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

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

2000-05-03

arxiv.org/abs/astro-ph/0005058v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A as Letter, 4 pages, 4 figures

Scientific paper

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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