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C. Scarlata, M. Stiavelli, N. Panagia (STScI), T. Treu (Caltech), G. Bertin (Milano University ), F. Bertola (Padova Universidy )
We have carried out a search for Lyman alpha emission from galaxies at z~q2.4 over a field of 1200 sq. \arcmin using the CFH12K camera at the CFHT and a custom medium band filter. The search has uncovered 89 candidates. A subsample of 58 objects is likely to be uncontaminated by low redshift interlopers. The completeness-corrected source density is of ~0.07 sq. \arcmin-2. The sources have red colors (B-I~=1.8) and large EW, which imply either that a large fraction of the light is highly reddened and we are detecting Lyman alpha through special lines of sight, or that these objects contain an underlying older stellar population. We argue that most of the objects actually contain an older component.