2021AJ....161...57G

We constrain the global parameters of the Large Magellanic Cloud (LMC) by modeling the first soft X-ray (0.4-6.8 keV) observations of the entire LMC produced in a single pointing with moderate spectral resolution by the HaloSat CubeSat. These data are best fit with the sum of two thermal plasma components in collisional ionization equilibrium and a power law. We find cool (0.210 ± 0.014 keV) and hot (0.89 ± 0.14 keV) components. The total X-ray luminosity of the LMC is (1.08 ± 0.14) x 10³⁹ erg s^–1. X-ray binaries make up a large fraction of the emission with a luminosity of (6.0 ± 0.8) x 10³⁸ erg s^–1, followed by cool gas from superbubbles, supernovae, and diffuse emission with a luminosity of (3.0 ± 0.3) x 10³⁸ erg s^–1. The hot gas from star formation contributes the smallest fraction, with a luminosity of (1.9 ± 0.5) x 10³⁸ erg s^–1. We estimate the total volume of the cool gas to be between (0.2-1.2) x 10¹⁰ pc³ and the hot gas to be between (1.0-5) x 10⁷ pc³ for filling factors of f = 1 and 0.2. These volumes result in a total thermal energy for the cool gas between (1.4-3) x 10⁵⁴ erg for electron densities of 0.017-0.04 cm^–3, and a thermal energy for the hot gas between (1.7-4) x 10⁵³ erg for electron densities of 0.12-0.3 cm^–3. This yields cooling timescales for the cool and hot gas of (1.5-3) x 10⁸ yr and (1.8-6) x 10⁷ yr, respectively.