Tremblay-en-France, France
Tremblay-en-France, France

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Pierre M.,CEA Saclay Nuclear Research Center | Adami C.,Laboratoire dAstrophysique Marseille France | Birkinshaw M.,University of Bristol | Chiappetti L.,Istituto di Astrofisica Spaziale e Fisica Cosmica | And 107 more authors.
Astronomische Nachrichten | Year: 2017

The XXL survey currently covers two 25deg2 patches with XMM observations of ∼10ks. We summarize the scientific results associated with the first release of the XXL dataset, which occurred in mid-2016. We review several arguments for increasing the survey depth to 40ks during the next decade of XMM operations. X-ray (z<2) cluster, (z<4) active galactic nuclei (AGN), and cosmic background survey science will then benefit from an extraordinary data reservoir. This, combined with deep multi-λ observations, will lead to solid standalone cosmological constraints and provide a wealth of information on the formation and evolution of AGN, clusters, and the X-ray background. In particular, it will offer a unique opportunity to pinpoint the z>1 cluster density. It will eventually constitute a reference study and an ideal calibration field for the upcoming eROSITA and Euclid missions. © 2017 John Wiley & Sons Australia, Ltd and Ruijin Hospital, Shanghai Jiaotong University School of Medicine.

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