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Using all-sky maps obtained with COBE/DIRBE, we reanalyzed the diffuse skybrightness at 1.25 and 2.2 um, which consists of zodiacal light, diffuseGalactic light (DGL), integrated starlight (ISL), and isotropic emissionincluding the extragalactic background light. Our new analysis including animproved estimate of the DGL and the ISL with the 2MASS data showed thatdeviations of the isotropic emission from isotropy were less than 10% in theentire sky at high Galactic latitude (|b|>35). The result of our analysisrevealed a significantly large isotropic component at 1.25 and 2.2 um withintensities of 60.15 +/- 16.14 and 27.68 +/- 6.21 nWm-2sr-1, respectively. Thisintensity is larger than the integrated galaxy light, upper limits fromgamma-ray observation, and potential contribution from exotic sources (i.e.,Population III stars, intrahalo light, direct collapse black holes, and darkstars). We therefore conclude that the excess light may originate from thelocal universe; the Milky Way and/or the solar system.

Derivation of a large isotropic diffuse sky emission component at 1.25 and 2.2um from the COBE/DIRBE data