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Fig. 19


Column density ratio O iv/O v vs. O iv/O vi based on the models of Gnat & Sternberg (2007). The black line corresponds to CIE, while the red lines indicate the isobaric non-equilibrium cooling models using solar metallicity (solid line) and 0.1× solar metallicity (dotted line). Corresponding log T(K) values are given by the labels along the curves. The curves are drawn as a thick line for the log T(K) values corresponding to the 1σ confidence range obtained from the RGS1 SPEX CIE fit to the O iv/O v line ratio data, extended with the systematic offset of 0.05 dex between the different CIE implementations in Gnat & Sternberg (2007) and SPEX. The blue star and box indicate the measurement.

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