Table 5: Properties of the samples of H$\alpha $ candidates.
EW0 $\Sigma $ $m_{\rm NB}$ # #H n1138 n
(1) (2) (3) (4) (5) (6) (7)
50 3 - 17 2 $1.4\pm0.3$  
25 3 - 23 3 $1.8\pm0.4$  
25 2 - 40 3 $3.2\pm0.5$  
50 1 - 48 2 $ 3.8\pm0.6$  
25 1 - 60 3 $4.8\pm0.6$  
75 2 19.3 1 0 $0.1\pm0.1$ $0.61\pm0.35^a$
100 3 19.5 2 1 $0.2\pm0.1$ $0.12\pm0.05^b$
Notes: (1) Rest frame equivalent width lower limit; (2) signal to noise lower limit as defined by Bunker et al. (1995); (3) additional selection criterion: narrow band magnitude upper limit; (4) number of candidates in 12.5 arcmin2 area; (5) number of candidates within the radio galaxy Ly$\alpha $ halo; (6) surface density of candidates in the field of 1138-262 (arcmin-2); (7) surface density in other fields: a Bunker et al. (1995), b van der Werf et al. (2000).

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