2009/01/21 by F. Bocchino, M. Miceli, E. Troja
Physics and Astronomy · #Abundance (ecology) #Astrophysical Phenomena and Observations #Astrophysics and Cosmic Phenomena #Metal #Radiative cooling #Radiative transfer #Solar and Space Plasma Dynamics #Spectral line #Supernova #astro-ph.GA
paper · pdf · doi:10.1051/0004-6361/200810742
A&A in press. For journal style pdf file, http://www.astropa.unipa.it/Library/OAPA_preprints/fb10742.pdf
arxiv created 2009/01/21 · openalex publication_date 2009/02/18 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
<i>Context. <i/>Recent developments in the study of mixed morphology supernova remnants (MMSNRs) have revealed the presence of metal-rich X-ray emitting plasma inside a fraction of these remnants, a feature not properly addressed by traditional models for these objects.<i>Aims. <i/>Radial profiles of thermodynamical and chemical parameters are needed for a fruitful comparison of data and model of MMSNRs, but these are available only in a few cases.<i>Methods. <i/>We analyzed XMM-Newton data of two MMSNRs, namely IC 443 and G166.0+4.3, previously known to have solar metal abundances, and performed a spatially resolved spectral analysis of the X-ray emission.<i>Results. <i/> We detected enhanced abundances of Ne, Mg and Si in the hard X-ray bright peak in the north of IC 443, and of sulphur in the outer regions of G166.0+4.3. The metal abundances are not distributed uniformly in both remnants. The evaporating clouds model and the radiative SNR model fail to reproduce consistently all the observational results.<i>Conclusions. <i/>We suggest that further deep X-ray observations of MMSNRs may reveal more metal-rich objects. More detailed models including ISM-ejecta mixing are needed to explain the nature of this growing subclass of MMSNRs.