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Creators/Authors contains: "McLeod, Anna_F"

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  1. Abstract The Large Magellanic Cloud (LMC) is home to many Hiiregions, which may lead to significant outflows. We examine the LMC’s multiphase gas (T∼104-5K) in Hi, Sii, Siiv, and Civusing 110 stellar sight lines from the Hubble Space Telescope’s Ultraviolet Legacy Library of Young Stars as Essential Standards program. We develop a continuum fitting algorithm based on the concept of Gaussian process regression and identify reliable LMC interstellar absorption overvhelio= 175–375 km s−1. Our analyses show disk-wide ionized outflows in Siivand Civacross the LMC with bulk velocities of ∣vout, bulk∣ ∼ 20–60 km s−1, which indicates that most of the outflowing mass is gravitationally bound. The outflows’ column densities correlate with the LMC’s star formation rate surface densities (ΣSFR), and the outflows with higher ΣSFRtend to be more ionized. Considering outflows from both sides of the LMC as traced by Civ, we conservatively estimate a total outflow rate of M ̇ out 0.03 M yr 1 and a mass-loading factor ofη≳ 0.15. We compare the LMC’s outflows with those detected in starburst galaxies and simulation predictions, and find a universal scaling relation of v out , bulk Σ SFR 0.23 over a wide range of star-forming conditions (ΣSFR∼ 10−4.5–102Myr−1kpc−2). Lastly, we find that the outflows are corotating with the LMC’s young stellar disk and the velocity field does not seem to be significantly impacted by external forces; we thus speculate on the existence of a bow shock leading the LMC, which may have shielded the outflows from ram pressure as the LMC orbits the Milky Way. 
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