Astronomy and Astrophysics, volume 423, 75-85 (2004/8-3)
The XMM-LSS survey. First high redshift galaxy clusters: Relaxed and collapsing systems.
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 E., JEAN C. and SURDEJ J.
Abstract (from CDS):
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 σV=867+80–60km/s, XLSSC 002 at z=0.772 and σV=524+267–116km/s and XLSSC 003 at z=0.839 and σV=780+137–75km/s. These three clusters have X-ray bolometric luminosities LX∼1-3x1044erg/s and temperatures 2-4keV, and consequently are less massive than previously known clusters at similar redshifts, but nevertheless they follow the low redshift scaling relations between LX, T and σv, 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.
X-rays: galaxies: clusters - cosmology: large-scale structure of Universe - surveys
Table 1: XLSSC N (Nos 1-5), XLSSU JHHMMSS.s+DDMMSS N=5.
View the reference in ADS
To bookmark this query, right click on this link: simbad:2004A&A...423...75V and select 'bookmark this link' or equivalent in the popup menu