HAWK-I imaging of the X-ray luminous galaxy cluster XMMU J2235.3-2557: The red sequence at z=1.39

Abstract

We use HAWK-I, the recently-commissioned near-IR imager on Yepun (VLT-UT4), to obtain wide-field, high-resolution images of the X-ray luminous galaxy cluster XMMU J2235.3-2557 in the J and Ks bands, and we use these images to build a colour-magnitude diagram of cluster galaxies. Galaxies in the core of the cluster form a tight red sequence with a mean J-Ks colour of 1.9 (Vega system). The intrinsic scatter in the colour of galaxies that lie on the red sequence is similar to that measured for galaxies on the red sequence of the Coma cluster. The slope and location of the red sequence can be modelled by passively evolving the red sequence of the Coma cluster backwards in time. Using simple stellar population (SSP) models, we find that galaxies in the core of XMMU J2235.3-2557 are, even at z=1.39, already 3 Gyr old, corresponding to a formation redshift of z ~ 4. Outside the core, the intrinsic scatter and the fraction of galaxies actively forming stars increase substantially. Using SSP models, we find that most of these galaxies will join the red sequence within 1.5 Gyr. The contrast between galaxies in the cluster core and galaxies in the cluster outskirts indicates that the red sequence of XMMU J2235.3-2557 is being built from the dense cluster core outwards.

9 pages, 2 figures. To appear in A&A

References in corpus (10)

• Ages and metallicities of early-type galaxies in the SDSS: new insight into the physical origin of the colour-magnitude and the Mg2-sigmaV relations
• The build-up of the colour-magnitude relation in galaxy clusters since z~0.8
• The First Appearance of the Red Sequence of Galaxies in Proto-Clusters at 2<~z<~3
• The XMM Cluster Survey: A Massive Galaxy Cluster at z=1.45
• The history of mass assembly of faint red galaxies in 28 galaxy clusters since z=1.3
• The Red-Sequence Luminosity Function in Galaxy Clusters since z~1
• Multiaperture $UBVRIzJHK$ Photometry of Galaxies in the Coma Cluster
• The Build-up of the Red Sequence in the galaxy cluster MS1054-0321 at z=0.831
• A Deficit of Faint Red Galaxies in the Possible Large-Scale Structures around the RDCS J1252.9-2927 Cluster at z=1.24
• The Formation Epoch of Early-Type Galaxies in the z ~ 0.9 CL1604 Supercluster

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