  Deep hard X-ray and near infrared observations of a type-2 radio-quiet QSO
candidate at z=0.9, AXJ08494+4454, are reported. The 0.5-10keV Chandra X-ray
Observatory spectrum of AXJ08494+4454 is hard, and is explained well with a
power-law continuum absorbed by a hydrogen column density of 2x10^23 cm^-2. The
2-10keV luminosity of the object reaches hard X-ray luminosity of QSOs. The
large X-ray absorption and the large intrinsic luminosity support the original
identification of AXJ08494+4454 as a type-2 radio-quiet QSO. Nevertheless, the
deep Subaru/IRCS J-band spectroscopic observation suggests the presence of a
strong broad H-alpha emission line from AXJ08494+4454. If real, the broad
H-alpha emission line has a velocity width of 9400+-1000 km/s, which
corresponds to a typical broad-Balmer line velocity width of a luminous QSO.
The existence of the strong broad H-alpha line means that the object is not a
type-2 QSO, but a luminous cousin of a Seyfert 1.9 galaxy in the source-frame
optical spectrum. The Balmer decrement of broad lines, and the broad H-alpha
emission to the hard X-ray luminosity ratio suggest that the nucleus is
affected by dust extinction with A_V of 1-3 mag in the optical wavelength. The
estimated amount of dust extinction is much smaller than that expected from the
X-ray column density.
