  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 x 10-14 cgs, 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.
