Measurements of Diffuse Sky Emission Components in High Galactic
  Latitudes at 3.5 and 4.9 um Using DIRBE and WISE Data
  Using all-sky maps obtained from COBE/DIRBE at 3.5 and 4.9 um, we present a
reanalysis of diffuse sky emissions such as zodiacal light (ZL), diffuse
Galactic light (DGL), integrated starlight (ISL), and isotropic residual
emission including the extragalactic background light (EBL). Our new analysis,
which includes an improved estimate of ISL using the Wide-field Infrared Survey
Explorer (WISE) data, enabled us to find the DGL signal in a direct linear
correlation between diffuse near-infrared and 100 um emission at high Galactic
latitudes (|b| > 35 degree). At 3.5um, the high-latitude DGL result is
comparable to the low-latitude value derived from the previous DIRBE analysis.
In comparison with models of the DGL spectrum assuming a size distribution of
dust grains composed of amorphous silicate, graphite, and polycyclic aromatic
hydrocarbon (PAH), the measured DGL values at 3.5 and 4.9 um constrain the mass
fraction of PAH particles in the total dust species to be more than ~ 2%. This
was consistent with the results of Spitzer/IRAC toward the lower Galactic
latitude regions. The derived residual emission of 8.9 +/- 3.4 nW m^{-2}
sr^{-1} at 3.5 um is marginally consistent with the level of integrated galaxy
light and the EBL constraints from the gamma-ray observations. The residual
emission at 4.9 um is not significantly detected due to the large uncertainty
in the ZL subtraction, same as previous studies. Combined with our reanalysis
of the DIRBE data at 1.25 and 2.2 um, the residual emission in the
near-infrared exhibits the Rayleigh-Jeans spectrum.
