The ARCHES project
  ARCHES (Astronomical Resource Cross-matching for High Energy Studies) is a
FP7-Space funded project whose aim is to provide the international astronomical
community with well-characterised multi-wavelength data in the form of spectral
energy distributions (SEDs) for large samples of objects extracted from the
3XMM DR5 X-ray catalogue of serendipitous sources. The project has developed
new tools implementing fully probabilistic simultaneous cross-correlation of
several catalogues for unresolved sources and a multi-wavelength finder for
clusters of galaxies for extended sources. These enhanced resources have been
tested in the framework of several science cases.
