XMM-Newton Users Handbook RGS Sensitivity Limits

The main point of the RGS sensitivity is the emission line detection threshold. To get an estimate of the exposure time necessary to detect a line above a certain underlying continuum (at a given significance level) detailed simulations should be performed. Then the line flux integrated over the HEW of the line profile should be evaluated. For such an estimate, four contributing components must be considered:

At the discussed energies the extragalactic X-ray background can be well reproduced by a power-law spectrum. This allows us to consider the X-ray background simply by adding an additional component to the continuum flux of the source.

Various components may feature in the data from RGS observations, such as:

European Space Agency - XMM-Newton Science Operations Centre