| The diagram shows recent determinations of Ωm0 and ΩΛ0. Explain how the X-ray emission from rich clusters of galaxies is used to determine Ωm0. Further explain how it can be used to determine the ratio of baryonic to non-baryonic matter in the cluster. | [5] |
| This is a significant essay question – 5 marks is 10–15 minutes' work, so one paragraph is unlikely to be adequate. Make sure you put in all the detail you can think of, while remaining focused on the question (just telling me everything you know about clusters of galaxies will be counterproductive). The two main faults in essay questions like this are not writing enough, and not sticking to the point. |
(2008 Q8(b).)