Discovery of two infrared objects with strong ice absorption in the
  AKARI slit-less spectroscopic survey of the Galactic Plane
  We discover two infrared objects that show deep absorption features of H2O,
CO2, and CO ices in the AKARI/Infrared Camera (IRC) slit-less spectroscopic
survey of the Galactic plane in 2.5--13 micron. Both objects are located
neither in known star-forming regions nor in known dense clouds. For one of the
objects, Object 1, we successfully extract a spectrum from 2.5 to 13 micron,
which also shows several absorption features in 5--13 micron, including deep
silicate absorption at 10 micron. For the other object, Object 2, only a
spectrum from 3.1 to 5 micron is reliably extracted due to the presence of
nearby overlapping objects and faint nebulosity. Both objects show warm (>100
K) CO gas absorption in addition to the ice absorption features, suggesting
that they are embedded young stellar objects (YSOs). On the other hand, both
objects have spectral energy distributions (SEDs) that peak at around 5 micron
and decrease towards longer wavelengths. These characteristics of the SEDs and
the presence of deep absorption features cannot easily be accounted for by
standard YSO models. They may be explained as background stars behind dense
clouds. We discuss possible nature of the objects and implications of the
present discovery.
