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Issue A&A
Volume 424, Number 2, September III 2004
Page(s) L17 - L20
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200400041



A&A 424, L17-L20 (2004)
DOI: 10.1051/0004-6361:200400041

Letter

Discovery of six Ly $\alpha$ emitters near a radio galaxy at z ~ 5.2

B. P. Venemans1, H. J. A. Röttgering1, R. A. Overzier1, G. K. Miley1, C. De Breuck2, J. D. Kurk3, W. van Breugel4, C. L. Carilli5, H. Ford6, T. Heckman6, P. McCarthy7 and L. Pentericci8

1  Sterrewacht Leiden, PO Box 9513, 2300 RA, Leiden, The Netherlands
    e-mail: venemans@strw.leidenuniv.nl
2  European Southern Observatory, Karl Schwarzschild Straße 2, 85748 Garching, Germany
3  INAF Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi 5, 50125, Firenze, Italy
4  Lawrence Livermore National Laboratory, PO Box 808, Livermore CA, 94550, USA
5  National Radio Astronomy Observatory, PO Box 0, Socorro, NM 87801, USA
6  Dept. of Physics & Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore MD, 21218-2686, USA
7  The Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena CA, 91101, USA
8  Dipartimento di Fisica, Università degli studi Roma Tre, via della Vasca Navale 84, Roma, 00146, Italy

(Received 10 May 2004 / Accepted 17 July 2004)

Abstract
We present the results of narrow-band and broad-band imaging with the Very Large Telescope of the field surrounding the radio galaxy TN J0924-2201 at z = 5.2. Fourteen candidate Ly $\alpha$ emitters with a rest-frame equivalent width of >20 Å were detected. Spectroscopy of 8 of these objects showed that 6 have redshifts similar to that of the radio galaxy. The density of emitters at the redshift of the radio galaxy is estimated to be a factor 1.5-6.2 higher than in the field, and comparable to the density of Ly $\alpha$ emitters in radio galaxy protoclusters at z = 4.1, 3.1 and 2.2. The Ly $\alpha$ emitters near TN J0924-2201 could therefore be part of a structure that will evolve into a massive cluster. These observations confirm that substantial clustering of Ly $\alpha$ emitters occurs at z > 5 and support the idea that radio galaxies pinpoint high density regions in the early Universe.


Key words: galaxies: active -- galaxies: clusters: general -- galaxies: evolution -- cosmology: observations -- cosmology: early Universe

SIMBAD Objects



© ESO 2004


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