Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-06
Astronomy and Astrophysics
Astrophysics
18 pages, 3 figures (figure 2 is in color with 5 panels); submitted to the Astrophysical Journal; High resolution versions of
Scientific paper
An atlas of gas temperature maps is presented for a flux limited catalog of galaxy clusters. The sample of clusters is based on the Edge et al. (1990) sample, with the inclusion of five additional clusters, all with fluxes f_X(2-10 keV)>= 1.7x10**-11 ergs sec**-1 cm**-2, drawn from a variety of other sources. The temperature maps are derived from ASCA GIS observations using a common methodology to correct for the Point-Spread Function and calculate the local projected gas temperature in such a way so as to make each cluster directly comparable to all others in the sample. Variations in the temperature distribution, when present at > 90% confidence, are characterized by their severity and extent. We find that 70% of the clusters in our sample have significant variations in the projected gas temperature. The presence of these variations increases with increasing luminosity, as does the spatial scope and severity within a cluster. For a more limited sample we find that one third of clusters with temperature structure have radio halos. The high rate of occurance of structure emphasizes the need for caution when using clusters to measure cosmological parameters.
Churazov Eugene
Donnelly Hank R.
Forman William
Gilfanov Marat
Jones Christine
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