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

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

2004-08-27

arxiv.org/abs/astro-ph/0408520v1

Astron.Astrophys. 424 (2004) L17-L20

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, published in A&A Letters

Scientific paper

10.1051/0004-6361:200400041

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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