Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-02-20
MNRAS 386 (2008), 1464
Astronomy and Astrophysics
Astrophysics
Accepted for publication in MNRAS. 20 pages, 15 figures, LaTeX2e
Scientific paper
10.1111/j.1365-2966.2008.13128.x
We report on the analysis of a deep (100 ks) observation of the starburst galaxy M82 with the EPIC and RGS instruments on board the X-ray telescope XMM-Newton. The broad-band (0.5-10 keV) emission is due to at least three spectral components: i) continuum emission from point sources; ii) thermal plasma emission from hot gas; iii) charge exchange emission from neutral metals (Mg and Si). The plasma emission has a double-peaked differential emission measure, with the peaks at ~0.5 keV and ~7 keV. Spatially resolved spectroscopy has shown that the chemical absolute abundances are not uniformly distributed in the outflow, but are larger in the outskirts and smaller close to the galaxy centre. The abundance ratios also show spatial variations. The X-ray derived Oxygen abundance is lower than that measured in the atmospheres of red supergiant stars, leading to the hypothesis that a significant fraction of Oxygen ions have already cooled off and no longer emit at energies > ~0.5 keV.
Comastri Andrea
Maiolino Roberto
Origlia Livia
Ranalli Piero
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