Number Counts of Bright Extremely Red Objects: Evolved Massive Galaxies at z 1

We present results on number counts of Extremely Red Objects (EROs) in a 2850 arcmin 2 near-infrared survey performed in European Large Area ISO Survey (ELAIS) fields at K 2 3L ⋆ massive galaxies at around z � 1, is estimated to be � 2 × 10 5 Mpc 3 , which is consistent with local values. Furthermore, the cumulative number counts at our bright magnitudes are remarkably well fitted by pure luminosity evolution models.