Highly ionised plasma in the Large Magellanic Cloud: Evidence for outflows and a possible galactic wind

Abstract

Based on an analysis of the interstellar highly ionised species C IV, Si IV, N V, and O VI observed in the FUSE and HST/STIS E140M spectra of four hot stars in the Large Magellanic Cloud (LMC), we find evidence for a hot LMC halo fed by energetic outflows from the LMC disk and even possibly an LMC galactic wind. Signatures for such outflows are the intermediate and high-velocity components (v_LSR>100 km/s) relative to the LMC disk observed in the high- and low-ion absorption profiles. The stellar environments produce strong, narrow (T<20,000 K) components of C IV and Si IV associated with the LMC disk; in particular they are likely signatures of H II regions and expanding shells. Broad components are observed in the profiles of C IV, Si IV, and O VI with their widths implying hot, collisionally ionised gas at temperatures of a few times 100,000 K. There is a striking similarity in the O VI/C IV ratios for the broad LMC and high-velocity components, suggesting much of the material at v_LSR>100 km/s is associated with the LMC. The velocity of the high-velocity component is large enough to escape altogether the LMC, polluting the intergalactic space between the LMC and the Milky Way. The observed high-ion ratios of the broad LMC and high-velocity components are consistent with those produced in conductive interfaces; such models are also favored by the apparent kinematically coupling between the high and the weakly ionised species.

Accepted for publication in the MNRAS

References in corpus (4)

• Spitzer Survey of the Large Magellanic Cloud, Surveying the Agents of a Galaxy's Evolution (SAGE) I: Overview and Initial Results
• Time-Dependent Ionization in Radiatively Cooling Gas
• A Chandra/ACIS Study of 30 Doradus II. X-ray Point Sources in the Massive Star Cluster R136 and Beyond
• Possible Detection of OVI from the LMC Superbubble N70

Cited by in corpus (42)

• Cool Outflows in Galaxies and their Implications
• The Role of Dwarf Galaxy Interactions in Shaping the Magellanic System and Implications for Magellanic Irregulars
• The Origin of the Magellanic Stream and Its Leading Arm
• Probing Galactic Halos with Fast Radio Bursts
• The COS/UVES Absorption Survey of the Magellanic Stream. III: Ionization, Total Mass, and Inflow Rate onto the Milky Way
• On the Nature of Velocity Fields in High z Galaxies
• Evidence for a Massive, Extended Circumgalactic Medium Around the Andromeda Galaxy
• An HST/COS legacy survey of high-velocity ultraviolet absorption in the Milky Way's circumgalactic medium and the Local Group
• High-velocity clouds as streams of ionized and neutral gas in the halo of the Milky Way
• The Extension of the Transition Temperature Plasma into the Lower Galactic Halo
• High-Ion Absorption in Seven GRB Host Galaxies at z=2-4: Evidence for both Circumburst Plasma and Outflowing Interstellar Gas
• The HST/ACS+WFC3 Survey for Lyman Limit Systems II: Science
• Dust input from AGB stars in the Large Magellanic Cloud
• Numerical Study of Turbulent Mixing Layers with Non-Equilibrium Ionization Calculations
• A Hubble Space Telescope Study of Lyman Limit Systems: Census and Evolution
• C IV absorption in damped and sub-damped Lyman-alpha systems: correlations with metallicity and implications for galactic winds at z~2-3
• Observation of interstellar lithium in the low-metallicity Small Magellanic Cloud
• The High Velocity Gas toward Messier 5: Tracing Feedback Flows in the Inner Galaxy
• The Magellanic Corona and the formation of the Magellanic Stream
• Metallicity and Physical Conditions in the Magellanic Bridge
• The Connection between a Lyman Limit System, a very strong OVI Absorber, and Galaxies at z~0.203
• Properties and Origin of the High-Velocity Gas Toward the Large Magellanic Cloud
• Fundamental Properties of the Highly Ionized Plasmas in the Milky Way
• METAL: The Metal Evolution, Transport, and Abundance in the Large Magellanic Cloud Hubble program. I. Overview and Initial Results
• Revealing the Milky Way's Hidden Circumgalactic Medium with the Cosmic Origins Spectrograph Quasar Database for Galactic Absorption Lines
• Cosmic Ray Driven Outflows from the Large Magellanic Cloud: Contributions to the LMC Filament
• Origin(s) of the Highly Ionized High-Velocity Clouds Based on Their Distances
• Chemical Abundances in the Leading Arm of the Magellanic Stream
• The effects of LMC-mass environments on their dwarf satellite galaxies in the FIRE simulations
• Down-the-barrel and transverse observations of the Large Magellanic Cloud: evidence for a symmetrical galactic wind on the near and far sides of the galaxy
• Simulating Anisotropic Thermal Conduction in Supernova Remnants, Implications for the Interstellar Medium
• The Surprisingly Constant Strength of O VI Absorbers over Cosmic Time
• Multiphase Plasma in Sub-Damped Lyman Alpha Systems: A Hidden Metal Reservoir
• Probing feedback in protogalaxies: Multiphase gas in a DLA at z~2.4
• Present-day Galactic Evolution: Low-metallicity, Warm, Ionized Gas Inflow Associated with High-Velocity Cloud Complex A
• Survey of O VI absorption in the Large Magellanic Cloud
• Mapping the Supernovae Driven Winds of the Large Magellanic Cloud in H$\alpha$ Emission I
• Warm gas accretion onto the Galaxy
• High-ion absorption in the proximate damped Lyman-alpha system toward Q0841+129
• The Diffuse Ionized Gas of the Large Magellanic Cloud
• Braving the Storm: Quantifying Disk-wide Ionized Outflows in the Large Magellanic Cloud with ULLYSES
• The distribution and kinematics of interstellar O~{\small VI} in the Milky Way}