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The XMM-LSS Survey. First high redshift galaxy clusters: relaxed and collapsing systems | I. Valtchanov
; M. Pierre
; J. Willis
; S. Dos Santos
; L. Jones
; S. Andreon
; C. Adami
; B. Altieri
; M. Bolzonella
; M. Bremer
; P.-A. Duc
; E. Gosset
; C. Jean
; J. Surdej
; | Date: |
12 May 2003 | Journal: | Astron.Astrophys. 423 (2004) 75 | Subject: | astro-ph | Abstract: | 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_V=867^{+80}_{-60} km/s, XLSSC 002 at z=0.772 and sigma_V=524^{+267}_{-116} km/s and XLSSC 003 at z=0.839 and sigma_V=780^{+137}_{-75} km/s. These three clusters have X-ray bolometric luminosities L_X sim 1-3 imes 10^{44} erg/s 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_V, within the limits of the measurement errors. One of the clusters, XLSSC 004, is detected independently as an overdensity 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. | Source: | arXiv, astro-ph/0305192 | Services: | Forum | Review | PDF | Favorites |
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