Volume 547, November 2012
|Number of page(s)||11|
|Section||Interstellar and circumstellar matter|
|Published online||22 October 2012|
XMM-Newton view of the N 206 superbubble in the Large Magellanic Cloud
Institut für Astronomie und Astrophysik, Kepler Center for Astro and
Particle Physics, Eberhard Karls Universität,
2 Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile
Received: 3 May 2012
Accepted: 6 September 2012
Aims. We perform an analysis of the X-ray superbubble in the N 206 H ii region in the Large Magellanic Cloud using current generation facilities to gain a better understanding of the physical processes at work in the superbubble and to improve our knowledge of superbubble evolution.
Methods. We used XMM-Newton observations of the N 206 region to produce images and extract spectra of the superbubble diffuse emission. Morphological comparisons with Hα images from the Magellanic Cloud Emission Line Survey were performed, and spectral analysis of the diffuse X-ray emission was carried out. We derived the physical properties of the hot gas in the superbubble based on the results of the spectral analysis. We also determined the total energy stored in the superbubble and compared this to the expected energy input from the stellar population to assess the superbubble growth rate discrepancy for N 206.
Results. We find that the brightest region of diffuse X-ray emission is confined by a Hα shell, consistent with the superbubble model. In addition, faint emission extending beyond the Hα shell was found, which we attribute to a blowout region. The spectral analysis of both emission regions points to a hot shocked gas as the likely origin of the emission. We determine the total energy stored in the bubble and the expected energy input by the stellar population. However, due to limited data on the stellar population, the input energy is poorly constrained and, consequently, no definitive indication of a growth rate discrepancy is seen.
Conclusions. Using the high-sensitivity X-ray data from XMM-Newton and optical data from the Magellanic Cloud Emission Line Survey has allowed us to better understand the physical properties of the N 206 superbubble and address some key questions of superbubble evolution.
Key words: Magellanic Clouds / ISM: bubbles / evolution / HII regions / X-rays: ISM
© ESO, 2012
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