The XXL survey will map two extragalactic regions of 25 deg2, using 10 ks XMM observations to yield a point-source sensitivity of ~ 5 10-15 erg/s/cm2 in the [0.5-2] keV band.
It is the largest XMM project approved to date (3Ms in December 2010, >6Ms in total).
Some 600 new galaxy clusters are expected out to z~1.5-2 as well as more than 10,000 AGNs out to z~4.
The main goal of the project is to constrain the Dark Energy equation of state using clusters of galaxies. This survey will have lasting legacy value for cluster scaling laws and studies of AGNs and XRB.
This project builds on the experience acquired during the ten years XMM-LSS pilot survey. It is open to any scientist belonging to the international astronomical community, and interested in actively contributing to the general legacy effort.
The two surveyed regions are:
Observations start by mid 2011 and will be completed by mid 2013
(Download a synthetic overview of the XXL project xxl-overview.pdf)
Maj : 07/03/2014 (3033)