We report optical spectroscopic identifications of 10 hard ( 2–10 keV ) X-ray selected sources discovered by Chandra .
The X-ray flux of the sources ranges between 1.5 and 25 \times 10 ^ { -14 } { erg~ { } cm } ^ { -2 } ~ { } { s } ^ { -1 } , the lower value being 3 times fainter than in previous BeppoSAX and ASCA surveys .
Their R band magnitudes are in the range 12.8–22 .
Six of the Chandra sources are broad line quasars with redshifts between 0.42 and 1.19 , while the optical identification of the remaining four is quite varied : two are X-ray obscured , emission line AGN at z =0.272 and z =0.683 , one is a starburst galaxy at z =0.016 and one , most unusually , is an apparently normal galaxy at z =0.158 .
These findings confirm and extend down to fainter X–ray fluxes the BeppoSAX results , in providing samples with a wide range of X-ray and optical properties .

The ratio between the soft X-ray and the optical luminosity of the z =0.158 galaxy is a factor at least 30 higher than that of normal galaxies , and similar to those of AGN .
The high X–ray luminosity and the lack of optical emission lines suggest an AGN in which either continuum beaming dominates , or emission lines are obscured or not efficiently produced .