AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 85. Supernova Remnants and Planetary Nebulae
Display, Thursday, June 3, 1999, 9:20am-4:00pm, Southwest Exhibit Hall

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[85.07] A New Ejecta-Dominated Galactic Supernova Remnant

C.E. Rakowski, J.P. Hughes (Rutgers University), P. Slane, P. Plucinsky (CfA)

We have been conducting an X-ray survey of cataloged radio supernova remnants (SNRs) in the Galaxy that have recently been found to be X-ray sources based on ROSAT survey and pointed-mode observations. Here we present the analysis and interpretation of ASCA GIS and SIS data from one of the brightest of these: SNR G337.2-0.7. Image analysis reveals, in addition to the SNR, a soft unresolved source which we tentatively identify with a catalogued F star (mV = 7.5). G337.2-0.7 itself, which is roughly 6\prime in diameter, does not exhibit any change in morphology as a function of X-ray energy. In particular, there is no hardening of the emission towards the central region, which appears to rule out the presence of a bright pulsar-powered synchrotron nebula in this remnant. The most remarkable feature of the X-ray emission from G337.2-0.7 is its line-rich thermal spectrum, which we analyze using nonequilibrium ionization (NEI) spectral models. Our results require abundances that are far from the solar ratios with silicon and sulfur being highly over-abundant relative to neon, magnesium, and iron. We argue that G337.2-0.7 is a new example of a young ejecta-dominated Galactic supernova remnant.

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