Mapping the Supernovae Driven Winds of the Large Magellanic Cloud in H$\alpha$ Emission I

Abstract

We present the first spectroscopically resolved \ha\ emission map of the Large Magellanic Cloud's (LMC) galactic wind. By combining new Wisconsin H-alpha Mapper (WHAM) observations ($I_{\mathrm{H}\alpha }\gtrsim 10\mathrm{mR}$) with existing \hicm\ emission observations, we have (1) mapped the LMC's near-side galactic wind over a local standard of rest (LSR) velocity range of $+50\le {\mathrm{v}}_{\mathrm{LSR}}\le +250\mathrm{km}{\mathrm{s}}^{-1}$, (2) determined its morphology and extent, and (3) estimated its mass, outflow rate, and mass-loading factor. We observe \ha\ emission from this wind to typically 1-degree off the LMC's \hi\ disk. Kinematically, we find that the diffuse gas in the warm-ionized phase of this wind persists at both low ($\lesssim 100\mathrm{km}{\mathrm{s}}^{-1}$) and high ($\gtrsim 100\mathrm{km}{\mathrm{s}}^{-1}$) velocities, relative to the LMC's \hi\ disk. Furthermore, we find that the high-velocity component spatially aligns with the most intense star-forming region, 30~Doradus. We, therefore, conclude that this high-velocity material traces an active outflow. We estimate the mass of the warm ($T_e\approx 10^4\mathrm{K}$) ionized phase of the near-side LMC outflow to be $\log \left(M_{\mathrm{ionized}}/M_{\odot }\right)=7.51\pm 0.15$ for the combined low and high velocity components. Assuming an ionization fraction of 75\% and that the wind is symmetrical about the LMC disk, we estimate that its total (neutral and ionized) mass is $\log \left(M_{\mathrm{total}}/M_{\odot }\right)=7.93$, its mass-flow rate is ${\dot{M}}_{\mathrm{outflow}}\approx 1.43M_{\odot }\mathrm{y}{\mathrm{r}}^{-1}$, and its mass-loading factor is $\eta \approx 4.54$. Our average mass-loading factor results are roughly a factor of 2.5 larger than previous \ha\ imaging and UV~absorption line studies, suggesting that those studies are missing nearly half the gas in the outflows.

arXiv comment19 pages, 9 figures

References in corpus (49)

• The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
• Galactic Winds
• A Quantitative Comparison of SMC, LMC, and Milky Way UV to NIR Extinction Curves
• Absorption-Line Probes of Gas and Dust in Galactic Superwinds
• The Large, Oxygen-Rich Halos of Star-Forming Galaxies Are A Major Reservoir of Galactic Metals
• The Star Formation History of the Large Magellanic Cloud
• The Wisconsin H-Alpha Mapper Northern Sky Survey
• GASS: The Parkes Galactic All-Sky Survey. I. Survey Description, Goals, and Initial Data Release
• The Role of Dwarf Galaxy Interactions in Shaping the Magellanic System and Implications for Magellanic Irregulars
• A Budget and Accounting of Metals at z~0: Results from the COS-Halos Survey
• The Origin of the Magellanic Stream and Its Leading Arm
• Third-Epoch Magellanic Cloud Proper Motions II: The Large Magellanic Cloud Rotation Field in Three Dimensions
• Simulations of the Magellanic Stream in a First Infall Scenario
• A New Look at the Large-Scale HI Structure of the LMC
• Clustering of Local Group distances: publication bias or correlated measurements? I. The Large Magellanic Cloud
• Very Extended X-ray and H-alpha Emission in M82: Implications for the Superwind Phenomenon
• The Optical Depth of H II Regions in the Magellanic Clouds
• H_alpha Emission from High-Velocity Clouds and their Distances
• The Magellanic Stream: Circumnavigating the Galaxy
• Tracing Inflows and Outflows with Absorption Lines in Circumgalactic Gas
• The gravitational and hydrodynamical interaction between the LMC and the Galaxy
• The Mass and Momentum Outflow Rates of Photoionized Galactic Outflows
• Ram Pressure Stripping of the Large Magellanic Cloud's Disk as a Probe of the Milky Way's Circumgalactic Medium
• A Keck/HIRES Study of Kinematics of the Cold Interstellar Medium in Dwarf Starburst Galaxies
• SMASHing the LMC: A Tidally-induced Warp in the Outer LMC and a Large-scale Reddening Map
• Trident: a universal tool for generating synthetic absorption spectra from astrophysical simulations
• The COS/UVES Absorption Survey of the Magellanic Stream: II. Evidence for a complex enrichment history of the Stream from the Fairall 9 sightline
• The COS/UVES Absorption Survey of the Magellanic Stream: I. One-Tenth Solar Abundances along the Body of the Stream
• Feedback in low-mass galaxies in the early Universe
• The Origin and Kinematics of Cold Gas in Galactic Winds: Insight from Numerical Simulations
• Highly ionised plasma in the Large Magellanic Cloud: Evidence for outflows and a possible galactic wind
• The Global Content, Distribution, and Kinematics of Interstellar O VI in the Large Magellanic Cloud
• Ionized Gas in the Smith Cloud
• The Distances of the Magellanic Clouds
• Properties and Origin of the High-Velocity Gas Toward the Large Magellanic Cloud
• Warm Ionized Gas Revealed in the Magellanic Bridge Tidal Remnant: Constraining the Baryon Content and the Escaping Ionizing Photons around Dwarf Galaxies
• Emission-line stars discovered in the UKST H-alpha survey of the Large Magellanic Cloud; Part 1: Hot stars
• Cosmic Ray Driven Outflows from the Large Magellanic Cloud: Contributions to the LMC Filament
• A Map of the Ionized Component of the Intermediate Velocity Cloud Complex K
• Evolution of the Stellar Mass-Metallicity Relation. II. Constraints on Galactic Outflows from the Mg Abundances of Quiescent Galaxies
• Interstellar H-Alpha Line Profiles toward HD 93521 and the Lockman Window
• Revealing the Ionization Properties of the Magellanic Stream using Optical Emission
• 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
• Present-day Galactic Evolution: Low-metallicity, Warm, Ionized Gas Inflow Associated with High-Velocity Cloud Complex A
• High-velocity gas towards the LMC resides in the Milky Way halo
• The Diffuse Ionized Gas Halo of the Small Magellanic Cloud
• Survey of O VI absorption in the Large Magellanic Cloud
• H$\alpha$ Distances to the Leading Arm of the Magellanic Stream
• Large and small-scale structure of the Intermediate and High Velocity Clouds towards the LMC and SMC

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• Scanning Fabry--Perot Interferometer of the 6-m SAO RAS Telescope
• X-ray spectroscopy of the starburst feedback in 30 Doradus
• A detection of H${}_2$ in a high velocity cloud toward the Large Magellanic Cloud
• The Diffuse Ionized Gas of the Large Magellanic Cloud
• Braving the Storm: Quantifying Disk-wide Ionized Outflows in the Large Magellanic Cloud with ULLYSES