XMM Users' Handbook

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RGS spectral quality

In Figs. 59-62 we display a series of RGS spectra of Mewe-Kaastra-Liedahl (in the following ``Mekal'') model plasmas with different energies, kT, ranging from 0.1 to 10.0 keV, with successively increasing total photon numbers (from 500 to 10000 counts). These show what RGS data quality can be expected for a given number of counts. All model spectra have been produced with SciSim, using a Mekal model spectrum from xspec.

**Figure 59:** *Series of RGS model spectra of a Mekal thermal plasma with a temperature of 0.1 keV. From the bottom to the top, the total number of counts increases from 500 to 10000.*
$\begin{figure} \begin{center} \leavevmode \epsfig{width=0.6\hsize, angle=270, file=figs/rfc_mekal_00_1kev.eps} \end{center} \end{figure}$

**Figure 60:** *Series of RGS model spectra of a Mekal thermal plasma with a temperature of 0.5 keV. From the bottom to the top, the total number of counts increases from 500 to 10000.*
$\begin{figure} \begin{center} \leavevmode \epsfig{width=0.6\hsize, angle=270, file=figs/rfc_mekal_00_5kev.eps} \end{center} \end{figure}$

**Figure 61:** *Series of RGS model spectra of a Mekal thermal plasma with a temperature of 2.0 keV. From the bottom to the top, the total number of counts increases from 500 to 10000.*
$\begin{figure} \begin{center} \leavevmode \epsfig{width=0.6\hsize, angle=270, file=figs/rfc_mekal_02_0kev.eps} \end{center} \end{figure}$

**Figure 62:** *Series of RGS model spectra of a Mekal thermal plasma with a temperature of 5 keV. From the bottom to the top, the total number of counts increases from 500 to 10000.*
$\begin{figure} \begin{center} \leavevmode \epsfig{width=0.6\hsize, angle=270, file=figs/rfc_mekal_05_0kev.eps} \end{center} \end{figure}$

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