Other
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe..93e&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
M33 contains many emission nebulae identified as supernova remnants(SNRs) based on the high [S II]:H alpha ratios characteristic of shocked gas. Using Chandra data from the ChASeM33 survey with a 0.35-2 keV sensitivity of about 2× 10^{34} ergs s^{-1}, we have detected more than 70 of these nebulae, yielding confirmation of their SNR identifications, and providing the largest homogeneous sample of remnants detected at optical, radio, and X-ray wavelengths in any galaxy, including the Milky Way. A spectral analysis of the six X-ray brightest SNRs reveals that two, G98-31 and G98-35, have spectra that appear to be dominated by ejecta from a core-collapse explosion. In general, the X-ray detected SNRs have soft X-ray spectra compared to the vast majority of sources detected along the line of sight to M33. We found no new extended X-ray sources likely to be SNRs. It is unlikely that there remain to be discovered any other thermally dominated X-ray SNR with luminosities of above 4× 10^{35} ergs s^{-1} in the portions of M33 covered by the ChASeM33 survey. There are no close analogues of Cas A or the Crab Nebula in M33, but we have found an X-ray source with a power law spectrum coincident with a small-diameter radio source that may be the first pulsar-wind nebula recognized in the galaxy. This work was supported by NASA grant NAS G06-7073A and NASA contract NAS8-03060.
Blair William Patrick
ChASeM33 Team
Edgar Richard
Long Knox S.
Winkler Frank
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