2001ApJ...548..258R -
Astrophys. J., 548, 258-268 (2001/February-2)
Two new ejecta-dominated galactic supernova remnants: G337.2-0.7 and G309.2-0.6.
RAKOWSKI C.E., HUGHES J.P. and SLANE P.
Abstract (from CDS):
We present the analysis of new X-ray observations of two Galactic radio supernova remnants (SNRs), G337.2-0.7 and G309.2-0.6. Both remnants exhibit line-rich thermal spectra that require highly nonsolar elemental abundance ratios. In each case, Si and S are unequivocally overabundant compared to solar, based purely on the measured equivalent width of the Kα line complex. Detailed nonequilibrium ionization spectral analysis of these remnants, using a single-temperature, single ionization age model, confirms the overabundances, yielding Si, S, and Ar abundances many times their solar values: 3-5 times solar for G337.2-0.7 and greater than 3-10 times solar for G309.2-0.6. We also find that for both remnants, Ne and Mg are underabundant relative to Si, and for G309.2-0.6, Ca and Fe are relatively underabundant as well. This is the first detection of metal-rich, nonsolar abundance material in these remnants, identifying them as young ejecta-dominated SNRs. Further support for their youth comes from the distances that we estimate from the fitted column densities (less than 15 kpc for G337.2-0.7, and 4±2 kpc for G309.2-0.6). From the implied sizes of the remnants at these distances we infer relatively young ages (2000-4500 years for G337.2-0.7 and 700-4000 years for G309.2-0.6). Finally, we note that no compact object has yet been found within G337.2-0.7, but an X-ray point source is evident within the radio shell of G309.2-0.6, although its nature remains unknown.
Abstract Copyright:
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Journal keyword(s):
ISM: Abundances - ISM: Supernova Remnants - X-Rays: General
Simbad objects:
18
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