Other
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe.102g&link_type=abstract
Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo
Other
Galaxies
Scientific paper
We present results from the first detailed analysis of the diffuse X-ray emission in NGC604 and IC131. These regions are the only X-ray bright giant HII regions in M33 and were observed as part of ChASeM33. The main bubbles in NGC604 are filled with a hot thermal plasma of kT=0.5keV. The X-ray gas mass and unabsorbed X-ray luminosity in the western part of NGC604 are consistent with stellar mass-loss from 200 OB-stars and agree well with predictions from the standard bubble model. In the eastern part of NGC604 mass loss from young stars alone cannot account for the X-ray luminosity and another mechanism, such as off-center SNRs, is required to produce the additional luminosity. The X-ray spectrum of the extended emission in IC131 can be equally well fitted by an absorbed powerlaw (Γ=2.2) or an absorbed thermal plasma model (kT=4.3keV). Both models predict that more than 40% of the luminosity is emitted above 2keV. Compared to other HII regions, IC131 is extreme regarding its large extent of the X-ray emission (˜200pc), the lack of O stars, its high electron temperature (assuming thermal emission), and large fraction of hard X-rays. A thermal plasma of 4keV poses serious challenges to theoretical models, as it is unclear how such high electron temperatures can be obtained. In case the gas is non-thermal, it remains to be understood if the same mechanisms which create non-thermal X-rays or accelerate CRs in SNRs are applicable to these much larger scales. In both cases appropriate theoretical models are needed. Clearly, NGC604 and IC131 seem to be in completely different evolutionary stages. All O-type stars in IC131 seemed to have turned into SNe, whereas the western part of NGC604 awaits its first SNe to occur. Support for this work was provided by NASA through Chandra Award Number G06-7073A.
Blair William Patrick
Gaetz Terrance
Gaetz Terrance J.
Haberl Franck
Kuntz Kip D.
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