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Fig. 9


Observations with the SDSS telescope based on the CFHTLS photometry. Top row, left: ur vs. gi colored according to the photometric redshift. The selection applied is in the dashed box. Right: color selection projected in the ug vs. MG plane which shows our selection aims for the brightest and bluest objects. Middle row: RA, Dec in degrees (J2000). Left: g< 25 objects from the CFHT-LS W3 photometric redshift catalog. Right: targets observed spectroscopically. Bottom row, left: distribution of the redshifts observed. It is very efficient for selecting redshift 0.8 ELGs. Right: spectroscopic redshift and photometric redshift. The dashed lines represent the error contours at dz = 0.15(1 + z). The agreement is good.

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