Using all-sky maps obtained with COBE /DIRBE , we reanalyzed the diffuse sky brightness at 1.25 and 2.2 \mu m , which consists of zodiacal light , diffuse Galactic light ( DGL ) , integrated starlight ( ISL ) , and isotropic emission including the extragalactic background light .
Our new analysis including an improved estimate of the DGL and the ISL with the 2MASS data showed that deviations of the isotropic emission from isotropy were less than 10 \% in the entire sky at high Galactic latitude ( | { \it b } | > 35 ^ { \circ } ) .
The result of our analysis revealed a significantly large isotropic component at 1.25 and 2.2 \mu m with intensities of 60.15 \pm 16.14 and 27.68 \pm 6.21 { nWm ^ { -2 } sr ^ { -1 } } , respectively .
This intensity is larger than the integrated galaxy light , upper limits from \gamma -ray observation , and potential contribution from exotic sources ( i.e. , Population III stars , intrahalo light , direct collapse black holes , and dark stars ) .
We therefore conclude that the excess light may originate from the local universe ; the Milky Way and/or the solar system .