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Astron. Astrophys. 358, L1-L4 (2000)

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Letter to the Editor

A Search for clusters at high redshift

I. Candidate Ly[FORMULA] emitters near 1138-262 at [FORMULA]

J.D. Kurk 1, H.J.A. Röttgering 1, L. Pentericci 2, G.K. Miley 1, W. van Breugel 3, C.L. Carilli 4, H. Ford 5, T. Heckman 5, P. McCarthy 6 and A. Moorwood 7

1 Sterrewacht Leiden, P.O. Box 9513, 2300 RA, Leiden, The Netherlands
2 Max-Planck-Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany
3 Lawrence Livermore National Laboratory, P.O. Box 808, Livermore CA, 94550, USA
4 NRAO, P.O. Box 0, Socorro NM, 87801, USA
5 The Johns Hopkins University, Department of Physics & Astronomy, 3400 North Charles Street, Baltimore MD, 21218-2686, USA
6 The Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena CA, 91101, USA
7 European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748, Garching bei München, Germany

Received 15 March 2000 / Accepted 3 May 2000


Radio, optical and X-ray observations of the powerful radio galaxy PKS 1138-262 at [FORMULA] 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 1 in a broad band and a narrow band encompassing the redshifted Ly[FORMULA] emission. We detect 50 objects with rest equivalent width larger than 20 Å and a luminous, highly extended Ly[FORMULA] halo around 1138-262. If the radio galaxy is at the center of a forming cluster, as observations at other wavelengths suggest, these objects are candidate Ly[FORMULA] emitting cluster galaxies.

Key words: galaxies: active – galaxies: clusters: general – galaxies: evolution – galaxies: luminosity function, mass function – cosmology: observations – cosmology: early Universe

Send offprint requests to: J.D. Kurk (kurk@strw.leidenuniv.nl)

© European Southern Observatory (ESO) 2000

Online publication: June 26, 2000