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We discover two infrared objects that show deep absorption features of H2O,CO2, and CO ices in the AKARI/Infrared Camera (IRC) slit-less spectroscopicsurvey of the Galactic plane in 2.5--13 micron. Both objects are locatedneither in known star-forming regions nor in known dense clouds. For one of theobjects, Object 1, we successfully extract a spectrum from 2.5 to 13 micron,which also shows several absorption features in 5--13 micron, including deepsilicate absorption at 10 micron. For the other object, Object 2, only aspectrum from 3.1 to 5 micron is reliably extracted due to the presence ofnearby overlapping objects and faint nebulosity. Both objects show warm (>100K) CO gas absorption in addition to the ice absorption features, suggestingthat they are embedded young stellar objects (YSOs). On the other hand, bothobjects have spectral energy distributions (SEDs) that peak at around 5 micronand decrease towards longer wavelengths. These characteristics of the SEDs andthe presence of deep absorption features cannot easily be accounted for bystandard YSO models. They may be explained as background stars behind denseclouds. We discuss possible nature of the objects and implications of thepresent discovery.

Discovery of two infrared objects with strong ice absorption in the AKARI slit-less spectroscopic survey of the Galactic Plane