Programme d’observation extragalactique de la mission spatiale XMM Newton. 

Extragalactic observation program of the space mission XMM Newton.



Tableau de de Vassily Kandinsky qui apparait comme un visionnaire:
- le cercle represente le champ de vue d'XMM
- le grand X, represente "rayons X" et symbolise les digrammes cosmologiques
- les cercles de differentes couleurs: les amas de galaxies vus en rayons X avec des temperatures differentes
- les petits points: les noyaux actifs de galaxies vus en rayons X
- les grands traits noirs fins: les grandes structure de l'univers 



Last update : 11/24 2016 (3015)



The XXL survey has mapped two extragalactic regions of 25 deg2, using 10 ks XMM observations down to 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).

As of December 2015, some 450 new galaxy clusters are detected out to z~1.5-2 as well as more than 22,000 active galactic nuclei (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 also have lasting legacy value for cluster scaling laws and studies of AGNs and X-ray background.

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:


  •     CFHTLS W1 centre:       2h23min    -4deg30' (J2000),  25 deg2

  •     BCS centre:                  23h30min  -55deg00' (J2000),  25 deg2

 Observations were completed in 2013

The XXL exposure ans sensitivity maps are available here

(Download a synthetic overview of the XXL project xxl-overview.pdf)




Last update : 01/08 2016 (3032)




M. Pierre (CEA Saclay, principal investigator)

M. Birkinshaw (Univ. Bristol)
A. Evrard (Univ. Michigan)
C. Horellou (Obs.Onsala)
A. Iovino (INAF-OAB, Brera)
C. Lidman (AAO, Epping)
S. Maurogordato (Obs. Nice)
S. Paltani (Univ. Geneva)
M. Plionis (Univ. Thessaloniki)

V. Smolcic (Univ. Zagreb)
J. Surdej (Univ. Liege)
C. Vignali (Univ. Bologna)
J. Willis (Univ. Victoria)?










Last update : 04/05 2016 (3017)


The work is organised in working groups, with the following coodinators





X-ray processing : F. Pacaud

X-ray background : S. Snowden

General catalogue : L. Chiappetti, S. Maurogordato

Catalogue information : A. Elyiv, O. Melnyk, E. Pompei

Photometric redshifts : S. Paltani

Spectroscopic follow-up : C. Lidman, S. Murray, J. Willis

Redshift archival : C. Adami, L. Guennou

Radio follow-up : V. Smolcic,  M. Birkinshaw, H. Rottgering




Theory and simulations : A. Evrard


Clusters of galaxies (general) : M. Pierre

Cosmology : F. Pacaud, D.Rappetti

Mass measurements : G. Smith, F. Menanteau

z>>1 clusters: M. Bremer, J. Santos

The z~0.3-0.5 groups: B. Poggianti, F. Gastaldello


AGNs (general) : M. Plionis

Environmental studies : S. Raychaudhury, O. Melnyk

Large scale structure : N. Cappelluti, A. Elyiv

Evolution : I. Georgantopoulos, R. Hickox

Miscellaneous : A. Comastri

Cosmology: S. Basilakos, A. Goobar





Birmigham group (I. McCarthy et al)

Michigan group (A. Evrard et al)

Oxford group (J. Devriendt et al)

Princeton group (D. Spergel et al)

Meudon group (P.S. Corasaniti et al)



Last update : 04/30 2014 (3169)


Last update : 04/30 2014 (3018)


Last update : 04/30 2014 (3019)


Refereed publications


   First series of XXL papers, December 2015

    Previous papers

Conference presentations


(with on-line presentation links if available)

  • Lieu et al., 2014: XXL Bright Sample: Weak Lensing MT scaling relation of groups and clusters, Madrid, November, 4-7 2014

XXL related PhDs


Publication list of the XMM-LSS project



Last update : 10/11 2016 (3020)


Last update : 04/30 2014 (3022)


C. Adami (Laboratoire d'Astrophysique, Marseille, FR)


S. Alis (Faculty of Science, Istanbul University, TR)


B. Altieri (European Space Astronomy Center, Madrid, ES)


N. Baran (University of Zagreb, HR)


C. Benoist (Observatoire de la Cote d'Azur, Nice, FR)


M. Birkishaw (University of Bristol, UK)


A. Bongiorno (Rome Observatory, Italy)


M. Bremer (University of Bristol, UK)


A. Butler (University of Western Austalia, AU)


A. Cappi (INAF-OABO, Bologna, IT)


C. Caretta (Laboratoire d'Astrophysique, Marseille, FR)


L. Chiappetti (INAF-IASF, Milano, IT)


P. Ciliegi (INAF-OABO, Bologna, IT)


N. Clerc (MPE, Garching, DE)


P. S. Corasaniti (Observatoire de Paris, FR)


J. Coupon (ISCD, Geneva Observatory, CH)


J. Delhaize (University of Zagreb, HR)


I. Delvecchio (University of Zagreb, HR)


J. Democles (Service d'Astrophysique CEA, Saclay, FR)


Sh. Desai (University of Illinois, US)


J. Devriendt  (University of Oxford, UK)


Y. Dubois  (University of Oxford, UK)


D. Eckert (ISCD, Geneva Observatory, CH)


A. Elyiv  (University of Liege, BE)


S. Ettori (INAF-OABO, Bologna, IT)


A. E. Evrard  (University of Michigan, Ann Arbor, US)


L. Faccioli (Service d'Astrophysique CEA, Saclay, FR)


A. Farahi (University of Michigan, Ann Arbor, US)


C. Ferrari (Observatoire de la Cote d'Azur, FR)


S. Fotopoulou (ISCD, Geneva Observatory, CH)


W. Forman (H. S. Center for Astrophysics, Cambridge, US)


F. Gastadello (INAF-IASF, Milan, IT)


I. Georgantopoulos (Observatory of Athens, GR)


P. Giles (University of Bristol, UK)


V. Guglielmo (Observatory of Padova, IT)


C. Horellou (Chalmers University of Technology, Onsala, SE)


M. Huynh (University of Western Austalia, AU)


A. Iovino (INAF-OAB, Brera, IT)


N. Jerlin (University of Zagreb, HR)


Ch. Jones (H. S. Center for Astrophysics, Cambridge, US)


S. Lavoie (University of Victoria, CA)





A. Le Brun (Service d'Astrophysique CEA, Saclay, FR)


J.-P. Le Fevre (Service d'Informatique CEA, Saclay, FR)


M. Lieu (European Space Astronomy Center, Madrid, ES)


M. Kilbinger (Service d'Astrophysique CEA, Saclay, FR)


E. Koulouridis (Service d'Astrophysique CEA, Saclay, FR)


Ch. Lidman (Australian Astronomical Observatory, Epping, AU)


F. Marulli (University of Bologna, IT)


B. Maughan (University of Bristol, UK)


A. Mantz (University of Chicago, US)


S. Maurogordato (Observatoire de la Cote d'Azur, Nice, FR)


I. McCarthy (University of Liverpool, UK)


S. McGee (Leiden University, NL)


J.-B. Melin (Service de Physique des Particules CEA, Saclay, FR)


O. Melnyk  (University of Zagreb, HR)


L. Moscardini (University of Bologna, IT)


M. Novak (University of Zagreb, HR)


F. Pacaud (Argelander-Institut fur Astronomie, Bonn, DE)


S. Paltani (ISCD, Geneva Observatory, CH)


E. Piconcelli (INAF-OAR, Roma, IT)


M. Pierre (Service d'Astrophysique CEA, Saclay, FR)


M. Plionis (Aristotle University of Thessaloniki, Department of Physics, GR)


B. Poggianti (Observatory of Padova, IT)


D. Pomarede (Service d'Informatique CEA, Saclay, FR)


E. Pompei (European Southern Observatory, Garching, DE)


T. Ponman (University of Birmingham, UK)


M. E. Ramos Ceja (Argelander-Institut fur Astronomie, Bonn, DE)


P. Ranalli (University of Lund, SE)


D. Rapetti (Copenhagen University, DK)


S. Raychaudhury (University of Birmingham, UK)


T. Reiprich (Argelander-Institut fur Astronomie, Bonn, DE)


M. Ricci (Observatoire de la Cote d'Azur, Nice, FR)


H. Rottgering (Leiden Observatory, NL)


T. Sadibekova (Service d'Astrophysique CEA, Saclay, FR)


M. Sahlén (University of Oxford, UK)


J.-L. Sauvageot (Service d'Astrophysique CEA, Saclay, FR)


C. Schimd (Laboratoire d'Astrophysique, Marseille, FR)


M. Sereno (University of Bologna, IT)


G.P. Smith (University of Birmingham, UK)


V. Smolcic (University of Zagreb, HR)


S. Snowden (NASA, GSFC, US)


J. Surdej  (University of Liege, BE)


K. Umetsu (ASIAA, Taipei, TW)


P. Valageas (Institut de Physique Theorique du CEA, Saclay, FR)


A. Valotti (Service d'Astrophysique CEA, Saclay, FR)


I. Valtchanov (European Space Astronomy Center, Madrid, ES)


A. Veropalumbo (University of Bologna, IT)


C. Vignali (University of Bologna, IT)


J. Willis (University of Victoria, CA)


F. Ziparo (University of Birmingham, UK)





Last update : 09/20 2016 (3077)

- First series of XXL articles, Decemner 2015


- What are the XXL clusters (2012)?





- A century of X-ray cluster astronomy (1913-2013)








"Interactive Visualization of 3D Redshift Surveys with SDvision"

by D. Pomarède and M. Pierre


Published in the Proceedings of the IAU Symposium 277 Tracing the Ancestry of Galaxies

(on the land of our ancestors), 2010,Vol.6, Symposium S277, p.154,

Cambridge Journals, ed. C. Carignan, F. Combes, K.C. Freeman.




Visual comparison of the XMM-LSS and CFHTLS Surveys.

Click this picture to download the video (20.8Mb)


 The three-dimensional visualization of redshift surveys is a key player in the comprehension of the structuration of the cosmic web. The SDvision software package, intended primarily for the visualization of massive cosmological simulations, has been extended to provide an interactive visual representation of different classes of redshift surveys, with the objective to enable direct comparisons between the rare highest-density peaks traced by the clusters of galaxies found in the XMM-LSS Survey and the densely populated catalogues of galaxy photometric redshifts. We present the various possibilities offered by this tool in terms of filtering of the data, reconstruction of density fields, interactivity and visual rendering, including various techniques such as ray-casting, isosurfaces, slicing and texturing. This is illustrated using the C1 and C2 samples of the XMM-LSS Survey, and the publicly released COSMOS and CFHTLS photometric redshift Catalogs. Comparisons with published results are presented and discussed. (download pdf)













Last update : 01/08 2016 (3151)





Any scientist is welcome to enter the consortium in order to participate in the data analysis and science activities. Privileged access to the entire XXL data set will be granted to all consortium members.

For further information, contact the PI.







Last update : 04/30 2014 (3021)





XXL is an international project based around an XMM Very Large Programme surveying two 25 deg2 extragalactic fields at a depth of ~5 x 10-15 erg cm-2 s-1 in the [0.5-2] keV band for point-like sources.
The XXL website is http://irfu.cea.fr/xxl. Multi-band information and spectroscopic follow-up of the X-ray sources are obtained through a number of survey programmes, summarised at http://xxlmultiwave.pbworks.com/.

*** Append here any specific observatory acknowledgements (XMM, ESO, CFHT, etc.) pertaining to the data used in the paper in question, as well as acknowledgements to the relevant funding agencies. ***








Last update : 04/30 2014 (3289)

TEAM SITE (private)





  Wiki TEAM SITE (private)







Last update : 04/30 2014 (3036)


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