Reference : The XMM-LSS survey - First high redshift galaxy clusters: Relaxed and collapsing systems
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/17328
The XMM-LSS survey - First high redshift galaxy clusters: Relaxed and collapsing systems
English
Valtchanov, I. [> > > >]
Pierre, M. [> > > >]
Willis, J. [> > > >]
Dos Santos, S. [> > > >]
Jones, L. [> > > >]
Andreon, S. [> > > >]
Adami, C. [> > > >]
Altieri, B. [> > > >]
Bolzonella, M. [> > > >]
Bremer, M. [> > > >]
Duc, P. A. [> > > >]
Gosset, Eric mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
Jean, C. [> > > >]
Surdej, Jean mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Aug-2004
Astronomy and Astrophysics
EDP Sciences
423
1
75-85
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] X-rays : galaxies : clusters ; cosmology : large-scale structure of Universe ; surveys
[en] We present five newly found galaxy clusters at z > 0.6 from the XMM Large-Scale Structure Survey (XMM-LSS). All five objects are extended X-ray sources in the XMM images. For three of them we have sufficient spectroscopically confirmed member galaxies that an estimate of the velocity dispersion is possible: XLSSC 001 at z = 0.613 and sigma(nu) = 867(-60)(+80) km s(-1), XLSSC 002 at z = 0.772 and sigma(nu) = 524(-116)(+267) km s(-1) and XLSSC 003 at z = 0.839 and sigma(V) = 780(-75)(+137) km s(-1). These three clusters have X-ray bolometric luminosities L-X similar to 1-3 x 10(44) erg s(-1) and temperatures 2-4 keV, and consequently are less massive than previously known clusters at similar redshifts, but nevertheless they follow the low redshift scaling relations between L-X, T and sigma(upsilon), within the limits of the measurement errors. One of the clusters, XLSSC 004, is detected independently as an over-density of galaxies of a colour R - z' = 1.4 that matches the redshift of the central galaxy z = 0.87, although it cannot unambiguously be confirmed by the spectroscopic observations alone. The highest redshift candidate cluster pertaining to this paper, XLSSC 005, is most likely a double cluster complex at a redshift around unity, associated with an extended X-ray source with probable substructure.
http://hdl.handle.net/2268/17328
The authors thank EDP Sciences for their deposit authorization

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