Probing the physicochemical properties of the Leo Ring and the Leo I group

Abstract

We present an absorption line study of the physical and chemical properties of the Leo HI Ring and the Leo I Group as traced by 11 quasar sightlines spread over a 600 kpc X 800 kpc region. Using HST/COS G130/G160 archival observations as constraints, we couple cloud-by-cloud, multiphase, Bayesian ionization modeling with galaxy property information to determine the plausible origin of the absorbing gas along these sightlines. We search for absorption in the range 600 km/s - 1400 km/s consistent with the kinematics of the Leo Ring/Group. We find absorption plausibly associated with the Leo Ring towards five sightlines. Along three other sightlines, we find absorption likely to be associated with individual galaxies, intragroup gas, and/or large-scale filamentary structure. The absorption along these five sightlines is stronger in metal lines than expected from individual galaxies, indicative of multiple contributions, and of the complex kinematics of the region. We also identify three sightlines within a 7-degree X 6-degree field around the Leo Ring, along which we do not find any absorption. We find that the metallicities associated with the Leo Ring are generally high, with values between solar and several times solar. The inferred high metallicities are consistent with the origin of the ring as tidal debris from a major galaxy merger.

arXiv comment26 pages of main text, 77 pages of supplementary material. Accepted for publication in MNRAS

References in corpus (54)

• Astropy: A Community Python Package for Astronomy
• The Origin of the Mass--Metallicity Relation: Insights from 53,000 Star-Forming Galaxies in the SDSS
• The SIMBAD astronomical database
• X-ray spectral modelling of the AGN obscuring region in the CDFS: Bayesian model selection and catalogue
• THINGS: The HI Nearby Galaxy Survey
• The Circumgalactic Medium
• The SDSS View of the Palomar-Green Bright Quasar Survey
• The Large, Oxygen-Rich Halos of Star-Forming Galaxies Are A Major Reservoir of Galactic Metals
• An updated analytic model for the attenuation by the intergalactic medium
• 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
• The COS-Halos Survey: An Empirical Description of the Metal-Line Absorption in the Low-Redshift Circumgalactic Medium
• The radial and azimuthal profiles of Mg II absorption around 0.5 < z < 0.9 zCOSMOS galaxies of different colors, masses and environments
• Optical Continuum and Emission-Line Variability of Seyfert 1 Galaxies
• Characterizing the Circumgalactic Medium of Nearby Galaxies with HST/COS and HST/STIS Absorption-Line Spectroscopy
• The COS-Dwarfs Survey: The Carbon Reservoir Around sub-L* Galaxies
• The Abundance Properties of Nearby Late-Type Galaxies.I. The Data
• Characterizing Circumgalactic Gas around Massive Ellipticals at z~0.4 - II. Physical Properties and Elemental Abundances
• Measurement of fast bars in a sample of early-type barred galaxies
• Mining Circumgalactic Baryons in the Low-Redshift Universe
• Voigt Profile Fitting to Quasar Absorption Lines: An Analytic Approximation to the Voigt-Hjerting Function
• The Local Lya Forest. III. Relationship between Lya Absorbers and Galaxies, Voids and Superclusters
• MAGIICAT I. The MgII Absorber-Galaxy Catalog
• Neutral Hydrogen Clouds in the M81/M82 Group
• Photon underproduction crisis: Are QSOs sufficient to resolve it?
• Spatially Resolved Velocity Maps of Halo Gas Around Two Intermediate-redshift Galaxies
• Discrete clouds of neutral gas between the galaxies M31 and M33
• Galaxy Group at z=0.3 Associated with the Damped Lyman Alpha System Towards Quasar Q1127-145
• CGM${}^2$ I: The Extent of the Circumgalactic Medium Traced by Neutral Hydrogen
• MAGIICAT VI. The MgII Intragroup Medium is Kinematically Complex
• A collisional origin for the Leo ring
• Metal-enriched halo gas across galaxy overdensities over the last 10 billion years
• The Cosmic Ultraviolet Baryon Survey (CUBS) -- III. Physical properties and elemental abundances of Lyman limit systems at $z<1$
• A Giant Intragroup Nebula Hosting a Damped Lya Absorber at z=0.313
• The COS Absorption Survey of Baryon Harbors: Unveiling the Physical Conditions of Circumgalactic Gas through Multiphase Bayesian Ionization Modeling
• The Power Spectrum of the Lyman-$\alpha$ Forest at z < 0.5
• HST/COS Spectra of Three QSOs That Probe The Circumgalactic Medium of a Single Spiral Galaxy: Evidence for Gas Recycling and Outflow
• Massive HI clouds with no optical counterparts as high-density regions of intragroup HI rings and arcs
• The Leo I Cloud: Secular nuclear evolution of NGC 3379, NGC 3384, and NGC 3368?
• Spatially Resolved Metal Gas Clouds
• Halo Mass Dependence of HI and OVI Absorption: Evidence for Differential Kinematics
• A Survey of Analogs to Weak MgII Absorbers in the Present
• Cloud-by-cloud, multiphase, Bayesian modeling: Application to four weak, low ionization absorbers
• Probing the Extended Gaseous Regions of M31 with Quasar Absorption Lines
• VoigtFit: A Python package for Voigt profile fitting
• The evolution of the low-density HI intergalactic medium from z=3.6 to 0: Data, transmitted flux and HI column density
• HST/COS Observations of Quasar Outflows in the 500 -- 1050 Å Rest Frame: VI Wide, Energetic Outflows in SDSS J0755+2306
• The COS-legacy survey of C IV absorbers: properties and origins of the intervening systems
• Evidence for galaxy quenching in the green valley caused by a lack of a circumgalactic medium
• On the relation between Lya absorbers and local galaxy filaments
• Detection of Metal-Rich, Cool-Warm Gas in the Outskirts of Galaxy Clusters
• Discovery of extremely low-metallicity circumgalactic gas at $z=0.5$ toward Q0454-220
• Probing Large Galaxy Halos at $z\sim 0$ with Automated $\mathrm{Ly}\alpha$-Absorption Matching
• A partial Lyman limit system tracing intragroup gas at $z\approx 0.8$ towards HE1003+0149

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• MUSE-ALMA Haloes VIII: Statistical Study of Circumgalactic Medium Gas
• MUSE-ALMA Halos XI: Gas flows in the circumgalactic medium
• The pride of lions around Messier 105
• Kinematic analysis of an Ultra-Strong MgII absorber at z~1.13 linking to Circumgalactic Gas Structures
• The Halo21 Absorption Modeling Challenge: Lessons From "Observing" Synthetic Circumgalactic Absorption Spectra