Infrared spectral energy distribution decomposition of WISE-selected,
  hyperluminous hot dust-obscured galaxies
  We utilize a Bayesian approach to fit the observed mid-IR-to-submm/mm
spectral energy distributions (SEDs) of 22 WISE-selected and submm-detected,
hyperluminous hot dust-obscured galaxies. By adopting the Torus+GB model, we
decompose the observed IR SEDs of Hot DOGs into torus and cold dust components.
The main results are: 1) Hot DOGs in our submm-detected sample are
hyperluminous, with torus emission dominating the IR energy output. However,
cold dust emission is non-negligible, averagely contributing ~24% of total IR
luminosity. 2) Compared to QSO and starburst SED templates, the median SED of
Hot DOGs shows the highest luminosity ratio between mid-IR and submm at
rest-frame, while it is very similar to that of QSOs at 10-50um suggesting that
the heating sources of Hot DOGs should be buried AGNs. 3) Hot DOGs have both
high dust temperatures ~73K and IR luminosity of cold dust. The T-L relation of
Hot DOGs suggests that the increase in IR luminosity for Hot DOGs is mostly due
to the increase of the dust temperature, rather than dust mass. Hot DOGs have
lower dust masses than those of submillimeter galaxies (SMGs) and QSOs within
the similar redshift range. Both high IR luminosity of cold dust and relatively
low dust mass in Hot DOGs can be expected by their relatively high dust
temperatures. 4) Hot DOGs have high dust covering factors, which deviate the
previously proposed trend of the dust covering factor decreasing with
increasing bolometric luminosity. Finally, we can reproduce the observed
properties in Hot DOGs by employing a physical model of galaxy evolution. The
result suggests that Hot DOGs may lie at or close to peaks of both star
formation and black hole growth histories, and represent a transit phase during
the evolution of massive galaxies, transforming from the dusty starburst
dominated phase to the optically bright QSO phase. (abridged)
