Thermal X-ray emission in the western half of the LMC superbubble 30 Dor C - INSPIRE

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Thermal X-ray emission in the western half of the LMC superbubble 30 Dor C

Apr 6, 2024

15 pages

Published in:

Mon.Not.Roy.Astron.Soc. 530 (2024) 4, 4219-4233

Published: May 6, 2024

e-Print:

2404.04778 [astro-ph.HE]

DOI:

10.1093/mnras/stae968

View in:

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Abstract: (Oxford University Press)

While 30 Dor C is a unique superbubble in the Large Magellanic Cloud for its luminous non-thermal X-ray emission, the thermal X-ray emission it emanates has not yet been thoroughly investigated and well constrained. Based on the separate ∼1 Ms deep XMM–Newton and Chandra observations, we report the discovery of the thermally emitting plasma in some portions of the western half of 30 Dor C. The thermal emission can be reproduced by a collisional-ionization-equilibrium plasma model with an average electron temperature of ∼0.4 keV. We find a significant overabundance of the intermediate-mass elements such as O, Ne, Mg, and Si, which may be indicative of a recent supernova explosion in 30 Dor C. Dynamical properties in combination with the information of the OB association LH 90 suggest that the internal post-main-sequence stars dominate the power of the superbubble and blow it out in the past ∼1 Myr.

Note:

15 pages, 18 figures. Accepted by MNRAS

ISM: bubbles
ISM: supernova remnants
stars: Wolf–Rayet

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