Astronomy and Astrophysics – Astronomy
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.8507r&link_type=abstract
American Astronomical Society, 194th AAS Meeting, #85.07; Bulletin of the American Astronomical Society, Vol. 31, p.973
Astronomy and Astrophysics
Astronomy
Scientific paper
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 (m_V = 7.5). G337.2-0.7 itself, which is roughly 6(') 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.
Hughes John Patrick
Plucinsky Paul P.
Rakowski Cara E.
Slane Pat
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