the distribution of gas in higher ionization states.

12 pages, 6 figures, 2 tables. Accepted for publication in The Astrophysical Journal on November 22nd, 2016

References in corpus (50)

• Gas-regulation of galaxies: the evolution of the cosmic sSFR, the metallicity-mass-SFR relation and the stellar content of haloes
• The Large, Oxygen-Rich Halos of Star-Forming Galaxies Are A Major Reservoir of Galactic Metals
• Mass, Metal, and Energy Feedback in Cosmological Simulations
• The DEEP Groth Strip Survey II. Hubble Space Telescope Structural Parameters of Galaxies in the Groth Strip
• The COS-Halos Survey: An Empirical Description of the Metal-Line Absorption in the Low-Redshift Circumgalactic Medium
• Evidence for Ubiquitous Collimated Galactic-Scale Outflows along the Star-Forming Sequence at z~0.5
• A Budget and Accounting of Metals at z~0: Results from the COS-Halos Survey
• The radial and azimuthal profiles of Mg II absorption around 0.5 < z < 0.9 zCOSMOS galaxies of different colors, masses and environments
• Demographics and Physical Properties of Gas Out/Inflows at 0.4 < z < 1.4
• Probing the IGM/Galaxy Connection V: On the Origin of Lya and OVI Absorption at z<0.2
• Physical properties of galactic winds using background quasars
• Characterizing the Circumgalactic Medium of Nearby Galaxies with HST/COS and HST/STIS Absorption-Line Spectroscopy
• Signatures of Cool Gas Fueling a Star-Forming Galaxy at Redshift 2.3
• Tracing Outflows and Accretion: A Bimodal Azimuthal Dependence of MgII Absorption
• Bimodality of low-redshift circumgalactic O VI in non-equilibrium EAGLE zoom simulations
• The Persistence of Cool Galactic Winds in High Stellar Mass Galaxies Between z~1.4 and ~1
• The Kinematic Connection Between QSO-Absorbing Gas and Galaxies at Intermediate Redshift
• Orbiting Circum-galactic Gas as a Signature of Cosmological Accretion
• Tracing Inflows and Outflows with Absorption Lines in Circumgalactic Gas
• The Direct Detection of Cool, Metal-Enriched Gas Accretion onto Galaxies at z ~ 0.5
• On the possible environmental effect in distributing heavy elements beyond individual gaseous halos
• MAGIICAT II. General Characteristics of the MgII Absorbing Circumgalactic Medium
• The dependence of Galactic outflows on the properties and orientation of zCOSMOS galaxies at z ~ 1
• Halo Gas and Galaxy Disk Kinematics Derived from Observations and LCDM Simulations of MgII Absorption Selected Galaxies at Intermediate Redshift
• The Population of Weak MgII Absorbers. II The Properties of Single-Cloud Systems
• Optical properties and spatial distribution of MgII absorbers from SDSS image stacking
• The Relationship Between Intergalactic HI/OVI and Nearby (z<0.017) Galaxies
• Metal-enriched, sub-kiloparsec gas clumps in the circumgalactic medium of a faint z = 2.5 galaxy
• The Properties of Low Redshift Intergalactic O VI Absorbers Determined from High S/N Observations of 14 QSOs with the Cosmic Origins Spectrograph
• MAGIICAT I. The MgII Absorber-Galaxy Catalog
• Morphological Properties of z~0.5 Absorption-Selected Galaxies: The Role of Galaxy Inclination
• The Kinematics of Intermediate Redshift Mg II Absorbers
• The COS-Halos Survey: Keck LRIS and Magellan MagE Optical Spectroscopy
• MAGIICAT V. Orientation of Outflows and Accretion Determine the Kinematics and Column Densities of the Circumgalactic Medium
• The Azimuthal Dependence of Outflows and Accretion Detected Using OVI Absorption
• Halo Gas and Galaxy Disk Kinematics of a Volume-Limited Sample of MgII Absorption-Selected Galaxies at z~0.1
• Modeling the distribution of Mg II absorbers around galaxies using Background Galaxies & Quasars
• New Perspective on Galaxy Outflows From the First Detection of Both Intrinsic and Traverse Metal-Line Absorption
• MAGIICAT III. Interpreting Self-Similarity of the Circumgalactic Medium with Virial Mass using MgII Absorption
• An Extreme Metallicity, Large-Scale Outflow from a Star-Forming Galaxy at z ~ 0.4
• The properties of the cool circumgalactic gas probed with the SDSS, WISE and GALEX surveys
• Probing the IGM-galaxy connection at z<0.5 II. New insights into the galaxy environments of OVI absorbers in PKS 0405-123
• Direct Insights into Observational Absorption Line Analysis Methods of the Circumgalactic Medium Using Cosmological Simulations
• The Gas-Galaxy Connection at z = 0.35: OVI and HI Absorption Towards J0943+0531
• Halo Mass Dependence of HI and OVI Absorption: Evidence for Differential Kinematics
• Probing the large and massive CGM of a galaxy at z ~ 0.2 using a pair of quasars
• Clues to the nature of high-redshift OVI absorption systems from their (lack of) small-scale structure
• Molecular Hydrogen Absorption from the Halo of a z ~ 0.4 Galaxy
• MAGIICAT IV. Kinematics of the Circumgalactic Medium and Evidence for Quiescent Evolution Around Red Galaxies
• HST/COS detection of a Ne VIII absorber towards PG 1407+265: An unambiguous tracer of collisionally ionized hot gas?

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• The abundance, distribution, and physical nature of highly ionized oxygen OVI, OVII, and OVIII in IllustrisTNG
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• Morphological and Rotation Structures of Circumgalactic Mg II Gas in the EAGLE Simulation and the Dependence on Galaxy Properties
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• How identifying circumgalactic gas by line-of-sight velocity instead of the location in 3D space affects O VI measurements
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• Evidence for galaxy quenching in the green valley caused by a lack of a circumgalactic medium
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• Spatial Distribution of OVI Covering Fractions in the Simulated Circumgalactic Medium
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