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Using all-sky maps obtained from COBE/DIRBE at 3.5 and 4.9 um, we present areanalysis of diffuse sky emissions such as zodiacal light (ZL), diffuseGalactic light (DGL), integrated starlight (ISL), and isotropic residualemission including the extragalactic background light (EBL). Our new analysis,which includes an improved estimate of ISL using the Wide-field Infrared SurveyExplorer (WISE) data, enabled us to find the DGL signal in a direct linearcorrelation between diffuse near-infrared and 100 um emission at high Galacticlatitudes (|b| > 35 degree). At 3.5um, the high-latitude DGL result iscomparable to the low-latitude value derived from the previous DIRBE analysis.In comparison with models of the DGL spectrum assuming a size distribution ofdust grains composed of amorphous silicate, graphite, and polycyclic aromatichydrocarbon (PAH), the measured DGL values at 3.5 and 4.9 um constrain the massfraction of PAH particles in the total dust species to be more than ~ 2%. Thiswas consistent with the results of Spitzer/IRAC toward the lower Galacticlatitude 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 galaxylight and the EBL constraints from the gamma-ray observations. The residualemission at 4.9 um is not significantly detected due to the large uncertaintyin the ZL subtraction, same as previous studies. Combined with our reanalysisof the DIRBE data at 1.25 and 2.2 um, the residual emission in thenear-infrared exhibits the Rayleigh-Jeans spectrum.

Measurements of Diffuse Sky Emission Components in High Galactic Latitudes at 3.5 and 4.9 um Using DIRBE and WISE Data