Abundance drops in the centres of clusters of galaxies

Details Abundance drops in the centres of clusters of galaxies Abundance drops in the centres of clusters of galaxies

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004head....8.0105s&link_type=abstract

American Astronomical Society, HEAD meeting #8, #01.05; Bulletin of the American Astronomical Society, Vol. 36, p.902

Astronomy and Astrophysics

Astronomy

Scientific paper

X-ray observations of clusters of galaxies often show a central abundance peak. However recent observations of clusters by Chandra and XMM show several clusters where the abundance drops again in the very innermost region, leading to an off-centre peak (e.g. Centaurus, Abell 2199). A possible explanation for these drops is that the cores of these objects are optically thick in certain resonance emission lines. We present results obtained using a detailed new spectral model which takes account of the effect of scattering on several thousand resonance lines, and discuss whether resonance scattering is a likely explanation for the observed abundance drops.

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