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20 April 2024 |
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The Massive Galaxy Cluster XMMU J1230.3+1339 at z ~ 1: Colour-magnitude relation, Butcher-Oemler effect, X-ray and weak lensing mass estimates | | M. Lerchster
; S. Seitz
; F. Brimioulle
; R. Fassbender
; M. Rovilos
; H. Böhringer
; D. Pierini
; M. Kilbinger
; A. Finoguenov
; H. Quintana
; R. Bender
; | | Date: |
20 Sep 2010 | | Abstract: | We present results from the multi-wavelength study of XMMU J1230.3+1339 at z
~ 1. We analyze deep multi-band wide-field images from the Large Binocular
Telescope, multi-object spectroscopy observations from VLT, as well as
space-based serendipitous observations, from the GALEX and Chandra X-ray
observatories. We apply a Bayesian photometric redshift code to derive the
redshifts using the FUV, NUV and the deep U, B, V, r, i, z data. We achieve an
accuracy of $ riangle z/(1+z)$ = 0.07 (0.04) and the fraction of catastrophic
outliers is $eta$ = 13 (0)%, when using all (secure) spectroscopic data,
respectively. The i - z against z colour-magnitude relation of the photo-z
members shows a tight red-sequence with a zero point of 0.935 mag, and slope
equal to -0.027. We observe evidence for a truncation at the faint end of the
red-cluster-sequence and the Butcher-Oemler effect, finding a fraction of blue
galaxies $f_b approx$ 0.5. Further we conduct a weak lensing analysis of the
deep 26’ $ imes$ 26’ r-band LBC image. The observed shear is fitted with a
Single-Isothermal-Sphere and a Navarro-Frenk-White model to obtain the velocity
dispersion and the model parameters, respectively. Our best fit values are, for
the velocity dispersion $sigma_{SIS}$ = 1308 $pm$ 284, concentration
parameter c = 4.0$^{+14}_{-2}$ and scale radius r$_{s}$ = 345$^{+50}_{-57}$
kpc. Combining our mass estimates from the kinematic, X-ray and weak lensing
analyses we obtain a total cluster mass of $M^{tot}_{200}$ = (4.56 $pm$ 2.3)
$ imes$ 10$^{14}$ M$_{sun}$. This study demonstrates the feasibility of
ground based weak lensing measurements of galaxy clusters up to z ~ 1. | | Source: | arXiv, 1009.3930 | | Services: | Forum | Review | PDF | Favorites | |
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