Suzaku Detection of Nonthermal X-ray Emission in the LMC Superbubble N11

Details Suzaku Detection of Nonthermal X-ray Emission in the LMC Superbubble N11 Suzaku Detection of Nonthermal X-ray Emission in the LMC Superbubble N11

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21115301m&link_type=abstract

American Astronomical Society, AAS Meeting #211, #153.01; Bulletin of the American Astronomical Society, Vol. 39, p.1004

Astronomy and Astrophysics

Astronomy

Scientific paper

Superbubbles are formed through the combined action of stellar winds and supernova explosions of massive stars in OB associations. These swept-up interstellar shells filled with rarefied hot gas can reach diameters of 100 pc, with interior temperatures of 10^{6}-10^{8} K. The low density of a superbubble interior often masks the optical and radio signatures of supernova remnants (SNRs). The presence of supernovae and SNR shocks is best diagnosed in the X-ray wavebands. The improved sensitivity of Suzaku to hard X-rays (E > 2 keV) allows us to study the energetic interactions between SNRs and the hot gas interior to superbubbles.
We have obtained Suzaku observations of the superbubble N11 in the Large Magellanic Cloud, and detected a clear nonthermal component in addition to the thermal component in the X-ray spectrum. This is the third such detection of nonthermal X-ray emission in superbubbles, the previous two being 30 Dor C and N51D. The mechanism for the nonthermal emission is likely the high-energy interaction of supernova shock with the hot gas in the superbubble. Using the X-ray spectral fits, we will determine some of the physical properties of the diffuse gas, refining estimates obtained from earlier thermal models.
This work is supported in part by Suzaku grant NNX07AF61G and NASA-LTSA grant NNG05GC97G

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