Image Stacking Analysis of SDSS Galaxies with AKARI Far-Infrared
  Surveyor Maps at 65{\mu}m, 90{\mu}m, and 140{\mu}m
  We perform image stacking analysis of Sloan Digital Sky Survey (SDSS)
photometric galaxies over the AKARI Far-Infrared Surveyor (FIS) maps at
65{\mu}m, 90{\mu}m, and 140{\mu}m. The resulting image profiles are decomposed
into the central galaxy component (single term) and the nearby galaxy component
(clustering term), as a function of the r-band magnitude, m_r of the central
galaxy. We find that the mean far-infrared (FIR) flux of a galaxy with
magnitude m_r is well fitted with f^s_{90{\mu}m}=13*10^{0.306(18-m_r)}[mJy].
The FIR amplitude of the clustering term is consistent with that expected from
the angular-correlation function of the SDSS galaxies, but galaxy morphology
dependence needs to be taken into account for a more quantitative conclusion.
We also fit the spectral energy distribution of stacked galaxies at 65{\mu}m,
90{\mu}m, and 140{\mu}m, and derive a mean dust temperature of ~30K. This is
consistent with the typical dust temperature of galaxies that are FIR luminous
and individually detected.
