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

Abstract

We compare the properties of gas flows on both the near and far side of the Large Magellanic Cloud (LMC) disk using Hubble Space Telescope UV absorption-line observations toward an AGN behind (transverse) and a star within (down-the-barrel) the LMC disk at an impact parameter of 3.2 kpc. We find that even in this relatively quiescent region gas flows away from the disk at speeds up to $\sim$100 km/s in broad and symmetrical absorption in the low and high ions. The symmetric absorption profiles combined with previous surveys showing little evidence that the ejected gas returns to the LMC and provide compelling evidence that the LMC drives a global, large-scale outflow across its disk, which is the likely result of a recent burst of star formation in the LMC. We find that the outflowing gas is multiphase, ionized by both photoionization (SiII and SiIII) and collisional ionization (SiIV and CIV). We estimate a total mass and outflow rate to be $>10^7$ Msun and $>0.4$ Msun/yr. Since the velocity of this large-scale outflow does not reach the LMC escape velocity, the gas removal is likely aided by either ram-pressure stripping with the Milky Way halo or tidal interactions with the surrounding galaxies, implying that the environment of LMC-like or dwarf galaxies plays an important role in their ultimate gas starvation. Finally we reassess the mass and plausible origins of the high-velocity complex toward the LMC given its newly-determined distance that places it in the lower Milky Way halo and sky-coverage that shows it extends well beyond the LMC disk.

Accepted to ApJ

References in corpus (28)

• Ubiquitous outflows in DEEP2 spectra of star-forming galaxies at z=1.4
• Cold gas accretion in galaxies
• The COS-Halos Survey: Physical Conditions and Baryonic Mass in the Low-Redshift Circumgalactic Medium
• Momentum Injection by Supernovae in the Interstellar Medium
• Time-Dependent Ionization in Radiatively Cooling Gas
• The cold gaseous halo of NGC 891
• Is the SMC Bound to the LMC? The HST Proper Motion of the SMC
• Characterizing the Circumgalactic Medium of Nearby Galaxies with HST/COS and HST/STIS Absorption-Line Spectroscopy
• The Origin of the Magellanic Stream and Its Leading Arm
• The COS-Dwarfs Survey: The Carbon Reservoir Around sub-L* Galaxies
• On the Shoulders of Giants: Properties of the Stellar Halo and the Milky Way Mass Distribution
• The COS/UVES Absorption Survey of the Magellanic Stream. III: Ionization, Total Mass, and Inflow Rate onto the Milky Way
• GASS: The Parkes Galactic All-Sky Survey. Update: improved correction for instrumental effects and new data release
• Ram Pressure Stripping of the Large Magellanic Cloud's Disk as a Probe of the Milky Way's Circumgalactic Medium
• Mining Circumgalactic Baryons in the Low-Redshift Universe
• Evidence for a Massive, Extended Circumgalactic Medium Around the Andromeda Galaxy
• The Magellanic Stream System: I. Ram-pressure tails and the relics of the collision between the Magellanic Clouds
• Numerical Study of Turbulent Mixing Layers with Non-Equilibrium Ionization Calculations
• New Perspective on Galaxy Outflows From the First Detection of Both Intrinsic and Traverse Metal-Line Absorption
• C IV absorption in damped and sub-damped Lyman-alpha systems: correlations with metallicity and implications for galactic winds at z~2-3
• The origin of the high-velocity cloud complex C
• The High Velocity Gas toward Messier 5: Tracing Feedback Flows in the Inner Galaxy
• Metallicity and Physical Conditions in the Magellanic Bridge
• Kinematics of diffuse ionized gas in the disk halo interface of NGC 891 from Fabry-Pérot observations
• Properties and Origin of the High-Velocity Gas Toward the Large Magellanic Cloud
• High-velocity gas towards the LMC resides in the Milky Way halo
• Possible Detection of OVI from the LMC Superbubble N70
• Large and small-scale structure of the Intermediate and High Velocity Clouds towards the LMC and SMC

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• The Origins of the Circumgalactic Medium in the FIRE Simulations
• The survival of gas clouds in the Circumgalactic Medium of Milky Way-like galaxies
• An HST/COS legacy survey of high-velocity ultraviolet absorption in the Milky Way's circumgalactic medium and the Local Group
• A Review of Recent Observations of Galactic Winds Driven by Star Formation
• HST/COS Observations of Ionized Gas Accretion at the Disk-halo Interface of M33
• METAL: The Metal Evolution, Transport, and Abundance in the Large Magellanic Cloud Hubble program. I. Overview and Initial Results
• Cosmic Ray Driven Outflows from the Large Magellanic Cloud: Contributions to the LMC Filament
• Chemical Abundances in the Leading Arm of the Magellanic Stream
• The Fate of Supernova-Heated Gas in Star-Forming Regions of the LMC: Lessons for Galaxy Formation?
• New constraints on the nature and origin of the Leading Arm of the Magellanic Stream
• Sensitivity of the Cherenkov Telescope Array to TeV photon emission from the Large Magellanic Cloud
• Mapping the Supernovae Driven Winds of the Large Magellanic Cloud in H$\alpha$ Emission I
• A detection of H${}_2$ in a high velocity cloud toward the Large Magellanic Cloud
• Galaxies at a Cosmic-Ray Eddington Limit
• Braving the Storm: Quantifying Disk-wide Ionized Outflows in the Large Magellanic Cloud with ULLYSES
• The Diffuse Ionized Gas of the Large Magellanic Cloud