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Infrared Imaging Surveyor (IRIS) is a satellite which will be launched at thebeginning of 2003. One of the main purposes of the IRIS mission is an all-skysurvey in the far-infrared region with a flux limit much deeper than that ofIRAS. Detection of a large number of galaxies ($\sim several \times 10^6$ inthe whole sky) is expected in this survey. We investigated the expected opticaland near-infrared (NIR) number counts of galaxies detected by the far-infraredscanner (FIS) of IRIS (hereafter, IRIS galaxies) and possibility of optical andNIR follow-up of them. The spectral energy distribution and the luminosityfunction of the IRIS galaxies are modeled based on the properties of galaxiesobserved by IRAS. The IRIS galaxies are divided into two populations accordingto their infrared luminosities ($L_{IR}$); normal spirals ($L_{IR}<10^{10}\LO$)and starbursts ($L_{IR}>10^{10}\LO$). The expected number counts of IRISgalaxies for both of the populations are calculated in $B$ and $H$ bands. Weshow that about 60 normal galaxies and about 80 starburst galaxies are detectedper square degree in both of the two bands, when galaxy evolution is not takeninto account. All of the normal population of IRIS galaxies are located at theredshift $z\ltsim 0.1$. As for the starburst population, we also calculatednumber of galaxies with a simple model of evolution. The total number ofstarburst population predicted by the evolution model is larger by 20% thanthat expected from the non-evolution model. In the evolution model, the numbersof low-z ($z<1$), intermediate-z ($1<z<3$), and high-z ($z>3$) galaxies are100, 20, and 0.2 per square degree, respectively.Comment: 18 pages LaTeX, 9 figures, to appear in PAS

Optical Number Count Estimation of IRIS Far-Infrared Survey of Galaxies