Astronomy and Astrophysics, volume 428, 793-815 (2004/12-4)
A search for clusters at high redshift. III. Candidate Hα emitters and EROs in the PKS 1138-262 proto-cluster at z=2.16.
KURK J.D., PENTERICCI L., ROETTGERING H.J.A. and MILEY G.K.
Abstract (from CDS):
In this paper we present deep VLT multi wavelength imaging observations of the field around the radio galaxy PKS 1138-262
aimed at detecting and studying a (potential) proto-cluster centered at this radio source. PKS 1138-262 is a massive galaxy at z=2.16, located in a dense environment as indicated by optical, X-ray and radio observations. We had already found an over-density of Lyα emitting galaxies in this field, consistent with a proto-cluster structure associated with the radio galaxy. In addition, we find 40 candidate Hα emitters that have nominal rest frame equivalent width >25Å within 1.8Mpc and 2000km/s of the radio galaxy. Furthermore, we find 44 objects with I-K>4.3. This number of extremely red objects (EROs) is about twice the number found in blank field ERO surveys, suggesting that some EROs in this field are part of the proto-cluster. The density of Hα emitters and extremely red objects increases towards the radio galaxy, indicating a physical association. From comparisons with other K band, ERO, Hα and Lyα surveys, we conclude that PKS 1138-262 is located in a density peak which will evolve into a cluster of galaxies.
galaxies: active - galaxies: clusters: general - galaxies: evolution - cosmology: observations - cosmology: early Universe
Table A1: [KPR2004] HA NNN N=40 among (Nos 5-477). Table A2: [KPR2004] LyA NNNN N=40 among (Nos 28-1017). Table A3: [KPR2004] ERO NNN N=44 among (Nos 53-531).
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