[82.05] Study of the supernova remnant G18.95-1.1

AAS 197, January 2001
Session 82. Supernova Remnants: Multispectral Observations
Display, Wednesday, January 10, 2001, 9:30am-7:00pm, Exhibit Hall

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[82.05] Study of the supernova remnant G18.95-1.1

I. M Harrus (NASA/GSFC), P. O Slane (SAO)

We present an analysis of data from the Advanced Satellite for Cosmology and Astrophysics (ASCA) of the supernova remnant (SNR) G18.95-1.1.

We find that G18.95-1.1 can be classified as ``thermal composite'', characterized by a thermal X-ray spectrum coupled with a centrally-bright morphology. The SNR total spectrum can be best described by a non-equilibrium ionization model with a temperature around 0.90 keV, and an ionization timescale around 10¹⁰ cm^-3 s^-1, associated with a column density around 10²² atoms cm^-2.

We've searched elemental abundance variation within the remnant and found marginal evidence for an over-abundance of magnesium and a depletion of sulfur. These findings are discussed in the context of SNR evolution. We find no evidence of high-energy emission.

If possible, we will also present some preliminary XMM-Newton results on other SNR observations.

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