Table 4: Fraction of Hard X-ray detected EROs.
K(lim) $F_{2-10~\rm keV}$(lim) area N(EROs) N(EROs) %
  erg cm-2 s-1 arcmin2 K-selected X-ray detected  
This work:          
18.8 $4 \times10^{-15}$ $\sim $380 173 6 3.5%
19.2 $4 \times10^{-15}$ $\sim $300 216 7 3.2%
all sample $4 \times10^{-15}$ $\sim $380 257 9 $3.5\pm1.2$%
A02$^{\dag }$:          
20.1 $2\times10^{-16}$ $\sim $70 29$^\ddag $ 4 14 +11-7%
R03$^{\dag }$:          
21.5 $4\times10^{-16}$ $\sim $50 179 12 6.6 2.0-1.8%
$^{\dag }$: AO2: Alexander et al. (2002); R03: Roche et al. (2003).
$^\ddag $: Selected on the basis of a I-K>4 criterion.

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Article Contents
1 Introduction
2 Multiwavelength data and X-ray source identification
3 Fractions of X-ray detected EROs and of EROs among hard X-ray sources
4 Multiwavelength properties of AGN EROs
5 X-ray properties of AGN EROs
6 Summary
References
List of tables
List of figures