Nitrogen abundance in the X-ray halos of clusters and groups of galaxies

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Fig. 6.

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Colour map of reduced chi-squared (χ²/d.o.f. in log₁₀ scale, upper panel) and SNIa fraction (, lower panel) for 10 × 16 combinations of yields we considered to fit the abundance ratios in NGC 5044, without N/Fe (d.o.f. = 7). The X-axis labels indicate the SNIa models. The Y-axis labels indicate IMF power-law index and the initial metallicity of the stellar populations.

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