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

B. P. Venemans; H. J. A. Rottgering; R. A. Overzier; G. K. Miley; C. De Breuck; J. D. Kurk; W. van Breugel; C. L. Carilli; H. Ford; T. Heckman; P. McCarthy; L. Pentericci

doi:10.1051/0004-6361:200400041

arXiv · astro-ph/0408520

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

B. P. Venemans·H. J. A. Rottgering·R. A. Overzier·G. K. Miley·C. De Breuck·J. D. Kurk·W. van Breugel·C. L. Carilli·H. Ford·T. Heckman·P. McCarthy·L. Pentericci

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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 A 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.

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B. P. Venemans, H. J. A. Rottgering, R. A. Overzier, G. K. Miley, C. De Breuck, J. D. Kurk, W. van Breugel, C. L. Carilli, H. Ford, T. Heckman, P. McCarthy, L. Pentericci. 2004-08-27. Discovery of six Ly alpha emitters near a radio galaxy at z ~ 5.2. https://doi.org/10.1051/0004-6361%3A200400041

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