X-CLASS

XMM CLuster Archive Super Survey

The XMM CLuster Archive Super Survey is an X-ray galaxy cluster search in XMM-Newton archival data.

This webpage provides access to the X-CLASS catalogue through a dedicated database.


On your first visit you will be asked to choose a login and password which will grant you access to the catalogue. It is immediate and no other information is required !

Contact: Jean-Paul Le Fèvre (» e-mail)

Database overview

X-ray and optical images
Raw and spatially filtered X-ray images are given for each entry in the catalogue. An optical image (POSS-II) is also provided.

Nasa Extragalactic database cross-identification
For each cluster in the catalogue we provide the list of objects listed in the NED (» link) for which redshift information is available and within 3 arcmin of the X-ray centroid.

Detailed information about the X-ray data
Images of the XMM pointings and corresponding information about flare removal procedure are accessible for each catalogue entry. Count-rate measurements in several energy bands can also be retrieved for each cluster, along with corresponding plots.

Related publications :

Clerc et al., 2012, MNRAS, 423, 3561 abstract

Sadibekova et al., 2014, A&A, 571, 87 abstract