The Global Content, Distribution, and Kinematics of Interstellar O VI in the Large Magellanic Cloud

Abstract

We present FUSE observations of interstellar O VI absorption towards 12 early-type stars in the Large Magellanic Cloud (LMC). O VI 1031.926 Ang absorption at LMC velocities is seen towards all 12 stars. The observed columns are in the range log N(O VI)=13.9 to 14.6, with a mean of 14.37. The observations probe several sight lines projected onto known superbubbles, but these show relatively little (if any) enhancement in O VI column density compared to sight lines towards relatively quiescent regions of the LMC. The observed LMC O VI absorption is broad, with Gaussian dispersions of 30 to 50 km/sec, implying temperatures T<(2-5)x10^6 K. The O VI absorption is typically displaced -30 km/sec from the corresponding low-ionization absorption associated with the bulk of the LMC gas. The properties of the LMC O VI absorption are very similar to those of the Milky Way halo. The average column density of O VI and the dispersion of the individual measurements about the mean are identical to those measured for the halo of the Milky Way, even though the metallicity of the LMC is a factor of ~2.5 lower than the Milky Way. Much of the LMC O VI may arise in a vertically-extended distribution similar to the Galactic halo. If the observed O VI absorption is tracing a radiatively cooling galactic fountain flow, the mass flow rate from one side of the LMC disk is of the order 1 Msun/yr, with a mass flux per unit area of the disk ~0.02 Msun/yr/kpc^2. (abridged)

Accepted for publiction in the ApJ. 39 pages, including 9 figures and 6 tables. Version with full resolution figures available at http://fuse.pha.jhu.edu/~howk/Papers/

References in corpus (6)

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• An Atlas of FUSE Sight Lines Toward the Magellanic Clouds
• Large Scale Diffuse X-ray Emission from the Large Magellanic Cloud
• The ISM Interactions of a Runaway LBV Nebula in the LMC
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• The Far Ultraviolet Spectroscopic Explorer Survey of OVI Absorption in the Disk of the Milky Way
• On the Physical Origin of OVI Absorption-Line Systems
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• Properties of O VI Absorption in the Local Interstellar Medium
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• Hot Halos around High Redshift Protogalaxies: Observations of O VI and N V Absorption in Damped Lyman Alpha systems
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• Highly ionised plasma in the Large Magellanic Cloud: Evidence for outflows and a possible galactic wind
• Highly-Ionized Gas in the Galactic Halo: A FUSE Survey of O VI Absorption toward 22 Halo Stars
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• Mapping the Supernovae Driven Winds of the Large Magellanic Cloud in H$\alpha$ Emission I
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• Braving the Storm: Quantifying Disk-wide Ionized Outflows in the Large Magellanic Cloud with ULLYSES
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• Solar-Metallicity Gas in the Extended Halo of a Galaxy at $z\sim 0.12$
• The distribution and kinematics of interstellar O~{\small VI} in the Milky Way}
• O~{\small VI} absorption in the Milky Way along the Large Magellanic Cloud lines of sight