BeppoSAX and ROSAT observations of the supernova remnant RCW86

Physics – Nuclear Physics

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Scientific paper

We present the first results of a BeppoSAX observation of RCW86, covering the south-west part of the remnant (the knee). The spatial analysis of the LECS and MECS data confirms that strong variations of the emission hardness exist between the inner and the outer part of the knee. ROSAT data suggest that these variations are not due to absorption effects. The Non Equilibrium of Ionization (NEI) spectral analysis of the LECS data shows that the emission is characterized by the presence of a temperature component at kT~2keV, which, if compared with recent ASCA results obtained with a similar analysis, is softer, more absorbed, and not heavily metal-depleted. The LECS data also do not exclude the presence of a second very soft component (VSC) with kT~0.4keV. The VSC, if real, is to be associated with interaction of main blast wave with interstellar medium (ISM) inhomogeneities. The NEI spectral analysis of the ROSAT PSPC data confirms the presence of the VSC, and yields an estimate of the interstellar absorption and ionization parameters, but it does not exclude also higher temperature components.

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