The XXL Survey. II. The bright cluster sample: catalogue and luminosity function

Understand

Context.

• The XXL Survey is the largest survey carried out by the XMM-Newton satellite and covers a total area of 50 square degrees distributed over two fields.
• It primarily aims at investigating the large-scale structures of the Universe using the distribution of galaxy clusters and active galactic nuclei as tracers of the matter distribution.
• Aims.