4.2 Iron Emission Lines

To fit the iron emission lines, we added four Gaussian components (zgauss ) at 6.4keV (FeK$ \alpha $), 6.67keV (FeHe$ \alpha $), 6.96keV (FeLy$ \alpha $), and 7.05keV (FeK$ \beta$) in the rest frame to the continuum model as follows: $ \textsf{tbnew}~\times \textsf{highecut}~
\times (\textsf{diskbb}~+ \textsf{zpowerlw}~+ \sum_{i=1}^{4} \textsf{zgauss}~(i))$.

As seen in Figure 3, the data are consistent with three Gaussian lines at energies between 6keV and 7keV, namely the K$ \alpha $ fluorescent iron line at 6.4keV, the He$ \alpha $ iron line at 6.67keV, and the Fe Ly$ \alpha $ iron line at 6.96 keV blended with K$ \beta$ fluorescent iron lines at 7.05. To measure the Ly$ \alpha $ line flux correctly, we set the K$ \beta$ line flux to the theoretical iron K$ \beta$/K$ \alpha $ flux ratio of 0.135 (e.g. see Palmeri et al., 2003), then estimated the Ly$ \alpha $ line in the presence of a possible K$ \beta$ contribution, whose absolute width and relative energy were also tied to the Fe K$ \alpha $. The lines that we associate with fluorescent iron and He-like iron emission are significantly detected with positive equivalent widths.

Ashkbiz Danehkar