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Search for clusters at high redshift - I. Candidate Lya emitters near 1138-262 at z=2.2

J. D. Kurk·H. J. A. Rottgering·L. Pentericci·G. K. Miley·W. van Breugel·C. L. Carilli·H. Ford·T. Heckman·P. McCarthy·A. Moorwood
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Abstract

Radio, optical and X-ray observations of the powerful radio galaxy PKS 1138-262 at z=2.156 have suggested that this galaxy is a massive galaxy in the center of a forming cluster. We have imaged 1138-262 and the surrounding 38 square arcminute field with the Very Large Telescope in a broad band and a narrow band encompassing the redshifted Lya emission. We detect 50 objects with rest equivalent width larger than 20 A and a luminous, highly extended Lya halo around 1138-262. If the radio galaxy is at the center of a forming cluster, these objects are candidate Lya emitting cluster galaxies.

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J. D. Kurk, H. J. A. Rottgering, L. Pentericci, G. K. Miley, W. van Breugel, C. L. Carilli, H. Ford, T. Heckman, P. McCarthy, A. Moorwood. 2000-05-03. Search for clusters at high redshift - I. Candidate Lya emitters near 1138-262 at z=2.2. https://arxiv.org/abs/astro-ph/0005058

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