SIMBAD references

2021AJ....161...57G - Astron. J., 161, 57-57 (2021/February-0)

Total X-ray emission from the LMC observed with HaloSat.

GULICK H., KAARET P., ZAJCZYK A., LAROCCA D.M., BLUEM J., RINGUETTE R., JAHODA K. and KUNTZ K.D.

Abstract (from CDS):

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.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Large Magellanic Cloud - Magellanic Clouds - X-ray astronomy - X-ray surveys - Surveys - Interstellar thermal emission - Interstellar emissions - Dwarf irregular galaxies - Dwarf galaxies

Simbad objects: 15

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