We analyse a long archival XMM-Newton observation of the narrow-line Seyfert 1 galaxy Ton S180 , using the latest reflection models to explore the high quality X-ray spectrum .
We find that the iron line is relatively narrow and sharp , and the soft excess is extremely smooth .
We can not find an acceptable reflection model that describes both components , and conclude that the soft excess can not be produced by relativistic reflection .
Fitting the 3–10 keV band with relativistic reflection to model the iron line strongly prefers low spin values ( < 0.4 ) , with the exact value depending on the model and not well constrained .
We then model the broad-band spectrum with a two-component Comptonization continuum plus relativistic reflection .
This gives a much better fit than a pure reflection model , which again prefers a low spin value .
The photon index of the reflection component is intermediate between the two Comptonization components , suggesting that both illuminate the disk a similar amount and therefore both contribute to the reflection .