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We report observation of isotropic interplanetary dust (IPD) by analyzing theinfrared (IR) maps of Diffuse Infrared Background Experiment (DIRBE) onboardthe Cosmic Background Explorer (COBE) spacecraft. To search for the isotropicIPD, we perform new analysis in terms of solar elongation angle ($\epsilon$),because we expect zodiacal light (ZL) intensity from the isotropic IPD todecrease as a function of $\epsilon$. We use the DIRBE weekly-averaged mapscovering $64^\circ \lesssim \epsilon \lesssim 124^\circ$ and inspect the$\epsilon$-dependence of residual intensity after subtracting conventional ZLcomponents. We find the $\epsilon$-dependence of the residuals, indicating thepresence of the isotropic IPD. However, the mid-IR $\epsilon$-dependence isdifferent from that of the isotropic IPD model at $\epsilon \gtrsim 90^\circ$,where the residual intensity increases as a function of $\epsilon$. To explainthe observed $\epsilon$-dependence, we assume a spheroidal IPD cloud showinghigher density further away from the sun. We estimate intensity of the near-IRextragalactic background light (EBL) by subtracting the spheroidal component,assuming the spectral energy distribution from the residual brightness at$12\,{\rm \mu m}$. The EBL intensity is derived as $45_{-8}^{+11}$,$21_{-4}^{+3}$, and $15\pm3\,{\rm nWm^{-2}sr^{-1}}$ at $1.25$, $2.2$, and$3.5\,{\rm \mu m}$, respectively. The EBL is still a few times larger thanintegrated light of normal galaxies, suggesting existence of unaccountedextragalactic sources.

The isotropic interplanetary dust cloud and near-infrared extragalactic background light observed with COBE/DIRBE