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Issue A&A
Volume 474, Number 1, October IV 2007
Page(s) L5 - L8
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20078063



A&A 474, L5-L8 (2007)
DOI: 10.1051/0004-6361:20078063

Letter

Distant galaxy clusters in the COSMOS field found by HIROCS

M. Zatloukal1, H.-J. Röser1, C. Wolf2, H. Hippelein1, and S. Falter3

1  Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
    e-mail: Zatloukal@mpia.de
2  University of Oxford, Department of physics, Denys Wilkinson Bldg., Keble Road, Oxford OX1 3RH, UK
3  I. Physikalisches Institut, Universität zu Köln, Zülpicherstr. 77, 50937 Köln, Germany

(Received 12 June 2007 / Accepted 24 August 2007)

Abstract
We present the first high-redshift gal axy cluster candidate sample from the HIROCS survey found in the COSMOS field. It results from a combination of public COSMOS with proprietary H-band data on a 0.66$\square$° part of the COSMOS field and comprises 12 candidates in the redshift range 1.23 $\le$ z $\le$ 1.55. We find an increasing fraction of blue cluster members with increasing redshift. Many of the blue and even some of the reddest member galaxies exhibit disturbed morphologies as well as signs of interaction.


Key words: surveys -- galaxies: clusters: general -- galaxies: high-redshift -- galaxies: photometry



© ESO 2007

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